Inventors list

Assignees list

Classification tree browser

Top 100 Inventors

Top 100 Assignees


Pumping

Subclass of:

359 - Optical: systems and elements

359333000 - OPTICAL AMPLIFIER

359341100 - Optical fiber

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
359341330 With multiple systems 5
20090201576OPTICAL FIBER AMPLIFIER AND A CONTROL METHOD THEREFOR - A fiber amplifier having two erbium doped fiber coils and a pump laser diode optically coupled, through a fiber array, to a planar lightwave circuit, is described. A photodetector array, a multiport free-space optical isolator, and a strip of thin-film gain flattening filter are attached to a side surface of the planar lightwave circuit, which has a tunable optical power splitter for variably splitting the optical pump power for the laser diode between the two erbium doped fiber coils, and variable tilters for correcting the gain tilt of the amplifier. The variable splitter and the tilters are thermally tunable Mach-Zehnder interferometers.08-13-2009
20090279166MULTI-STAGE LONG-BAND OPTICAL AMPLIFIER WITH ASE RE-USE - There is provided a long-band rare-earth-doped optical amplifier and method for amplifying an optical signal. The optical amplifier has a pre-, a mid- and a post-amplification stage. Only the mid-amplification stage is pumped with a pump light source. The other two are pumped using Amplified Spontaneous Emission (ASE) generated in the mid-amplification stage. An optical coupling device is used to couple the three amplification stages together and to split the ASE generated in the mid-amplification stage and available at one end of the mid-amplification stage. One part of the split ASE is used to pump the pre-amplification stage while the other part is used to pump the post-amplification stage.11-12-2009
20110255153Cladding-Pumped Optical Amplifier Having Reduced Susceptibility to Spurious Lasing - An optical amplifier comprises at least two gain regions, an intermediate region situated between the gain regions, and a transition region situated between the intermediate region and each gain region. The aforesaid regions have claddings that collectively form a path for pump radiation propagating from at least one of the gain regions to the other gain region, and cores that collectively form a path for signal radiation propagating from at least one of the gain regions to the other gain region. The cores in the gain regions support multiple propagating optical modes, including at least one signal mode and at least one non-signal mode. The intermediate region, however, supports fewer propagating core modes than are supported by the gain regions. The transition regions are conformed such that when radiation in propagating non-signal core modes passes from the gain regions into the intermediate region, it is at least partly coupled into cladding modes of the intermediate region.10-20-2011
20110085231RECONFIGURABLE OPTICAL AMPLIFIER - A reconfigurable optical amplifier is formed of a plurality of optical switches and a plurality of fiber amplifier sections to provide a switchable amplifying network. A variable pump splitter provides pump light from an optical pump source to two or more fiber amplifier sections. The optical switches and variable pump splitters are formed in a planar lightwave circuit, which may further include pump WDM combiners, variable optical attenuators, tap couplers and other optical components, and to which monitoring photodiodes and the fiber amplifier sections are coupled. A same PLC can be used for a wide variety of reconfigurable optical amplifiers.04-14-2011
20100315702OPTICAL TRANSMISSION APPARATUS AND OPTICAL SIGNAL LEVEL CHECKING METHOD - An optical transmission node including an optical preamplifier to amplify input light and an optical postamplifier to amplify light output from the optical preamplifier, includes the optical postamplifier configured to generate amplified spontaneous emission light without signals input, the optical preamplifier configured to amplify the amplified spontaneous emission light from the optical postamplifier, a loopback switch configured to discouple a path of the light output from the optical preamplifier to the optical postamplifier, and couple a path of the light output from the optical postamplifier to the optical preamplifier.12-16-2010
359341320 Radiation routing 5
20080304138Optical Amplifier Comprising a Pump Module - In one aspect, an optical amplifier including a pump module, preferably for amplifying channels of a WDM-signal is provided. The outlet thereof is connected to an amplifying fibre wherein signal radiation formed by optical signals is amplified. In order to amplify the optical signals with minimum gain spectrum difference, i.e. in the WDM-technique with minimal channel level differences, pump radiation emerging from the pump module has a mode field diameter in the amplification fibre which is selected so that it is smaller than a mode field diameter of the signal radiation.12-11-2008
20090201575HIGH POWER PARALLEL FIBER ARRAYS - High power parallel fiber arrays for the amplification of high peak power pulses are described. Fiber arrays based on individual fiber amplifiers as well as fiber arrays based on multi-core fibers can be implemented. The optical phase between the individual fiber amplifier elements of the fiber array is measured and controlled using a variety of phase detection and compensation techniques. High power fiber array amplifiers can be used for EUV and X-ray generation as well as pumping of parametric amplifiers.08-13-2009
20100195195System and method for combining multiple fiber amplifiers or multiple fiber lasers - A system for combining multiple fiber amplifiers, or multiple fiber amplifiers. The system includes a fiber combiner with multiple cores for connecting with the multiple fiber amplifiers and for combining the beams of the fiber amplifiers into a single beam. The fiber amplifiers are aligned, tapered, and stretched.08-05-2010
20120268808Optical Source with Remote Optical Head Outputting High Power Short Optical Pulses - An optical source can include a remote optical head for outputting high power short optical pulses. The optical source can include signal source operable to output short optical pulses; an optical pump light source; an optical head provided at a location remote from the location of the optical signal source; and an optical fibre amplifier having at least its optical output located within the optical head. The source can also include an optical signal delivery fibre arranged to deliver optical pulses from the optical signal source to the optical fibre amplifier and a pump light delivery fibre arranged to deliver optical pump light to the high power optical fibre amplifier. In use short optical pulses of a first optical power are delivered to the optical fibre amplifier and are amplified therein to a higher optical power for output from the optical head10-25-2012
20130114130OPTICAL FIBER AMPLIFIER ARRAY - Devices and techniques are disclosed for amplifying a plurality of optical signals using a single pump laser coupled to a set of optical splitters arranged in a binary tree configuration for powering a plurality of fiber optical amplifying path circuits (FOAP circuits) each configured to amplify one of the plurality of optical signals, where each of the optical splitters at the leaves of the binary tree is coupled to one of the plurality of FOAP circuits to provide the power required to amplify the optical signal.05-09-2013
359341310 Operating frequency 4
20100157419High Power Short Optical Pulse Source - The invention is directed to a high power short optical pulse source 06-24-2010
20100046067MODULAR, HIGH ENERGY, WIDELY-TUNABLE ULTRAFAST FIBER SOURCE - A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Peak power handling capability of the fiber amplifiers is expanded by using optimized pulse shapes, as well as dispersively broadened pulses. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth limit by the implementation of another set of dispersive delay lines. To ensure a wide tunability of the whole system, Raman-shifting of the compact sources of ultrashort pulses in conjunction with frequency-conversion in nonlinear optical crystals can be implemented, or an Anti-Stokes fiber in conjunction with fiber amplifiers and Raman-shifters are used. A particularly compact implementation of the whole system uses fiber oscillators in conjunction with fiber amplifiers. Additionally, long, distributed, positive dispersion optical amplifiers are used to improve transmission characteristics of an optical communication system. Finally, an optical communication system utilizes a Raman amplifier fiber pumped by a train of Raman-shifted, wavelength-tunable pump pulses, to thereby amplify an optical signal which counterpropogates within the Raman amplifier fiber with respect to the pump pulses.02-25-2010
20090201574OPTICAL AMPLIFICATION MODULE AND LASER LIGHT SOURCE DESIGNED TO SUPPRESS PHOTODARKENING - The present invention relates to an optical amplification module having a construction which effectively suppresses photodarkening, and to a laser light source including the same. The laser light source comprises a light source for outputting light to be amplified, and an optical amplification module. The optical amplification module comprises two types of optical amplification media having different rare earth element concentrations, and a pumping light source. The low concentration medium and the high concentration medium are disposed in the propagation direction of pumping light such that the population inversion of the low concentration medium is higher than that of the high concentration medium. Hence, by arranging two types of optical amplification media with different rare earth concentrations such that the population inversion of the low concentration medium is higher than that of the high concentration medium, sufficient overall gain of the laser light source can be obtained while effectively suppressing photodarkening in the two types of optical amplification media.08-13-2009
20120320451LARGE MODE AREA OPTICAL WAVEGUIDE DEVICES - A very large more area active double clad optical waveguide doped with Nd12-20-2012
Entries
DocumentTitleDate
20080285118METHOD AND APPARATUS FOR CONTROLLING AND PROTECTING PULSED HIGH POWER FIBER AMPLIFIER SYSTEMS - An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber amplifier system so that the amplified output pulses have predetermined pulse energy as the pulse width and repetition rate of the oscillator are varied. This includes keeping the pulse energy constant when the pulse train is turned on. The circuitry is also used to control the temperature of the high power fiber amplifier pump diode such that the wavelength of the pump diode is held at the optimum absorption wavelength of the fiber amplifier as the diode current is varied. The circuitry also provides a means of protecting the high power fiber amplifier from damage due to a loss of signal from the pulse source or from a pulse-source signal of insufficient injection energy.11-20-2008
20120162749OPTICAL PULSE TRANSMITTER - It is disclosed a method for driving a laser diode such as to enable mitigation or elimination of so called spiking effects related to the number of injected carriers in the laser overshooting the equilibrium value at the beginning of the lasing process. In this manner, among other things, the efficiency of a master oscillator power amplifier that may be utilized in range finding applications will be improved. It is further disclosed an optical pulse transmitter comprising such a laser diode.06-28-2012
20090122392OPTICAL FIBER AMPLIFIER SYSTEM AND METHOD - An optical fiber amplifier system is described and comprises a first optical fiber having a doped core with a first gain spectral profile upon being pumped. The first optical fiber is adapted to receive an optical signal from a light source. A second optical fiber has a doped core with a second gain spectral profile upon being pumped. The second optical fiber is optically coupled to the first optical fiber. A continuous wave pump light system is optically coupled to the fibers so as to store energy in the fibers for a subsequent amplification of the optical signal from the light source. An overlapping configuration is provided between the first gain spectral profile and the second gain spectral profile so as to reduce energy depletion in one of the optical fibers from amplification of spontaneous emission generated by another of the optical fibers.05-14-2009
20100157418GLASS LARGE-CORE OPTICAL FIBERS - Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n06-24-2010
20130033742VERY HIGH POWER PULSED FIBER LASER - A pulsed fiber laser including fiber preamplifier and power amplifier stages is disclosed. A fiber preamplifier includes first and second preamplifier stages that receive and amplify a seed pulse. A filter isolator placed between the preamplifier stages suppresses noise from the first preamplifier stage. An acoustic optical modulator located in the second preamplifier stage eliminates unwanted wavelengths from the amplified seed pulse received from the first preamplifier stage. The pulsed fiber laser is rugged and lightweight.02-07-2013
20100110535LASER SYSTEMS WITH DOPED FIBER COMPONENTS - A laser amplifier includes a pump source and an optically active fiber having an input portion configured to receive a signal source and an output portion. The pump source is optically coupled to the optically active fiber. The laser amplifier also includes an output fiber optically coupled to the output portion of the optically active fiber. The output fiber includes a rare-earth element. The laser amplifier further includes a beam expansion section joined to the output fiber.05-06-2010
20120262781HYBRID LASER AMPLIFIER SYSTEM INCLUDING ACTIVE TAPER - Hybrid laser systems include fiber amplifiers using tapered waveguides and solid-state amplifiers. Typically, such systems represent a technically simple and low cost approach to high peak power pulsed laser systems. The tapered waveguides generally are provided with an active dopant such as a rare earth element that is pumped with one or more semiconductor lasers. The active waveguide taper is selected to taper from a single or few mode section to a multimode section. A seed beam in a fundamental mode is provided to a section of the waveguide taper associated with a smaller optical mode, and an amplified beam exits the waveguide taper at a section associated with a larger optical mode. The waveguide taper permits amplification to higher peak power values than comparable small mode area fibers. The fiber amplified beam is then directed to a solid state amplifier, such as a thin disk or rod-type laser amplifier.10-18-2012
20120182603OPTICAL FIBER AMPLIFIER WITH IMPROVED TRANSIENT PERFORMANCE - An optical amplifier with improved transient performance has two amplifier stages and a dispersion compensating fiber inserted between the amplifier stages. A control unit generates a pump control signal for a common pump source pumping both amplifier stages via a power splitter. The pump control signal has a feedforward component with a delayed reaction. A feedforward delay time is adjusted to minimize gain variations resulting from input power drops. In a preferred embodiment, the splitting ratio of the power splitter is adjustable to achieve, for instance, either optimum steady-state performance or optimum transient performance.07-19-2012
20120182602OPTICAL FIBER AMPLIFIER COMPRISING AN EMBEDDED FILTER AND A CONTROL METHOD WITH IMPROVED FEEDFORWARD CONTROL PERFORMACE - An optical amplifier with improved transient performance has two amplifier stages and a gain flattening filter-inserted between the amplifier stages. A control unit generates a pump control signal for a common pump source pumping both amplifier stages. The pump control signal has a feed-forward component and a feedback component. After a drop of channels the feed-forward control circuit is responsible for the transient performance and fast gain stabilization. The characteristic of the gain flattening filter is taken into account in calculating an optimum feed-forward control signal.07-19-2012
20130088771Systems And Methods For Amplifying Space-Multiplexed Optical Signals - In one embodiment, an optical system for amplifying space-multiplexed optical signals includes an input fiber that propagates multiple spatially-separated optical signals and a bulk amplifier formed of a doped material that receives the multiple spatially-separated optical signals and simultaneously amplifies those signals to generate multiple amplified signals.04-11-2013
20090303577Optical Amplifier Configuration - An optical amplifier configuration for WDM (wavelength division multiplex) systems uses a common pump source connected to an input of an optical splitter deploying pump light via variable optical attenuators to a plurality of optical amplifiers. Control circuits determine individually the output powers of the amplifiers by varying the attenuations of the variable optical attenuators. Amplifier units based on PLC technology are implemented to reduce the size.12-10-2009
20130163072MULTI-CORE OPTICAL FIBER, WAVELENGTH DIVISION MULTIPLEXING COUPLER, AND MULTI-CORE OPTICAL FIBER AMPLIFIER - The multi-core optical fiber amplifier according to an exemplary embodiment of the present invention having the above configuration includes: a double clad multi-core optical fiber including a plurality of cores, an internal cladding enclosing the plurality of cores, and an external cladding enclosing the internal cladding; a pumping light source outputting pumping light; an optical fiber to which pumping light from the pumping light source is input; and a wavelength division multiplexing coupler coupling the optical fiber with the double clad multi-core optical fiber to apply the pumping light input to the optical fiber from the pumping light source to the double clad multi-core optical fiber.06-27-2013
20090231686MULTI-FUNCTIONAL INTEGRATED OPTICAL WAVEGUIDES - This invention pertains to a device and method for making same. The device includes a substrate supporting optical waveguide, an overlay waveguide and a mode coupler for coupling between the substrate-supported and overlay waveguides. One embodiment includes a high-confinement overlay waveguide capable of low-loss bends with small bend radii, down to tens of microns, which represents two orders of magnitude improvement over prior art. One embodiment includes a feedback path enabled by the high-confinement waveguide, capable of implementing tunable ring resonator filters with free spectral ranges over 100 GHz and modulators with compact and interferometrically stable feedback paths. Another embodiment includes a periodically poled lithium niobate section capable of integrating wavelength conversion within a compact feedback path. Another embodiment includes an amplifier section, which may be incorporated in the feedback path. Thus, multi-functional integrated optical waveguides are disclosed that enable high-density integration of multiple linear and nonlinear optical processing functions.09-17-2009
20090231685OPTICAL AMPLIFIER FOR TUNING TRANSMISSION TIME OF OPTICAL SIGNAL - The present invention relates to a technique for tuning the transmission time of optical signal, which adopts an optical amplifier with a bending structure for enhancing the tunable time of optical signal. The effect of tunable time of optical signal can be achieved by adjusting the gain of the optical amplifier.09-17-2009
20090231684Optical fibre amplifier - An optical amplifier for amplifying an optical signal (09-17-2009
20110279891OPTICAL FIBER AMPLIFIER - An object of the present invention is to provide an optical fiber amplifier capable of suppressing oscillation of ASE. The optical fiber amplifier includes a second amplifier fiber 11-17-2011
20110279890METHOD AND DEVICE FOR ILLUMINATING A SAMPLE IN A LASER MICROSCOPE - The invention relates to a method and a device for illuminating or irradiating an object, a sample (11-17-2011
20120287498Optical Source Implementing a Doped Fiber, Fiber for Such an Optical Source and Method for Manufacturing Such a Fiber - An optical source having a fiber emitting controlled single-transverse mode radiation at a wavelength of less than 1030 nm, includes at least one laser diode suitable for emitting a pumping wave; and a section of sheathed amplifying optical fiber having two ends, the amplifying optical fiber comprising a core and a pumping sheath, the fiber being doped with a rare earth dopant; a device for coupling the pumping source in the sheath of the doped fiber, characterized in that the core of the doped fiber includes a cylindrical portion doped with a rare earth element selected among ytterbium, neodymium, and thulium, in order to obtain a refractive index of the core that is higher than the refractive index of the sheath; the excitation wavelength of the laser diode is between 750 nm and 960 nm; the diameter of the sheath is greater than 50 microns, and the surface ratio of the doped core to the pumping sheath is between 8 and 50.11-15-2012
20120188632GLASS LARGE-CORE OPTICAL FIBERS - Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n07-26-2012
20120105947AMPLIFICATION OPTICAL FIBER AND OPTICAL FIBER AMPLIFIER AND RESONATOR USING THE SAME - The invention provides an amplification optical fiber, which can output light with a good beam quality even when a higher-order mode is excited, and an optical fiber amplifier using the amplification optical fiber.05-03-2012
20110292500OPTICAL AMPLIFIER AND OPTICAL FIBER - An optical amplifier includes an optical fiber which includes a core in which the signal light is propagated and with which a rare-earth element is doped; a laser that is optically coupled to an end of the optical fiber, providing the optical fiber with an excitation light; and a filter which is formed in the optical fiber and removes a light within a wavelength range, from the core, among lights propagated in the core, wherein the filter comprises a first filter that is arranged at a stage of the optical fiber and removes a first light in a first wavelength range, and a second filter that is arranged at a subsequent stage of the optical fiber and removes a second light in a second wavelength range, wherein a wavelength of the second light is longer than a wavelength of the first light.12-01-2011
20110292499High Power Fiber Laser System with Side-Pumping Arrangement - A twin fiber laser arrangement is configured with active and passive fibers supporting respective signal and pump lights and a reflective coating surrounding the fibers along a section of the arrangement. The passive fiber has regions covered by respective protective layer and coating-free regions alternating with the layer covered regions, wherein the reflective coating is configured to overlap the protective layer which shields the end of the reflective coating from high power pump light.12-01-2011
20110134511OFF AXIS WALK OFF MULTI-PASS AMPLIFIERS - The various laser architectures described herein provide increased gain of optical energy as well as compensation of optical phase distortions in a thin disk gain medium. An optical amplifier presented herein provides for scalable high energy extraction and gains based on a number of passes of the signal beam through a gain medium. Multiple, spatially separate, optical paths may also be passed through the same gain region to provide gain clearing by splitting off a small percentage of an output pulse and sending it back through the amplifier along a slightly different path. By clearing out the residual gain, uniform signal amplitudes can be obtained.06-09-2011
20110134512DOUBLE CLAD FIBER LASER DEVICE - Provided is a double clad fiber device. The double clad fiber device includes a double clad fiber, a pump combiner, at least one first laser diode, and at least one second laser diode. The double clad fiber includes a core and a clad. The pump combiner provides pump light to the core and the clad through one end of the double clad fiber, respectively. The at least one first laser diode provides first pump light to the clad through the pump combiner. The at least one second laser diode provides second pump light to the core through the pump combiner.06-09-2011
20100315700BROADBAND NEODYMIUM-YTTERBIUM-SILICA DOPED AMPLIFIED SPONTANEOUS EMISSION OPTICAL FIBER SOURCE BY SPECTRAL FILTERED REINJECTED SIGNALS - The present invention provides an amplified spontaneous emission fiber optic source having high optical power (>20 mW) and a spectral broadband emission (>70 nm) centered near a wavelength of 1060 nm. In an embodiment of the invention, the fiber source comprises a combination of Yb-doped and Nd-doped silica fibers in a dual-pumping configuration. The Yb-doped optical fiber has a peak absorption coefficient of 350 dB/nm at 977 nm band, and the Nd-doped fiber used has a dopant concentration of 500 ppm-wt in a glass host of aluminum-germano-phospho-silicate. A combination of these two doped-fibers along with optical spectral filtering provides a broadband spectrum giving coherence length <7 μm (in air), which is well suited for optical coherence imaging.12-16-2010
20100085632METHOD AND APPARATUS FOR PUMPING AND OPERATING OPTICAL PARAMETRIC OSCILLATORS USING DFB FIBER LASERS - An optical parametric oscillator (OPO) is described that efficiently converts a near-infrared laser beam to tunable mid-infrared wavelength output. In some embodiments, the OPO includes an optical resonator containing a nonlinear crystal, such as periodically-poled lithium niobate. The OPO is pumped by a continuous-wave fiber-laser source having a low-power oscillator and a high-power amplifier, or using just a power oscillator. The fiber oscillator produces a single-frequency output defined by a distributed-feedback (DFB) structure of the fiber. The DFB-fiber-laser output is amplified to a pump level consistent with exceeding an oscillation threshold in the OPO in which only one of two generated waves (“signal” and “idler”) is resonant within the optical cavity. This pump source provides the capability to tune the DFB fiber laser by straining the fiber (using an attached piezoelectric element or by other means) that allows the OPO to be continuously tuned over substantial ranges, enabling rapid, wide continuous tuning of the OPO output frequency or frequencies.04-08-2010
20110149383AMPLIFICATION OPTICAL FIBER, AND OPTICAL FIBER AMPLIFIER AND RESONATOR USING THE SAME - There are provided an amplification optical fiber, and an optical fiber amplifier and a resonator using the same capable of outputting light of high beam quality even when a higher-order mode that is axially symmetric is excited in addition to LP01 mode.06-23-2011
20120033293METHOD AND APPARATUS OF DETECTING AN OPENING IN AN OPTICAL TRANSMISSION FIBER OF A ROPA SYSTEM - Method and apparatus for detecting an opening in a transmission fiber connecting a discrete gain unit to a pump unit of a Remote Optically Pumped Amplifier (ROPA) system. The method comprises measuring an optical power entering the pump unit from the transmission fiber, the optical power being in a selected wavelength range, and establishing that the optical power lacks an ASE noise power component generated by the gain unit. The lack of this component indicates the presence of a break or opening in the transmission fiber, and triggers corrective action whereby pump lasers within the pump unit are shut down or have their power reduced to a safe level.02-09-2012
20090290212FREE-SPACE OPTICAL MODULE FOR OPTICAL AMPLIFICATION - An integrated optical-amplification module includes a housing member, a first input optical terminal configured to receive an optical signal, a second input, optical terminal that can receive a pump light, and an output optical terminal that can output a combined optical signal comprising at least a portion of the optical signal and a portion of the pump light. The integrated optical-amplification module also includes an optical combiner fixedly installed relative to the housing member. The optical combiner can receive the pump light and the optical signal and an optical prism fixedly installed relative to the housing member. The optical combiner can merge the pump light and the optical signal to form the combined optical signal. The optical prism can direct at least a portion of the optical signal through free space to the optical combiner.11-26-2009
20100265570Tuneable Optical Amplifier or Optical Parametric Oscillator - A parametric process for producing light at a second wavelength and a fourth wavelength including pumping an optical parametric oscillator with input light at a first wavelength of less than one micron, wherein said oscillator consists of an optical fibre having each end closed by a dichroic mirror.10-21-2010
20110007385OPTICAL FIBER FOR OPTICAL AMPLIFICATION, OPTICAL FIBER AMPLIFIER, AND OPTICAL FIBER LASER - An optical fiber for optical amplification has: a core portion doped with at least erbium and aluminum; a cladding portion formed around the core portion and having a refractive index smaller than that of the core portion; a peak value of absorption coefficient of 35 dB/m or greater at a wavelength around 1530 nanometers; normal dispersion characteristics and an effective core area of 20 μm01-13-2011
20090190207Optical signal processing apparatus, optical receiving apparatus, and optical relay apparatus - An optical signal processing apparatus includes an input unit to which signal light is input; a wave coupling unit that couples the signal light from the input unit and pump light having a waveform different from that of the signal light; a first nonlinear optical medium that transmits light coupled by the wave coupling unit, the light being the signal light and the pump light; a dispersion medium that transmits the light that has been transmitted through the first nonlinear optical medium; and a second nonlinear optical medium that transmits the light that has been transmitted through the dispersion medium.07-30-2009
20130215495NANOPARTICLE WAVEGUIDE APPARATUS, SYSTEM AND METHOD - A nanoparticle waveguide apparatus, a nanoparticle waveguide photonic system and a method of photonic transmission employ a nearfield-coupled nanoparticle (NCN) waveguide to cooperatively propagate an optical signal. The nanoparticle waveguide apparatus includes a first optical waveguide adjacent to a second optical waveguide, the first optical waveguide comprising an NCN waveguide having a plurality of nanoparticles. The nanoparticle waveguide photonic system further includes a nearfield coupling (NC) modulator. The method includes providing the NCN waveguides and modulating a coupling between one or both of first and second NCN waveguides and adjacent nanoparticles within one or both of the first and second NCN waveguides.08-22-2013
20110141555AUTO-CLADDED LARGE-CORE OPTICAL FIBERS - Embodiments of auto-cladded optical fibers are described. The fibers may have a refractive index profile having a small relative refractive index change. For example, the fiber may include an auto-cladded structure having, e.g., a trough or gradient in the refractive index profile. A beam of light propagating in the fiber may be guided, at least in part, with the auto-cladded structure. In some embodiments, the optical fiber may be all glass. In some embodiments, the optical fiber may include a large-core or an ultra large-core.06-16-2011
20090207484Fast power transient supression in constant power-mode controlled optical amplifiers - The specification describes an improved approach to suppressing fast transients in optical amplifier systems. The approach relies on operating the amplifier in an automatic power-mode control with an extra loss component. It is applicable to optical amplifiers based on rare earth amplifier media, such as erbium doped fiber amplifiers (EDFAs).08-20-2009
20090207485PHOTONIC BANDGAP FIBER - A photonic bandgap fiber includes a core and a cladding that surrounds the core. In this photonic bandgap fiber, high refractive index portions which have a refractive index higher than that of a medium of the cladding are provided in the cladding so as to form a triangular lattice structure with a lattice constant Λ, and the refractive index of the core is higher than the refractive index of the medium of the cladding and lower than the refractive index of the high refractive index portion. The coupling length between the core and the high refractive index portion that is closest to the core is longer than the coupling length between adjacent high refractive index portions, or a periodic structure formed by the high refractive index portions is not provided around the entirely of the area along the circumference of the core.08-20-2009
20090103171OPTICAL FIBER FOR AMPLIFICATION AND OPTICAL FIBER AMPLIFIER - Provided is an optical fiber for amplification and an optical fiber amplifier for use in L-band, in which optical fiber the increase of transmission loss and the degradation of hydrogen-resistant characteristic can be restrained. The optical fiber is basically made of silica glass and comprises: a core region doped with erbium and P element of 2 wt % to 5 wt % concentration, Ge not being added thereto; and a cladding region enclosing the core region and doped with F element, wherein the optical fiber has a gain at least in a wavelength range of 1570 to 1620 nm. The optical fiber amplifier comprises: the optical fiber; a pump light source for outputting the pump light capable of exciting a rare-earth element added to the core region of the optical fiber; and an optical coupler for introducing into the optical fiber the pump light having been output from the pump light source.04-23-2009
20090213455OPTICAL AMPLIFIER - An optical amplifier for amplifying light includes a light source for emitting pump light in accordance with current amount; a rear earth element doped optical fiber doped rear earth element, the rear earth element doped optical fiber pumped by the pump light from the light source; a detector for detecting upconversion light leaked from the rear earth element doped optical fiber; a memory for storing correspondence relationship data of the current amount for the light source and an intensity of the upconversion light in normal state of the light source; a difference calculator for calculating a difference between the intensity of the upconversion light being detected by the detector and a converted amount being converted the current amount for the light source by the use of the correspondence relationship data; and a discriminator for discriminating whether the difference calculated at the difference calculator exceeds a predetermined value.08-27-2009
20120105946COMPENSATION OF THERMALLY INDUCED REFRACTIVE INDEX DISTORTIONS IN AN OPTICAL GAIN MEDIUM OR OTHER OPTICAL ELEMENT - In various embodiments, an optical element, e.g., an optical fiber, may be configured to compensate for thermal lensing. For example, thermal lensing may be caused by light power dissipation within an optical fiber, which may include a fiber core that guides amplified light along the longitudinal dimension of the fiber core. Thermal lensing from a thermally induced change in material refractive index as a function of position along dimensions perpendicular to the fiber's longitudinal dimension may be at least partially compensated or offset when light is guided by the fiber core by a designed-in effective refractive index profile selected such that the designed-in material refractive index of the fiber core changes as a function of transverse position within the fiber core, or by selection of a favorable cross-sectional core shape in a plane perpendicular to the longitudinal dimension of the fiber core.05-03-2012
20090251770CLADDING PUMPED FIBRE LASER WITH A HIGH DEGREE OF PUMP ISOLATION - An optical fibre laser or amplifier device is disclosed, comprising: a rare-earth-doped multi-clad optical fibre having at least three cladding layers, one or more multimode pump laser diodes, and a means of multiplexing a laser signal and the pumping radiation, adapted so that a fraction of the stray signal light originating within the device is captured by one of the intermediate cladding layers of the rare-earth-doped fibre and guided out of the laser structure through the multiplexing system resulting in a reduction in the amount of stray signal radiation impinging upon the pump laser diodes.10-08-2009
20090257116Erbium and Erbium/Ytterbium Cladding Pumped Hybrid Optical Amplifier - An optical fiber amplifier apparatus and optical signal amplification method are provided. In one example, the amplifier apparatus comprises an optical combiner that is configured to receive an input optical signal to be amplified and a pump light beam. The optical combiner combines for output the input optical signal and the pump light beam. A first cladding pumped optical fiber in which Erbium is the only optically active dopant is coupled to the optical combiner to receive the pump light beam and the input optical signal. The first cladding pumped optical fiber pre-amplifies the input optical signal and passes the pre-amplified input optical signal and power of the pump light beam not absorbed by the first cladding pumped optical fiber. A second cladding pumped optical fiber is provided that is coupled to the first cladding pumped optical fiber. Erbium and Ytterbium are optically active dopants in the second cladding pumped optical fiber. The second cladding pumped optical fiber absorbs power of the pump light beam that was not absorbed by the first cladding pumped optical fiber to further amplify the pre-amplified input optical signal to produce an output amplified optical signal that is a desired amplified version of the input optical signal.10-15-2009
20100188736MODULAR FIBER-BASED CHIRPED PULSE AMPLIFICATION SYSTEM - A modular ultrafast pulse laser system is constructed of individually pre-tested components manufactured as modules. The individual modules include an oscillator, pre-amplifier and power amplifier stages, a non-linear amplifier, and a stretcher and compressor. The individual modules can typically be connected by means of simple fiber splices.07-29-2010
20100188735OPTICAL MODULE - The present invention relates to an optical module having a structure for reducing adverse contingencies such as increased number of fusion splicing points, drops in output, and higher costs associated with a greater number of optical components. The optical module comprises an amplification optical fiber, a transmission optical fiber, and a fusion splicing structure that fusion-splices the amplification optical fiber to the transmission optical fiber, in a state where a cover layer is removed at the tip portions, including the end faces, of these optical fibers. The fusion splicing structure includes a pumping light removing resin that covers directly the tip portions of the amplification optical fiber and the transmission optical fiber from which the cover layer is removed. The pumping light removing resin has a higher refractive index than a first cladding of the amplification optical fiber. The above configuration allows transmitted pumping light, for which the confinement effect by the first cladding of the amplification optical fiber is cancelled, to escape more efficiently out of the fusion splicing portion.07-29-2010
20100188734Multi-fibre arrangement for high power fibre lasers and amplifiers - An optical fibre arrangement has at least two optical fibre sections, each optical fibre section defining an outside longitudinally extending surface. The outside longitudinally extending surfaces are in optical contact with each other. The invention further provides for an amplifying optical device have an optical fibre arrangement as just described, and a pump source. The amplifying optical device is configured such that the pump source illuminates the amplifying optical fibre. A amplifying arrangement is also disclosed. The amplifying arrangement includes a plurality of amplifying optical devices as just described, and each amplifier also has at least one input fibre and a first multiplexer connected to the input fibre. Each amplifier is configured such that at least one of the amplifying optical fibres is connected to the first multiplexer. The amplifying arrangement also has a second multiplexer connected to each of the first multiplexers.07-29-2010
20110058250HIGH POWER FIBER AMPLIFIER WITH STABLE OUTPUT - A stable, single mode fiber amplifier is described. The amplifier consists of a seed source, a passive single clad multimode fiber, an active double clad multimode fiber or a multimode fiber horn and a semiconductor laser pump source. The passive fiber is packaged on a mandrel with a compound radius of curvature such that high order modes in the fiber are stripped from the core leaving only the fundamental mode. This fiber is then spliced to a multimode active fiber of similar core diameter. By exciting only the fundamental mode of this active fiber, stable single mode amplification is achieved.03-10-2011
20100245987SEMICONDUCTOR OPTICAL AMPLIFIER - It is desirable to provide a semiconductor optical amplifier from which it becomes able to obtain a higher output power. A semiconductor optical amplifier in comprises an active wave guiding layer which comprises a passive core region that is formed of a semiconductor, and active cladding regions that are located at both sides of the passive core region and each of that is comprised of an active layer which is formed of a semiconductor and which has an index of refraction to be lower than that of the passive core region, wherein a light is wave guided with being amplified in the active wave guiding layer. Moreover, it is desirable for the active wave guiding layer to be formed of a compound semiconductor, and to be formed by integrating the passive core region and the active cladding regions to be monolithic on to a substrate that is formed of a compound semiconductor by making use of a process of a butt joint growth.09-30-2010
20110235166Apparatus and Method of Generating Nearly Non-Diffracting Beams from Multimode Optical Fibers - A first optical fiber (09-29-2011
20090040599Optical Waveguide Amplifier Using High Quantum Efficiency Silicon Nanocrystal Embedded Silicon Oxide - A method is provided for optical amplification using a silicon (Si) nanocrystal embedded silicon oxide (SiOx) waveguide. The method provides a Si nanocrystal embedded SiOx waveguide, where x is less than 2, having a quantum efficiency of greater than 10%. An optical input signal is supplied to the Si nanocrystal embedded SiOx waveguide, having a first power at a first wavelength in the range of 700 to 950 nm. The Si nanocrystal embedded SiOx waveguide is pumped with an optical source having a second power at a second wavelength in a range of 250 to 550 nm. As a result, an optical output signal having a third power is generated, greater than the first power, at the first wavelength. In one aspect, the third power increases in response to the length of the waveguide strip.02-12-2009
20090185261OPTICAL AMPLIFICATION MODULE, OPTICAL AMPLIFIER, OPTICAL COMMUNICATION SYSTEM, AND WHITE LIGHT SOURCE - The present invention relates to an optical amplifier and the like having a flatter gain spectrum in the wavelength band of 1490 nm to 1520 nm than before. The optical amplifier according to the present invention comprises an Er-doped optical waveguide and a Tm-doped optical waveguide having gain spectra difference from each other in the wavelength band. The signal light entered through the input end is first amplified by the Er-doped optical waveguide, and thereafter is amplified by the Tm-doped optical waveguide. The gain deviation of the amplified signal light, which has been amplified in the Er- and Tm-doped optical waveguides and outputted through the output end, can be reduced over the wavelength band.07-23-2009
20100220387SUPERFLUORESCENT FIBER SOURCE WITH ENHANCED MEAN WAVELENGTH STABILITY - A doped superfluorescent fiber source (SFS) has an enhanced mean wavelength stability. A method stabilizes the mean wavelength of a SFS. The method includes pumping the SFS with pump light from a pump source having a wavelength dependent on the temperature of the pump source and dependent on the power of the pump light. The length of the fiber is selected to compromise between reduction of the dependence of the mean wavelength on the pump light power and reduction of the contribution of the forward amplified spantaneous emission light produced by the fiber to the output light.09-02-2010
20100220386CLADDING-PUMPED EVANESCENT GAIN OPTICAL FIBER - A cladding-pumped gain optical fiber is provided. The cladding-pumped gain optical fiber includes a core transmitting a signal light; a first cladding covering the core and having an optical-gain dopant; a second cladding covering the first cladding for transmitting a pumping light; and a third cladding covering the second cladding for reflecting the pumping light.09-02-2010
20100296157OPTICAL FIBER COUPLER AND OPTICAL FIBER AMPLIFIER - [Object] An optical fiber coupler in which damage to an pumping light source can be suppressed even if signal light leaks and an optical fiber amplifier using the optical fiber coupler are provided.11-25-2010
20110116160Rare-Earth-Doped Optical Fiber Having Small Numerical Aperture - The present invention embraces an amplifying optical fiber having a central core adapted to convey and amplify an optical signal and a cladding that surrounds the central core to confine the optical signal conveyed in the central core. The central core is formed of a core matrix in which nanoparticles are present. The nanoparticles themselves include a nanoparticle matrix and rare-earth-dopant elements. The core matrix may also include one or more additional dopants (i.e., in addition to nanoparticles). The amplifying optical fiber possesses a small numerical aperture and is suitable for use in high-pump-power applications without a degraded gain shape.05-19-2011
20120033294OPTICAL APPARATUS, SYSTEM AND METHOD EMPLOYING AN ENDOHEDRAL METALLOFULLERENE - An optical apparatus (02-09-2012
20110043898Adiabatic bend transitions for multimode fibers - Guided adiabatic bend transitions for multimode fibers are presented to preserve the power of guided light in the fundamental mode while guiding from one level of curvature to another for improved operation of mode filters and fiber amplifiers. A method is provided to find the guidance path. Implementations of these transducers include modal power back converters, and guidance paths into and out of higher order mode filtering devices which work on bending. A spiral structure is shown to incorporate adiabatic bends for a forward-pumped fiber amplifier.02-24-2011
20090034059Suppression of higher-order modes by resonant coupling in bend-compensated optical fibers - The effect of bending is anticipated in an optical fiber design, so that resonant coupling remains an effective strategy for suppressing HOMs. The index profile of the fiber and its bend radius are configured so that there is selective resonant coupling of at least one HOM, but not the fundamental mode, in the bent segment of the fiber. In an illustrative embodiment, the bend radius (or predetermined range of bend radii) of an optical fiber is known a priori. The core and cladding regions are configured to support (guide) the propagation of signal light in a fundamental transverse mode and at least one higher-order transverse mode in the core region. The cladding region includes an outer cladding region and an annular trench region. The trench region includes at least one axially extending, raised-index pedestal (waveguide) region having a refractive index higher than that of the outer cladding region. Within at least the bent segment the at least one pedestal region is configured (i) to support the propagation of at least one transverse mode and (ii) to resonantly couple at least one of the higher-order transverse modes (HOMs) of the core region to at least one transverse mode (e.g., the fundamental mode) of the pedestal region when the fiber is bent to a radius within the predetermined range of radii. In effect, the pedestal regions are configured so that the fiber is pre-compensated for the effect of bending; that is, an uncompensated bent fiber segment suffers high fundamental mode loss due to resonant coupling, whereas the pre-compensated bent fiber segment selectively couples any unwanted HOM from the core region into the pedestal region. In a preferred embodiment, the optical fiber is a LMA fiber incorporated in an optical fiber amplifier or laser package.02-05-2009
20110085230METHOD FOR CONTROLLING AN ERBIUM DOPED FIBER AMPLIFIER (EDFA) AND AMPLIFIER ARRANGEMENT - The invention refers to a method for operating an amplifier with a first amplifier stage (A04-14-2011
20110075252OPTICAL FIBER LASERS AND AMPLIFIERS AND METHODS FOR PROVIDING OPTICAL GAIN - The present invention relates generally to devices for the generation and amplification of electromagnetic energy. The present invention relates more particularly to optical fiber devices, such as lasers and amplifiers, useful for generating and amplifying optical energy. Accordingly, one aspect of the present invention is an optical fiber device for providing optical gain at a selected wavelength, the optical fiber device comprising: one or more sources of optical pump energy; a first length of optical fiber having a core comprising a first cross-sectional region within which the concentration of a rare earth does not fall below 50% of its highest concentration; and a second length of optical fiber comprising a core comprising a first cross-sectional region within which the concentration of the rare earth does not fall below 50% of its highest concentration, wherein the intensity of optical pump energy is higher in the first length of optical fiber than in the second, and the first cross-sectional region of the core of the second length of optical fiber is larger in area than the first cross-sectional region of the core of the first length of optical fiber.03-31-2011
20110249320HIGH BEAM QUALITY AND HIGH AVERAGE POWER FROM LARGE-CORE-SIZE OPTICAL-FIBER AMPLIFIERS - In some embodiments, the present invention provides an apparatus, method and use for improving and merging two existing techniques (core pumping and cladding pumping) to enable high-power fiber-laser systems having excellent beam quality while using large-core (LMA) step-index gain fibers at very high optical power, wherein the core pumping includes mixing a laser seed optical signal (having a signal wavelength) with optical core-pump light (having a core-pump wavelength that is near the signal wavelength) in a manner that matches the modes of the seed optical signal and the pump light. The combined core light is mode matched to the LMA gain fiber. The core-pump light is substantially all absorbed within a short distance from the entry end of the gain fiber and provides a strong pre-amplified signal for later cladding-pumped amplification. In some embodiments, the signal wavelength and the core-pump wavelength are within a single multiplet of a rare-earth dopant.10-13-2011
20110249321SIGNAL AND PUMP MODE-FIELD ADAPTOR FOR DOUBLE-CLAD FIBERS AND ASSOCIATED METHOD - A method and apparatus for mode-matching double-clad fibers. In some embodiments, a first fiber section that has a first core, wherein the first core has a first core diameter connects to a mode-field adaptor, wherein the mode-field adaptor includes a first portion having a central volume that has a substantially constant index-of-refraction radial profile and a diameter larger than the first core diameter, and a second portion that has a graded-index (GRIN) central volume, wherein the GRIN central volume has a central axis and a graded index-of-refraction radial profile having an index that gradually decreases at larger distances from its central axis and a length selected to focus light into the core of a second fiber wherein the second core has a diameter that is larger than the first core diameter, and wherein the second fiber section is double clad. Some embodiments are polarized.10-13-2011
20130120831OPTICAL AMPLIFIERS - An optical amplifier system is provided which comprises first and second optical amplifiers (05-16-2013
20100079855MULTI-CLAD OPTICAL FIBERS - Multi-clad optical fibers and fiber amplifiers are disclosed. Various embodiments include multi-clad, large core fiber amplifiers. In various implementations mixing of pump modes is enhanced relative to that obtainable with conventional double-clad fibers. In some embodiments end terminations are provided with increased length of end-cap fiber. In at least one embodiment a multi-clad fiber is provided, with a pump cladding formed by stacking a layer of low index rods in the preform. Various embodiments include a multi-clad fiber amplifier system. The system includes a pump source to pump said fiber amplifier. The system also includes an optical fiber having a core and a cladding, wherein the cladding includes a pump cladding having a corrugated boundary. In various embodiments the pump cladding is formed by rods in a preform, which are disposed to mix the pump modes and/or scatter or reflect pump energy into the core.04-01-2010
20080304137Light source apparatus - The invention relates to a light source apparatus having a structure for effectively suppressing a negative effect due to a nonlinear effect generated in propagation of an amplifying light, and realizing a stable operation. In the light source apparatus, light amplified in an optical amplifier fiber is emitted to the outside of the apparatus through an optical output fiber whose one end is connected to an output connecter. At this time, a part of Raman scattered light, generated in the optical output fiber, propagates toward an pumping light source through the optical amplifier fiber from the optical output fiber. An optical component having an insertion loss spectrum that attenuates the Raman scattered light but allows pumping light or light to be amplified to transmit therethrough, is provided on a propagation path of the Raman scattered light, due to the light component, the intensity of the Roman scattered light reaching the pumping light source is effectively reduced. As a result, a negative effect due to a nonlinear effect generated in propagation of light to be amplified can be effectively suppressed, and the light source apparatus can be stably operated.12-11-2008
20080204860Multistage Fiber Amplifier and Method For Adapting a Pump Power of a Multistage Fiber Amplifier - The invention relates to a multistage fibre amplifier having a first amplifying fibre (EDFI) and at least one further amplifying fibre (EDF08-28-2008
20100284063OPTICAL AMPLIFIER - An optical amplifier for determining the attenuation of a length of optical fibre (11-11-2010
20100195194Large Mode Area Optical Fiber - A large-mode-area (LMA) optical fiber (08-05-2010
20110261440MODULATION OF FIBER LASER PUMPED DIFFERENCE FREQUENCY GENERATOR - Systems and methods for modulating the output of a difference frequency generator such as an OPO, OPA or OPG include a pump fiber laser having at least one internal, directly modulatible component, wherein the pump fiber laser produces a pump signal, and a difference frequency generator coupled to the pump fiber laser. The difference frequency generator is configured for accepting the pump signal of the pump fiber laser and producing an output signal, wherein parameters of the output signal are determined based on direct modulation of the internal, directly modulatible component of the pump fiber laser.10-27-2011
20100020388AMPLIFYING OPTICAL FIBER - The invention consists in an amplifying optical fiber comprising a core containing a dopant and a cladding, wherein said core comprises a monomode core intended to propagate an optical signal, quantum dots of a semiconductor material being disposed in or near said monomode core, and a multimode core surrounding the monomode core, intended to receive a pumping signal.01-28-2010
20100253998VERY HIGH POWER PULSED FIBER LASER - A high power integrated fiber laser system includes cascaded amplifiers that utilize low numerical aperture fiber amplifiers. The system is rugged and lightweight.10-07-2010
20110063721OPTICAL AMPLIFIER AND OPTICAL AMPLIFICATION METHOD - There is provided an optical amplifier including a pump light source to generate a pump light being capable of changing a wavelength thereof, a first rare earth doped medium to amplify an input signal light by using the pump light generated by the pump light source, a second rare earth doped medium to amplify the input signal light output from the first rare earth doped medium by using a residual pump light that is a portion of the pump light generated by the pump light source, and a wavelength controller to control a wavelength of the pump light generated by the pump light source, based on an input level of the input signal light.03-17-2011
20120057220HIGH POWER FIBER LASER SYSTEM - A tapered fiber bundle device couples optical power from an optical power source into an output fiber. The tapered fiber bundle device includes a tapered fiber bundle including a set of bundled fibers having a near end and a distal end. The near end of the tapered fiber bundle is configured to collect the optical power from the optical power source. Each fiber k in the set of bundled fibers has a first cross-sectional area A03-08-2012
20120206794HIGH POWER PARALLEL FIBER ARRAYS - High power parallel fiber arrays for the amplification of high peak power pulses are described. Fiber arrays based on individual fiber amplifiers as well as fiber arrays based on multi-core fibers can be implemented. The optical phase between the individual fiber amplifier elements of the fiber array is measured and controlled using a variety of phase detection and compensation techniques. High power fiber array amplifiers can be used for EUV and X-ray generation as well as pumping of parametric amplifiers.08-16-2012
20120206793OPTICAL COMBINER AND FIBER LASER DEVICE HAVING THE SAME - An optical combiner 08-16-2012
20110090558 SYSTEM OF METHOD FOR DYNAMIC RANGE EXTENSION - The present invention generally relates to the operation of optical network equipment such as optical amplifiers. In one aspect, a method of operating an optical amplifier is provided such that output of the optical amplifier avoids the effects of operating an optical gain medium in a non-linear (kink) region of an L-I curve. The method generally includes operating an optical gain medium in a fully off state or fully on state above the kink region with a PWM signal. In another aspect, the effects of the kink region may be compensated for by utilizing a lookup table. A sample of the optical power of an amplified optical signal may be used to select an entry in the lookup table that compensates for non-linearities in the kink region. In yet a further aspect, a lookup table may be used to control a pulse modulator to compensate for non-linearites in the kink region of the L-I curve.04-21-2011
20100290107FIBER OPTICAL DEVICE AND METHOD OF DRIVING THE SAME - A fiber optical device 11-18-2010
20120127563ACTIVE TAPERS WITH REDUCED NONLINEARITY - Fiber amplifiers and oscillators include tapered waveguides such as optical fibers that permit multimode propagation but produce amplification and oscillation in a fundamental mode. The tapered waveguides generally are provided with an active dopant such as a rare earth element that is pumped with an optical pump source such as one or more semiconductor lasers. The active waveguide taper is selected to taper from a single or few mode section to a multimode section, and seed beam in a fundamental mode is provided to a section of the waveguide taper associated with a smaller optical mode, and an amplified beam exits the waveguide taper at a section associated with a larger optical mode.05-24-2012
20110181944FIBER AMPLIFIERS AND FIBER LASERS WITH REDUCED OUT-OF-BAND GAIN - A method of operating a fiber amplifier characterized by a spectral gain curve includes providing an input signal at a signal wavelength. The signal wavelength lies within an in-band portion of the spectral gain curve extending from a first in-band wavelength to a second in-band wavelength, the in-band portion being characterized by a first amplitude range. The method also includes providing pump radiation at a pump wavelength. The pump wavelength is less than the signal wavelength. The method further includes coupling the pump radiation to the fiber amplifier and amplifying the input signal to generate an output signal. All portions of the spectral gain curve at wavelengths less than the first in-band wavelength and greater than the pump wavelength are characterized by a second amplitude less than or equal to 10 dB greater than the first amplitude range.07-28-2011
20120212803METHOD AND APPARATUS FOR CONTROLLING AND PROTECTING PULSED HIGH POWER FIBER AMPLIFIER SYSTEMS - An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber amplifier system so that the amplified output pulses have predetermined pulse energy as the pulse width and repetition rate of the oscillator are varied. This includes keeping the pulse energy constant when the pulse train is turned on. The circuitry is also used to control the temperature of the high power fiber amplifier pump diode such that the wavelength of the pump diode is held at the optimum absorption wavelength of the fiber amplifier as the diode current is varied. The circuitry also provides a means of protecting the high power fiber amplifier from damage due to a loss of signal from the pulse source or from a pulse-source signal of insufficient injection energy.08-23-2012
20090059353Large-mode-area optical fibers with reduced bend distortion - In a LMA optical fiber the index of the core region is graded (i.e., as viewed in a radial cross-section) and has a grading depth of Δn03-05-2009
20120250143RARE EARTH DOPED AND LARGE EFFECTIVE AREA OPTICAL FIBERS FOR FIBER LASERS AND AMPLIFIERS - Various embodiments described herein include rare earth doped glass compositions that may be used in optical fiber and rods having large core sizes. Such optical fibers and rods may be employed in fiber lasers and amplifiers. The index of refraction of the glass may be substantially uniform and may be close to that of silica in some embodiments. Possible advantages to such features include reduction of formation of additional waveguides within the core, which becomes increasingly a problem with larger core sizes.10-04-2012
20120314279Multi-fibre arrangement for high power fibre lasers and amplifiers - An optical amplifier includes at least one pump source and an optical fibre cable which includes an amplifying optical fibre and a pump optical fibre that are defined by respective lengths. The amplifying optical fibre and the pump optical fibre are coated with a common coating along a portion of their respective lengths, and the fibres are in optical contact with each other along a coating length within the common coating. The common coating has a refractive index which is lower than a refractive index of a cladding material of the pump optical fibre. The fibres are made substantially from glass. The amplifying optical fibre includes a core and a cladding, and is doped with a rare earth dopant. The pump optical fibre is defined by a first end and a second end, the first end of the pump optical fibre being connected to the pump source.12-13-2012
20130182314FEW MODE OPTICAL FIBERS FOR Er DOPED AMPLIFIERS, AND AMPLIFIERS USING SUCH - According to some embodiments the optical fiber comprises: (i) a glass core doped with greater than 300 ppm of Er07-18-2013
20120081781SHORTER WAVELENGTH PHOTO-ANNEALING APPARATUS FOR RARE-EARTH-DOPED FIBER AND ITS OPTICAL ASSEMBLIES UNDER IRRADIATION - An optical fiber apparatus is suitable to operate under irradiation, more particularly to mitigating the damage of a rare-earth-doped optical fiber element as part of an optical fiber assembly causes by irradiation. The irradiation mitigation attributes to a photo-annealing apparatus including at least a shorter wavelength photo-annealing spectral content, which is relative to that of a pump light source, for effectively photo-annealing the rare-earth-doped fiber element. Photo-annealing by such shorter wavelength light results in a fast and nearly complete recovery of radiation induced attenuation of the rare-earth-doped optical fiber element in the wavelength range from 900 nm to 1700 nm.04-05-2012
20110235165AMPLIFICATION OPTICAL FIBER WITH OPTICAL COMPONENT AND FIBER LASER DEVICE INCLUDING THE SAME - An amplification optical fiber with an optical component capable of efficiently absorbing pumping light and a fiber laser device including the same are provided.09-29-2011
20120327506OPTICAL FIBER AMPLIFIER AND A CONTROL METHOD THEREFOR - An optical amplifier having two erbium doped fiber coils and a pump laser diode is described. A tunable optical power splitter is used for variably splitting the optical pump power for the laser diode between the two erbium doped fiber coils, and variable tilters can be used for correcting the gain tilt of the amplifier. The variable splitter and the tilters can include thermally tunable Mach-Zehnder interferometers.12-27-2012
20100214650BUTTERFLY LASER - Systems and devices enabling a highly compact design for a fiber-based lasing and/or amplifying system are disclosed. In some instances, a tightly-coiled active optical fiber may be coupled with a seed source and a pump source for optical amplification and other applications. Such systems can be disposed in a small footprint package such as a butterfly package or a high heat load package. In some instances, the tightly-wound active optical fiber may further include a fiber Bragg grating adapted to accommodate bends in the active optical fiber. The active optical fiber may further utilize a cladding shaped to maintain an orientation of the active optical fiber in relation to a bend in the fiber.08-26-2010
20120243076METHOD, APPARATUS, AND SYSTEM FOR AMPLIFYING A BURST OPTICAL SIGNAL - Embodiments of the present invention disclose a method, an apparatus, and a system for amplifying a burst optical signal. The method includes: monitoring an input status of a signal light; when no signal light is input, controlling output power of a pump light so that a gain medium has output optical power and the output optical power is less than a maximum optical power that the gain medium is capable of outputting when a signal light is input; inputting the pump light into a wavelength division multiplexer so that the wavelength division multiplexer combines the signal light and the pump light and inputs the combined light into the gain medium. With the preceding manners, when no signal light is input, the power of the pump light is controlled.09-27-2012
20080239471Optical module and processing method - The present invention relates to an optical module which is capable of amplifying light to be amplified to high power and which has a structure for effectively reducing influences of damage to other optical parts, and heat generation. The optical module includes a fiber unit constituted by an optical coupler, an amplification optical fiber, and an absorption optical fiber. Each of the amplification optical fiber and the absorption optical fiber has a core, a first cladding, a second cladding, and a third cladding. Further, each of the fibers allows the light to be amplified to propagate in a single mode in each of the cores, and allows pumping light to propagate in a multimode in the core, the first cladding, and the second cladding. The core of the amplification optical fiber is doped with an amplification dopant for amplifying the light to be amplified. The second cladding of the absorption optical fiber is doped with an absorption dopant for absorbing the pumping light.10-02-2008
20130114129LARGE CORE AREA SINGLE MODE OPTICAL FIBER - A single-mode optical fiber for guiding an optical signal, wherein the core region is capable of guiding an optical signal in a fundamental core mode at an optical signal wavelength. A cladding region is arranged to surround the core region and includes an inner cladding region and an outer cladding region. The inner cladding region includes a background material and a plurality of inner cladding features arranged in the background material, wherein a plurality of the plurality of inner cladding features are of a first type of feature that includes an air hole surrounded by a high-index region comprising a high-index material that is larger than the refractive index of the inner cladding background material.05-09-2013
20110273764HIGH POWER AND HIGH GAIN FIBER AMPLIFIER - A device for amplifying optical signals propagating in optical fibers comprising a double cladding fiber amplifier having multiple gain stages, a port for coupling pump light into the double cladding fiber amplifier, and a double cladding fiber coupler for splitting the coupled pump light between the gain stages of the double cladding fiber amplifier. Also, a method for amplifying optical signals propagating in optical fibers comprising the steps of providing a double cladding fiber amplifier having multiple gain stages, coupling pump light into the double cladding fiber amplifier, and splitting the coupled pump light between the gain stages of the double cladding fiber amplifier.11-10-2011
20110228382CLADDING-PUMPED OPTICAL WAVEGUIDE - The invention relates to a high power amplifier waveguide for amplifying an optical signal wherein photo darkening due to high optical flux is reduced considerably. This is achieved by providing a cladding pumped amplifier waveguide wherein the optical mode overlap to the active material of the waveguide is low and/or wherein the active material is distributed over a large cross sectional region of the waveguide.09-22-2011
20120257271MULTI-CLAD OPTICAL FIBERS - Multi-clad optical fibers and fiber amplifiers are disclosed. Various embodiments include multi-clad, large core fiber amplifiers. In various implementations mixing of pump modes is enhanced relative to that obtainable with conventional double-clad fibers. In some embodiments end terminations are provided with increased length of end-cap fiber. In at least one embodiment a multi-clad fiber is provided, with a pump cladding formed by stacking a layer of low index rods in the preform. Various embodiments include a multi-clad fiber amplifier system. The system includes a pump source to pump said fiber amplifier. The system also includes an optical fiber having a core and a cladding, wherein the cladding includes a pump cladding having a corrugated boundary. In various embodiments the pump cladding is formed by rods in a preform, which are disposed to mix the pump modes and/or scatter or reflect pump energy into the core.10-11-2012
20120275015AMPLIFYING OPTICAL FIBER AND OPTICAL FIBER AMPLIFIER - An amplifying optical fiber includes a core doped with an active element, a cladding covering the core, and an outer cladding covering the cladding. The cladding meets a relationship of 0.92≦r/R≦0.97 where the cladding has a polygonal outer shape in cross section, and the outer shape has an inscribed circle of a diameter r and a circumscribed circle of a diameter R.11-01-2012
20100315701OPTICAL AMPLIFIER AND METHOD FOR SUPPRESSING POLARIZATION DEPENDENT GAIN OF OPTICAL AMPLIFIER - An apparatus includes a first optical amplifier that uses a rare-earth-doped optical medium, an isolator that inputs amplified light amplified by the first optical amplifier, a second optical amplifier that uses a rare-earth-doped optical medium to amplify a light output from the isolator, and a first light router that routes amplified spontaneous emission light generated by the first optical amplifier or the second optical amplifier to input, by a second light router, the routed amplified spontaneous emission light to the optical rare-earth-doped medium other than the optical rare-earth-doped medium where the routed amplified spontaneous emission light is generated.12-16-2010
20110310469FIBER LASER APPARATUS AND OPTICAL AMPLIFICATION METHOD - A fiber laser apparatus includes an optical amplification fiber with a multi-core structure composed of a first waveguide that pumping light enters and that transmits the pumping light; a second waveguide composed of a core containing a laser medium and for generating laser, and a clad for transmitting pumping light; and a third waveguide containing the first waveguide and the second waveguide. The optical amplification fiber is wound while the curvature radius is being changed to provide a small-size, high-power fiber laser apparatus.12-22-2011
20110310468HYBRID FIBER-MOPA - A master oscillator power-amplifier stages includes multiple stages of fiber-amplification with a final power amplifier stage in the form of a multi-pass amplifier. With a thin-disk gain medium in one example the thin-disk amplifier includes a common optical arrangement for providing multiple incidences of radiation to be amplified and multiple incidences of a pump-radiation beam on the thin-disk gain medium.12-22-2011
20120019902INTERGRATED PUMP LASER AND RARE EARTH WAVEGUIDE AMPLIFIER - A light amplifier includes a single crystal semiconductor substrate with a rare earth oxide, light amplifying gain medium deposited on the substrate and formed into a light waveguide, and a pump laser. A lattice matching virtual substrate integrates the pump laser to the gain medium with a first opposed surface crystal lattice matched to the gain medium and second opposed surface crystal lattice matched to the pump laser. The pump laser is positioned with a light output surface coupled to a light input surface of the gain medium so as to introduce pump energy into the light waveguide. The light amplifier has a very small footprint and allows the integration of control and monitoring electronics.01-26-2012

Patent applications in class Pumping

Patent applications in all subclasses Pumping