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| Number | Title | Issue Date |
| 8139286 | Self-adapting feed forward control apparatus and method in an optical amplifier A Self-adapting feed forward control apparatus in an optical amplifier includes a feed forward controller for collecting target output power (Pout) and controlling drive current of a pump laser in the optical amplifier; a feedback controller for calculating target o... | 03/20/2012 |
| 8134776 | Optical amplifier output control based on change in detected input power This specification describes technologies relating to controlling optical amplifiers. In one implementation, an optical amplifier is provided. The optical amplifier includes a light amplifying medium for receiving an input optical signal and outputting an output amp... | 03/13/2012 |
| 8102595 | Optical transmission system with optical amplifier gain setup based on difference between signal loss and noise light loss In an optical transmission system, a controller acquires a noise light loss value, which indicates a loss that noise light output from an upstream-side optical amplifier undergoes during propagation to a downstream-side optical amplifier through an optical loss medi... | 01/24/2012 |
| 8098426 | Two-way amplifier for passive optical network (PON) A two-way optical amplifier system amplifies upstream and downstream optical signals in a passive optical network (PON). The downstream optical amplifier system includes an optical amplifier (EDFA), configured and arrange to amplify the downstream optical transport ... | 01/17/2012 |
| 7969649 | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The optical attenuator passes the amplified light signal and has a varia... | 06/28/2011 |
| 7929201 | Multistage optical amplifier with gain control using pump ratio According to an aspect of the embodiment of the invention, an optical amplifier including an input port, an output port, a plurality of amplifying parts, an optical attenuator, a gain controller and an optical attenuator controller. The plurality of amplifying parts... | 04/19/2011 |
| 7876498 | Pulse-energy-stabilization approach and first-pulse-suppression method using fiber amplifier In some embodiments, the present invention provides an apparatus and process wherein excess stored optical energy is removed from one or more stages in a fiber-amplifier, in order to stabilize the gain and obtain a constant level of energy per pulse. In some embodim... | 01/25/2011 |
| 7864411 | Optical amplifier, optical amplifier controller and control method of the same An optical amplifier includes a detecting section configured to detect a part of an input optical signal from a first node on an input side optical fiber; and a rare earth element doped optical fiber amplifier configured to amplify a remaining part of the input opti... | 01/04/2011 |
| 7843631 | Gain control apparatus, optical transmission apparatus, gain control method for optical amplifier, and wavelength multiplex optical transmission system The present invention relates to an apparatus for controlling a gain of an optical amplifier, and the apparatus comprises a target gain calculating unit for calculating, as a target gain for an optical amplifier, a value obtained by increasing or decreasing a gain (... | 11/30/2010 |
| 7760423 | Optical amplifier The present invention relates to an optical amplifier with a structure for more effectively suppressing the over/undershoot in transient responses in high-speed AGC. This optical amplifier is an optical device for amplifying signal light inputted therein, and compri... | 07/20/2010 |
| 7746548 | Optical amplifier transient control with gain error limits Optical amplifier transient control methods and apparatus which limit the extent of cumulative transient gain errors in the rapid control of multiple optical amplifiers in a communication system. In an exemplary embodiment, if the input power to an optical amplifier... | 06/29/2010 |
| 7554720 | Optical transmission apparatus with automatic gain control and automatic level control mode selection A transmission apparatus designed to be capable of monitoring faults which occur between the input stage of an optical multiplexer and the input stage of an optical amplifier, appropriately switching between automatic gain control and automatic level control, and ou... | 06/30/2009 |
| 7538937 | Optical amplifier An optical amplifier includes a rare-earth doped optical fiber or rare-earth doped optical waveguide serving as an amplification medium where rare-earth ions have been doped in its core and/or clad, an excitation mechanism for exciting the amplification medium, an o... | 05/26/2009 |
| 7535632 | Compensation of gain variations in a multistage optical amplifier There is described a method for compensation of gain variations in a multistage optical amplifier, for the amplification of an optical wavelength multiplex signal, comprising several amplifier stages in series, each with at least one pumping device. Gain variation o... | 05/19/2009 |
| 7511883 | Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the ... | 03/31/2009 |
| 7499212 | Optical amplifier An optical amplifier is disclosed that includes an input monitoring part configured to monitor an input wavelength division multiplexed light; an amplification part configured to amplify and output the input wavelength division multiplexed light; an output monitorin... | 03/03/2009 |
| 7480092 | Optical amplification method and device usable with bands other than the C-band An optical amplifier includes an optical amplification medium, an excitation source to stimulate the amplification medium to output at least one wavelength gain peak, and a gain equalizer to equalize the output of the amplification medium such that gain is produced ... | 01/20/2009 |
| 7477447 | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The optical attenuator passes the amplified light signal and has a varia... | 01/13/2009 |
| 7468832 | Method and system for coherent beam combining using an integrated diffractive beam combiner and sampler A system and method for combining plural low power light beams into a coherent high power light beam by means of a diffractive optical element operating as both a beam combiner and beam sampler. An oscillation source transmits a master signal that is split into plur... | 12/23/2008 |
| 7453627 | Method for controlling the pump power of an optical amplifier The present disclosure relates to a method for regulating a pump power of an optical amplifier, where a multiplexed broadband optical signal having several channels is amplified at a certain gain value while a change in power is detected at the input or output of th... | 11/18/2008 |
| 7417790 | Looped optical network with ASE light recirculation and link and network survivability control system A looped WDM optical network comprises an optical loop with optical amplifiers (12,16) between the sections of the loop (11) and with ASE recirculation in the loop. At a point of the loop a laser beam is injected and allowed to circulate in the loop wi... | 08/26/2008 |
| 7417792 | Optical amplification device An optical amplification device is disclosed that performs feedback control to maintain an amplification gain to be a constant based on measured power of input light and power of output light. The device includes a feedback control coefficient switching unit configu... | 08/26/2008 |
| 7405870 | Method and apparatus for amplified spontaneous emission corrected automatic signal power control of an optical amplifier An optical amplifier system and controller and a method for automatically controlling the usable signal power of an optical amplifier are provided. The method differentiates between the total optical power that includes the amplified spontaneous emission (ASE), and ... | 07/29/2008 |
| 7400443 | Method and apparatus for optical amplifying device gain control with gain threshold Optical amplifying method and apparatus are proposed. Constant gain amplifiers operate such that the output power of the amplifier generally tracks the input power. However, optical systems are not perfect and the input to the optical amplifier stage includes not on... | 07/15/2008 |
| 7400444 | Optical amplifier and control method for optical amplifier An amount of ASE generated changes due to a temperature and respective powers of signals input to and output from an optical amplifying unit, causing a fluctuation of a gain of the optical amplifying unit. A photodiode on an input side and a photodiode on an output ... | 07/15/2008 |
| 7394590 | Control device and control method of optical amplifier There are provided an ASE correction unit which corrects control errors regarding either or both of the gain and the output level of the optical amplifier, which control errors are generated due to the ASE, and an ASE correction controller which controls the correct... | 07/01/2008 |
| 7388711 | Controlling apparatus for optical amplifier and controlling method thereof An optical amplifier is provided with a controlling unit for controlling a gain of the optical amplifier based on input light power and output light power of the optical amplifier, as well as a gain control amount variable unit for changing the gain control amount o... | 06/17/2008 |
| 7379237 | Photonic-crystal-rod amplifiers for high-power pulsed optical radiation and associated method A method and apparatus use a photonic-crystal fiber having a very large core while maintaining a single transverse mode. In some fiber lasers and amplifiers having large cores problems exist related to energy being generated at multiple-modes (i.e., polygamy), and o... | 05/27/2008 |
| 7375876 | Optical transmitting apparatus having variable optical transmitting unit including plurality of paths An optical transmitting apparatus includes a variable optical attenuating unit for attenuating signal light variably, an optical amplifying unit for amplifying the signal light, and a looped optical circuit for returning the signal light from the optical amplifying ... | 05/20/2008 |
| 7375877 | Method and apparatus for long-range lidar and active imaging with optical output from a photonic-crystal rod A method and apparatus use a photonic-crystal fiber having a very large core while maintaining a single transverse mode. In some fiber lasers and amplifiers having large cores problems exist related to energy being generated at multiple-modes (i.e., polygamy), and o... | 05/20/2008 |
| 7365902 | Optical amplifier and optical communication system An optical amplifier includes a plurality of pump light sources, an intensity modulator that modulates intensity of a pump light to be output from any one of the pump light sources, at a predetermined frequency; a photoelectric converter that converts a part of the ... | 04/29/2008 |
| 7362499 | Optical amplifier with pump light source control for Raman amplification A Raman amplifier for amplifying a wavelength division multiplexed (WDM) light including signal lights wavelength division multiplexed together. The amplifier includes an optical amplifying medium and a controller. The optical amplifying medium uses Raman amplificat... | 04/22/2008 |
| 7362498 | Method and apparatus for controlling a semiconductor optical amplifier for use in a passive optical network An optical amplifier including: an amplifier having an input port and an output port, which is disposed along a main signal line of the optical amplifier; a dummy laser generation circuit having an output coupled to the main signal line and operative for inputting a... | 04/22/2008 |
| 7362925 | Control method and control apparatus of optical device The present invention aims at providing a control method and a control apparatus for controlling the operation setting of an optical device with high accuracy, so as to reliably obtain characteristics according to a desired relationship to be set corresponding to a ... | 04/22/2008 |
| 7359112 | Individual band gain equalizer for optical amplifiers A control apparatus comprises a light monitoring unit for dividing a signal wavelength band into at least a band in which output light power of an optical amplifier tends to decrease at an decrease in the number of signal wavelengths and a band including a gain devi... | 04/15/2008 |
| 7345811 | Multimode fiber optic amplifier and method of amplifying optical signals A multimode fiber receiver includes a multimode collimator, a multimode fiber optic amplifier and a detector. The collimator receives incoming signals and provides the signals to the amplifier. The amplifier includes plural amplification stages, a limiter, a tunable... | 03/18/2008 |
| 7343097 | Optical transmission systems including optical amplifiers and methods of use therein Optical transmission systems including a plurality of optical amplifiers configured to provide optical amplification of one or more information carrying optical signal wavelengths. At least two of the optical amplifiers are operated to provide net losses or net gain... | 03/11/2008 |
| 7332360 | Early detection of metal wiring reliability using a noise spectrum The present invention generally provides an apparatus and a method for inspecting a substrate in a substrate processing system. In one aspect, a voltage or current source is used in conjunction with a power density receiving device, such as a spectrometer, to inspec... | 02/19/2008 |
| 7333262 | Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the ... | 02/19/2008 |
| 7330303 | Wavelength division multiplexed optical amplifier A wavelength division multiplexed optical amplifier, enabling elimination of the problems of oscillation and fluctuation in output due to ASE at the time of a rapid change in the number of input wavelengths, provided with a first-stage optical amplifying unit, secon... | 02/12/2008 |
