| CHIRAL PHOTONICS, INC. Patent applications |
| Patent application number | Title | Published |
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| 20110002579 | Polarization Maintaining Optical Fiber Polarizer - A novel in-fiber polarizer is provided that is implemented in an optical fiber structure based on a polarization maintaining (“PM”) optical fiber, and that is configured to impart a predetermined desired polarization to a light signal transmission of a predetermined at least one wavelength transmitted therethrough. The inventive polarizer comprises a PM optical fiber structure, with an entry end for receiving incident light and an exit end for outputting polarized light, having an optical fiber core, having at least one core mode and a core propagation constant, surrounded by a cladding, having at least one cladding mode and a cladding propagation constant, that further comprises a reduced core diameter region of a predetermined length between its entry and exit ends, wherein various predefined parameters of the modified PM optical fiber structure, including but not being limited to, the core and cladding propagation constants, the value of the reduced core diameter, and the length of the reduced core diameter region are selected and configured to produce a constructive interference for one light polarization of the input light signal, corresponding to the desired polarization, and to produce a destructive interference for a polarization orthogonal to the desired polarization, to thereby only output, at the polarizer exit end, the desired polarization component of the light signal transmission at the at least one wavelength. Additional embodiments of the inventive polarizer include multiple sequential polarizer structures with specially configured interconnects. | 01-06-2011 |
| 20100158438 | Fiber Optic Diffraction Grating - The present invention is directed to an optical fiber grating having a core, that is capable of controlling the light signal transmission therethrough by causing at least one of: at least one spectral peak, and/or at least one spectral dip in its core light transmission spectrum, corresponding to at least one predetermined wavelength. The inventive optical fiber diffraction grating comprises at least one longitudinally positioned structural element of a predetermined geometric profile and that is configured for diffracting a portion of the transmitted light signal at at least one predefined wavelength thereof, from at least one core mode into at least one of: at least one cladding mode and/or at least one radiating mode. Various embodiments of a number of novel techniques for fabrication of the inventive optical fiber diffraction grating are provided, inclusive of a novel technique for fabricating the inventive grating from a single material. Advantageously, such novel fabrication techniques rely on configuration of a desired geometric profile for the at least one structural element portion of the novel grating, each profile comprising a number of readily configurable parameters that can be selected and/or adjusted during fabrication, to produce a variety of novel fiber diffraction gratings, each having a corresponding specific desirable core transmission spectrum having at least one of: least one spectral peak, and/or at least one spectral dip therein, corresponding to at least one specific desired wavelength, dependent on the configuration of the applicable geometric profile. | 06-24-2010 |
| 20100008627 | DUAL TWIST SINGLE HELIX OPTICAL FIBER GRATING - A single helix chiral fiber grating of a predetermined grating strength is provided that is operable to control light transmission in a predetermined wavelength range. The novel fiber grating comprises a first optical fiber with a first interface portion at a first end, a second interface portion at a second end, and a middle portion therebetween. The first optical fiber is configured with at least one fiber core, surrounded by a corresponding at least one cladding, with a first longitudinal section disposed within the first interface portion, a second longitudinal section disposed within the second interface portion, and also includes a longitudinal helical section, disposed therebetween within the middle portion, that comprises a longitudinal helix structure of a single predetermined handedness, having a predetermined pitch profile, and having a predetermined helix diameter profile selected and configured to produce the predetermined grating strength. The helical section of the novel fiber grating is preferably produced by placing the first optical fiber, proximal to and parallel with a second fiber (or equivalent elongated member), and longitudinally twisting them together to form a double helix structure. Advantageously, the diameter of the second fiber (or a diameter profile thereof) may be selected to achieve the predetermined helix diameter profile in the helical section of the first fiber. The second fiber may be left proximal to the first fiber after fabrication or removed. | 01-14-2010 |
| 20100008624 | OPTICAL FIBER COUPLER ARRAY - An optical fiber coupler array capable of providing multiple low loss, high coupling coefficient interfaces between a predetermined number of low numerical aperture optical fibers and an optical waveguide device with at least a corresponding number of waveguide interfaces. The novel coupler array includes a plurality of coupler inner cores and a plurality of corresponding coupler outer cores, within a medium surrounding each plural outer core, and also includes a first end for interfacing with plural optical fibers and a second end for interfacing with a plurality of waveguide interfaces of an optical waveguide device. The sizes of the inner and outer cores are gradually reduced from the first end to the second end in accordance with at least one predetermined reduction profile. Various parameters, such as refractive indices and sizes of the inner and outer cores and the medium (as well as the reduction profile) are selected to produce a plurality of low numerical aperture waveguides at the first end, and a plurality of high numerical aperture waveguides at the second end, while advantageously minimizing insertion loss and maximizing the coupling coefficient at each end. Advantageously, the novel coupler array may be fabricated as an array of individually drawn couplers from multiple parallel fused performs (arranged in a row, or in another geometric cross section). Alternately, the novel coupler array may be fabricated from a single perform (glass or polymer) embedded with a plurality of parallel inner and outer core sets. | 01-14-2010 |
| 20100008616 | CHIRAL FIBER POLARIZER - An chiral optical fiber polarizer is provided that is capable of being fabricated in-line along a conventional polarization maintaining fiber, preferably one which includes at least one structure element that is external, and parallel, to the fiber's core. The novel chiral fiber polarizer is preferably positioned between two unmodified optical fiber portions, and includes a modified central portion with altered fiber cladding interface elements on each side thereof. The modified central portion is of a non-circular cross section, and comprises at least one diameter reduced sub-section operable to allow a light signal of said predefined operation wavelength to propagate substantially in the core and in the at least one external structure element, at least one diameter expanded sub-section operable to allow a light signal to propagate substantially in the core, each sub-section being produced in accordance with a corresponding predefined diameter reduction and expansion profile, where the modified central portion is further configured in accordance with at least one helical pitch profile that is operable to, upon receiving a light signal with a first and second linear polarization components: convert the first linear polarization component to a first elliptical polarization component while scattering the first elliptical polarization component, and convert the second linear polarization component to a second elliptical polarization component, transmit therethrough, and convert back to the second linear polarization component prior to exit therefrom. The inventive polarizer also substantially eliminates the possibility of an undesirable SBS effect. | 01-14-2010 |
| 20100002983 | DISTRIBUTED OPTICAL FIBER DETECTION SYSTEM - A distributed elongated optical fiber detection system is provided, having at least one sensitive region, and being capable of detecting the occurrence and location(s) of one or more events along its length that cause one or more perturbations in the at least one sensitive region. In one embodiment of the invention, the novel detection system includes, at its first end, an optical signal source capable of launching a signal in a first signal mode through an optical fiber waveguide comprising at least one sensitive region along its length, and configured for transmitting at least two signal modes therethrough, toward its second end. A reflecting device, capable of reflecting only signals in a second signal mode, is positioned at the second end of the waveguide. An occurrence of at least one event in at least one sensitive region causes a perturbation in the waveguide sufficient to couple at least a portion of the energy of the forward traveling signal into a second signal mode, such that the signal in the second signal mode is reflected back toward the first end of the waveguide. A detector, capable of detecting at least one characteristic of a reflected signal in the second signal mode, is connected to the first end of the waveguide, such that when the at least one event occurs, and a reflected signal in the second signal mode is produced, the detector is capable of determining the quantity of one or more occurring events as well as a location of each of the events along the waveguide lengths. In another inventive embodiment, instead of a reflector, the detector is connected to the second end and detects the signal in the second mode directly. | 01-07-2010 |
| 20090324159 | OPTICAL CHIRAL FIBER ISOLATOR AND METHOD OF FABRICATION THEREOF - The present invention provides an optical in-fiber chiral fiber isolator, capable of transmitting a signal of a predetermined optical polarization in a forward direction therethrough, while rejecting all signals traveling in a backward direction therethrough, and a method of fabrication thereof. In one exemplary embodiment, the inventive optical chiral fiber isolator includes a chiral magneto-optical fiber having a helical pitch profile, a birefringence profile, and an effective Verdet constant profile, at least a portion of which is exposed to a magnetic field of a predetermined magnetic field profile (generated by a proximal magnetic field source), where the magnetic field profile, the chiral pitch profile, the birefringence profile, and the effective Verdet constant profile are selected and configured such that the inventive isolator is capable of transmitting a signal of a predetermined optical polarization in a direction from its input end toward its output end, and to reject all signals in a direction from its output end to its input end. | 12-31-2009 |
| 20090136176 | OPTICAL FIBER MODE COUPLING DEVICE, HAVING AN OPTIMIZED FIBER INTERFACE AND METHOD OF FABRICATION THEREOF - An optical fiber mode coupling device, capable of being readily connected to a conventional optical fiber with a high degree of ruggedness, is provided. The inventive mode coupling device only allows transmission of at least one supported fiber mode therethrough, and is preferably configured to maximize the coupling, of at least one desired fiber mode, to the at least one supported fiber mode. Advantageously, the inventive mode coupling device is capable of performing the functions of a mode filter for the signal entering its first end, or serving as a mode conditioner for the signal entering its opposite second end. Thus, in one practical application thereof, the novel mode coupling device functions as a mode filter by maximizing the coupling between at least one desired fiber mode of a multi-mode input signal entering the device's first end, and at least one supported mode of the device, to produce an output signal at the device's second end that comprises at least one predetermined fiber mode, corresponding to at least one desired fiber mode. In another practical application thereof, the novel mode coupling device functions as a mode conditioner by maximizing the coupling between an input signal, comprising at least one predetermined fiber mode, that enters the device's second end, and, and at least one supported mode of the device, to produce an output signal at the device's first end that comprises at least one desired fiber mode, corresponding to a conditioned at least one predetermined fiber mode. | 05-28-2009 |
