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| Number | Title | Issue Date |
| 7751119 | Optical surge suppressive type optical amplifier According to an optical surge suppressive type optical amplifier in the present invention, for a WDM optical amplifier having a multi-stages amplification configuration in which a plurality of optical amplifying means is connected in series, an optical amplifying me... | 07/06/2010 |
| 7746549 | Optical communication apparatus An optical communication apparatus includes an erbium-doped optical fiber amplifier for amplifying a modulated optical signal, wherein a light which is not modulated is inputted to the erbium-doped optical fiber amplifier together with the optical signal. ... | 06/29/2010 |
| 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 |
| 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 |
| RE40270 | Optical amplifying device An optical brancher branches an input optical signal into two. An optical detector converts one optical signal branched by the optical brancher into an electrical signal. A first controller generates a control electrical signal having a waveform obtained by invertin... | 04/29/2008 |
| 7340133 | Configurable dispersion compensation trimmer The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus achieving precise dispersion compensation in a fiber span is disclosed. In pa... | 03/04/2008 |
| 7327958 | Transient-based channel growth for optical transmission systems A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control techni... | 02/05/2008 |
| 7251071 | Transient control in optical transmission systems In an optical transmission system, operations of certain elements are adjusted in an individualized manner after detecting a change in the total optical power level corresponding to multiple optical channels in a link of the system in order to control transients in ... | 07/31/2007 |
| 7227681 | 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 amplifier which amplifies a wavelength division multiplexed (WDM) optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes (a) an optical attenua... | 06/05/2007 |
| 7215464 | Optical amplifier Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal li... | 05/08/2007 |
| 7199920 | Two stage optical amplifier The invention describes a two-stage optical amplifier adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifier in a way suitable for forming unidirectional and bi-directional configurations useful in optical net... | 04/03/2007 |
| 7187991 | Failsafe control circuit for electrical appliances Failsafe control circuit for electrical appliances whereby at least one electrical load (10) is activated, the control circuit comprising logic control means (1), operation switching means (8) between said electrical load (10) and a suppl... | 03/06/2007 |
| 7186033 | Fiber optic booster connector An apparatus includes a housing, a first connection interface and an optical amplifier. The housing receives a fiber optic line and an electrical line. The first connection interface is located at least partially inside the housing and is exposed outside of the hous... | 03/06/2007 |
| 7177074 | Circuit and method for safety shutdown of an optical amplifier A circuit and associated method for safety shutdown of an optical amplifier, wherein the power of an amplified spontaneous emission ASE is subject to a correction factor and subtracted from a measured signal extracted from the optical signal. ... | 02/13/2007 |
| 7164527 | Method, apparatus and system for controlling the effects of power transients in optical transmission systems A method, apparatus and system for controlling power transients in amplified optical transmission system includes, in response to the detection of a power transient in an optical signal, varying a gain of at least one amplifier to correct for a time delay in a gain ... | 01/16/2007 |
| 7161734 | Method and apparatus for controlling power transients in an optical communication system A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power. ... | 01/09/2007 |
| 7142785 | Light branching/inserting apparatus and light branching apparatus using wavelength selection filter A light branching/inserting apparatus which can easily control light signal wavelengths, and which can branch, insert or transmit light signals having an optional wavelength and optional multiplexed number, by using a wavelength selection filter utilizing acousto-op... | 11/28/2006 |
| 7068423 | Low cost flexible automated optical power management Circuits and systems for use in monitoring and adjusting an optical signal strength of an optical data transmission system. A closed feedback loop which automatically controls an optical device's output uses an analog operational amplifier based circuit instead of a... | 06/27/2006 |
| 7064890 | Optical amplifier and optical communication system including the same The present invention relates to an optical amplifier (TDFA) or the like comprising a structure for constantly keeping the power of outputted signal light and gain flatness even when the power or number of channels of input signal light fluctuates. In this op... | 06/20/2006 |
| 7034996 | Optical transmission apparatus An optical transmitter 11 outputs an optical signal, and an optical booster amplifier 12 amplifies the optical signal and sends the amplified optical signal to an optical fiber 101 forming an optical transmission line. When detecting an optical ... | 04/25/2006 |
| 7031606 | Method and system for monitoring performance of optical network The invention describes methods and systems for monitoring the performance of an optical network by introducing a fiber identification (FID) tag and/or bundle identification (BID) tag which are unique to the fiber section and to the bundle of fibers respectively. Th... | 04/18/2006 |
| 6985284 | Method, apparatus and system for controlling power transients in a Raman-amplified optical transmission system A method, apparatus and system for controlling power transients in a Raman-amplified optical transmission system includes, in response to the detection of a power transient in an optical signal, varying the gain of at least one dispersion compensating module (DCM) i... | 01/10/2006 |
| 6975448 | Automatic gain controller of optical fiber amplifier An automatic gain controller for controlling gain values of an optical fiber amplifier. The automatic gain controller includes a first opto-electric conversion unit for converting a portion of optical signals that are input into the optical fiber amplifier into elec... | 12/13/2005 |
| 6922532 | Optical performance monitoring for D/WDM networks A performance monitoring method for an optically amplified transmission system. The method provides the optical power at each amplifier site, taking into account the inaccuracies introduced by the SRS in the power estimation obtained with the current methods. An opt... | 07/26/2005 |
| 6917731 | Optical amplification module According to one embodiment of the present invention an amplification module comprises a housing containing a plurality of optical ports. This housing: (i) at least partially encloses at least one amplification medium, (ii) provides at least one position for at leas... | 07/12/2005 |
| 6912085 | Optical amplifier An optical amplifier amplifies a light signal inputted to an optical amplifier fiber and outputs an amplified light signal, by exciting the fiber with an excitation light. The optical amplifier can keep its output light level constant and stable and reduce the excit... | 06/28/2005 |
| 6894832 | Technique for adaptively controlling gain in an optical amplifier A technique for adaptively controlling a gain of an optical amplifier is disclosed. In one particular exemplary embodiment, the technique may be realized by a method comprising the steps of measuring an output power signal of the optical amplifier; computing a comma... | 05/17/2005 |
| 6847478 | Optical amplification apparatus using Raman amplification An object of the invention is to provide an optical amplification apparatus using Raman amplification, which can reliably judge an input interruption of signal light and can shut down the supply of excitation light in accordance with a judged input interruption of t... | 01/25/2005 |
| 6762878 | Gain control device and method for erbium doped fiber amplifier This invention provides a gain control device and method for an erbium doped fiber amplifier that is capable of maintaining a constant gain irrespective of the intensity variation of the input signal light. The gain control device includes: a pumping light source fo... | 07/13/2004 |
| 6757099 | Optical power transient control scheme for EDFA amplifiers An improved optical power transient control scheme is provided for optical amplifiers used in long haul, high capacity DWDM optical networks. The optical power transient control scheme employs a combination of feed-forward and feedback control mechanisms to adjust t... | 06/29/2004 |
| 6738184 | Optical amplifier for amplifying multi-wavelength light Optical signals (multi-wavelength light) are guided to an EDF. The EDF is supplied with pump light generated by a first and a second pump light sources. Dummy light is generated by a dummy light source and supplied to the EDF. The wavelength of the dummy light is sh... | 05/18/2004 |
| 6721091 | System and method for controlling optical amplifier pumps A system and method for controlling optical amplifier pumps. A path average intensity detector is provided for detecting a path average intensity for transmitted optical signals. In response to the detected path average intensity or a variation in path average inten... | 04/13/2004 |
| 6690508 | Control system and method for an optical amplifier A method and system for controlling the gain of the amplification of an optical signal is provided that includes both electrical feedforward and feedback. In a feedforward portion of an optical amplifier, the method includes receiving an optical signal an... | 02/10/2004 |
| 6678088 | Optical amplifier transient control apparatus An optical amplifier control circuit and method controls transients and avoids the problems associated with measuring gain. The input power level is detected and amplified by a transient control setting to provide a desired gain value against which is com... | 01/13/2004 |
| 6661570 | Optical amplifier, optical communication system including the same, and optical fiber module included in the same The present invention relates to an optical amplifier and the like comprising a structure for effectively suppressing transient output signal power fluctuations caused by delays in control. The optical amplifier including an amplification optical fiber co... | 12/09/2003 |
| 6621625 | Optical node including three-stage optical amplifier with automatic gain and level control An optical node and method for operation in an ultra long haul backbone network that provides DWDM optical transmission and wavelength networking functionalities are disclosed. The optical node is designed with capabilities for amplification, dispersion c... | 09/16/2003 |
| 6606189 | Light amplifier and light amplifying method In a light amplifier and a light amplifying method, a dummy light (saturated light) source 40 emits dummy light, a directional coupler 11 composes the dummy light with a light signal, and the composite light of the light signal and the dummy light is spli... | 08/12/2003 |
| 6606447 | Optical attenuator including dual control loops The present invention provides an optical attenuator comprising an optical attenuator module, an optical splitter, a detector and a control unit. Input radiation (Pi) is received at the attenuator module which is operable to attenuate the input... | 08/12/2003 |
| 6560008 | Controlling apparatus and controlling method for wavelength division multiplexing optical amplifier The present invention aims at providing a controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to the affection of noise light included in the monitoring light to be us... | 05/06/2003 |
| 6539153 | Light limiter The object of the present invention is to provide a light limiter which can control the generation of an optical surge, comprises few components, and has high reliability; in order to achieve the object, the light limiter of the present invention comprise... | 03/25/2003 |
