Class / Patent application number | Description | Number of patent applications / Date published |
398093000 | Including feedback | 15 |
20100316386 | TECHNIQUES FOR CONTROLLING A LIGHT SOURCE IN A WAVELENGTH DIVISION MULTIPLEXED PASSIVE OPTICAL NETWORK - Techniques for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON) are disclosed. In one particular exemplary embodiment, the techniques may be realized as an apparatus for controlling a light source in a wavelength division multiplexed passive optical network (WDM-PON). The apparatus may include a digital signal processing device configured to output a pilot tone signal. The apparatus may also include an amplifier configured to modulate a modulation current and the pilot tone signal, and output an amplitude modulated signal. The apparatus may further include a capacitor configured to AC couple the amplitude modulated signal to a bias current applied to a light source; and a monitoring photodiode configured to detect an output optical signal of the light source and transmit the detected output optical signal to the digital signal processing device to control the output optical signal of the light source. | 12-16-2010 |
20100322633 | TRANSMISSION SYSTEM AND METHOD OF CORRECTING TILT OF THE TRANSMISSION SYSTEM - A transmission system is provided with a transmission apparatus that outputs an ASE light from a transmission light amplifier and with a reception apparatus provided with: a tilt detection unit that detects the optical strength levels of at least two probe lights having different wavelengths from a received ASE light; and a reception light amplifier that performs a first-order tilt correction on light to be output in a linear manner so as to reduce the difference in the optical strength level of the two probe lights detected by the tilt detection unit. | 12-23-2010 |
20110182587 | SYSTEM AND METHODS FOR CONVERTING A TEMPORALLY SHORT AND SPECTRALLY BROAD OPTICAL PULSE INTO A TRAIN OF SPECTRALLY NARROW OPTICAL PULSES - A system and methods are provided for converting a first temporally short and spectrally broad optical pulse into a train of spectrally narrow and distinct optical pulses. This involves receiving, on a first I/O channel, the first optical pulse associated with a plurality of wavelengths and performing wavelength division demultiplexing on the first optical pulse at an optical unit housed on an optical chip to output a plurality of second optical pulses on different ones of a plurality of second I/O channels, each of the second optical pulses associated with a unique wavelength range from the first optical pulse. This also involves receiving the second optical pulses at loop mirrors in the second I/O channels, wherein the second I/O channels are patterned as waveguides in the optical chip and reflecting, at the loop mirrors, the second optical pulses back to the optical unit. | 07-28-2011 |
20120263474 | Method for Arbitrary Optical Microwave and MM-Wave Generation - A method for an arbitrary optical microwave and mm-wave generation includes generating 2N+1 optical carriers while employing only one continuous wave CW lightwave with a recirculating multi-tone generator; and selecting optical carriers with an arbitrary-frequency optical millimeter-wave generator responsive to the prior generating. | 10-18-2012 |
20130177317 | OPTICAL DISTRIBUTED ANTENNA SYSTEM - Optical distributed antenna systems comprising a head-end unit adapted to transmit downlink a modulated optical signal with wavelength λ | 07-11-2013 |
20130287402 | OPTICAL RECEIVER IMPLEMENTED WITH SEMICONDUCTOR OPTICAL AMPLIFIER IN FRONT END THEREOF AND METHOD TO CONTROL THE SAME - An optical receiver implemented with a semiconductor amplifier (SOA) whose temperature is controlled by the automatic temperature control (ATC) circuit is disclosed. The optical receiver further includes an optical de-multiplexer, optical devices, a signal processor, and a controller. The controller monitors a temperature of the SOA and time derivatives thereof. The controller activates the optical devices and the signal processor after the time derivative of the temperature of the SOA becomes less than a reference. | 10-31-2013 |
20140233958 | Uni-fiber Lasercom Terminal Design - A method, system, and apparatus for a uni-fiber laser communications (lasercom) terminal are disclosed herein. The apparatus includes an oscillator to generate a first signal having a first wavelength, and a modulator to modulate the first signal. The apparatus further includes a circulator to circulate the first signal, and a bi-directional optical amplifier (optical amp) to amplify the first signal. Also, the apparatus includes an optical fiber, which is embedded in a ferrule, and an end of the ferrule is coated with a reflective coating. Additionally, the apparatus includes at least one lens, where the first signal is transmitted through and received through the optical fiber and at least one lens. Also, the apparatus includes an acquisition detector to detect the first signal. Further, the apparatus includes an actuator associated with the ferrule to nutate and translate the ferrule according to feedback from the acquisition detector regarding the first signal. | 08-21-2014 |
398094000 | Power control | 4 |
20090154931 | ARRANGEMENT FOR COMPENSATING RAMAN SCATTERING - A light beam which is used for transmitting a wavelength division multiplex signal is guided to a Bragg grating via an adjustable mirror. According to the angle of incidence of the light beam relative to the longitudinal axis of the Bragg grating, different transmission characteristic curves having different gradients are produced. As a result thereof, scattering of the wavelength division multiplex signal can be compensated. A second controllable mirror enables the damping to be adjusted. A control device effects a rapid correction of the scattering after data signals are connected or disconnected. | 06-18-2009 |
20100239263 | OPTICAL RELAY DEVICE AND OPTICAL RELAY TRANSMISSION SYSTEM - A control-target-value setting unit sets a control target value corresponding to the number of multiplexed wavelengths measured by a number-of-multiplexed-wavelengths measuring unit. A controller controls the variable optical attenuator based on the control target value. An optical amplifier performs an optical amplification with a constant gain regardless of power of a wavelength-multiplexed light. The controller performs feedback control of the variable optical attenuator such that a result of measurement of the total power of the wavelength-multiplexed light coincides with the control target value. | 09-23-2010 |
20110274431 | APPARATUS AND METHOD FOR CONTROLLING A DYNAMIC GAIN EQUALIZER - Consistent with the present disclosure, a method and apparatus for providing a uniform spectral gain of an optical amplifier is provided. Namely, a “balancing” step is carried out in which an optical channel having the lowest power level input to an optical circuit, such as an dynamic gain equalizer (DGE), is assigned a zero “attenuation error” and is substantially un-attenuated by the DGE. The lowest power level optical signal does not require further attenuation and effectively serves as a reference power level, which the power levels of the remaining optical signals are set to. For example, remaining optical signals are assigned either positive or negative attenuation errors relative to the zero attenuation error based on optical signal input powers to the DGE and accumulated DGE attenuations over time. Those optical signals having a negative attenuation error are substantially unattenuated by the DGE, because such optical signals are adequately attenuated and do not require further attenuation. On the other hand, the DGE is controlled to attenuate those optical signals having positive attenuation errors to thereby flatten the output spectrum of the amplifier. In one example, interpolation techniques may be employed to control those portions of the DGE (e.g., attenuators or pixels) that do not receive a channel, such that adjacent pixels that receive channels may impart a desired amount of attenuation. In addition, further interpolation may be provided to appropriately control the DGE pixels, if the number of channels supplied to the DGE is different than the number of pixels of the DGE. | 11-10-2011 |
20130188958 | FEEDBACK LIGHT TUNING DEVICE AND OPTICAL COMMUNICATION SYSTEM AND METHOD USING THE SAME - A feedback light tuning device and the optical communication system and method using the same are provided. By tuning the feedback light, the mechanism can completely correct the mean-wavelength drift up to 30 nm or 19400 ppm. The mechanism can be applied to various harsh environments which cause the mean-wavelength drift, so as to achieve a required stable mean-wavelength for the light source and to increase the acceptable range of radiation dose. | 07-25-2013 |
398095000 | Wavelength control | 4 |
20120251122 | Method of Operating an Optical Network Element and Optical Network Element - The invention relates to a method of operating a first optical network element ( | 10-04-2012 |
20130084073 | Shared Wavelength Locker With A Periodic Transmission Filter In A Network Communication Path - An apparatus comprising a plurality of optical transmitters and a wavelength locker shared by the plurality of optical transmitters. A periodic transmission filter used for wavelength locker operations is in a network communication path and shapes optical transmissions from the plurality of optical transmitters to a network. An apparatus comprising at least one processor configured to receive a pre-filter signal corresponding to part of an optical signal comprising a pilot tone and to receive a post-filter signal corresponding to a part of the optical signal that passes through a period transmission filter, wherein a filtered part of the optical signal is directed into a network. The processor is also configured to perform wavelength locking based on a quadrature detection technique that aligns an adiabatic logical one position of a modulated transmission signal with a spectral transmission peak of the period transmission filter. | 04-04-2013 |
20150104180 | HIGH BRIGHTNESS DENSE WAVELENGTH MULTIPLEXING LASER - The present disclosure describes systems and methods for beam wavelength stabilization and output beam combining in dense wavelength multiplexing (DWM) systems. Systems and methods are described for performing beam wavelength stabilization and output beam combining in DWM systems while achieving increased wall-plug efficiency and enhanced beam quality. Interferometric external resonator configurations can be used to greatly increase the brightness of DWM system output beams by stabilizing the wavelengths of the beams emitted by the emitters of the DWM laser source. The resonant cavities described by the present disclosure provide advantages over the prior art in the form of decreased cost, increased wall plug efficiency and increased output beam quality. Particular implementations of the disclosure achieve increased wall plug efficiency and increased output beam quality through a combination of innovative cavity designs and the utilization of reflection diffraction elements for beam combining. | 04-16-2015 |
20160381441 | OPTICAL TRANSMISSION DEVICE, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMISSION METHOD - An optical transmission device includes: a wavelength filter configured to allow passage of an optical signal having a band; a monitor configured to monitor a wavelength of the optical signal; and a controller configured to detect, based on a monitoring result of the monitor, a change in the wavelength of the optical signal, to predict, based on the detected result, a direction of the change in the wavelength of the optical signal, and to expand a passband of the wavelength filter in the direction of the change. | 12-29-2016 |