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| Number | Title | Issue Date |
| 8174759 | Apparatus for gain control in optical amplifiers The invention relates to an apparatus for dynamically controlling the gain of an optically pumped optical amplifier, and the optical amplifier including such apparatus, which utilizes a multiplying digital to analog converter to implement a digitally adjustable anal... | 05/08/2012 |
| 8174758 | Optical amplifier An optical amplifier for amplifying light includes a light source for emitting pump light in accordance with current amount; a rare earth element doped optical fiber doped rare earth element, the rare earth element doped optical fiber pumped by the pump light from t... | 05/08/2012 |
| 7852550 | Optical amplifying apparatus The present invention provides an optical amplifying apparatus having: a CPU 11 for processing various signals; a plurality of circuits 17, 18 for controlling respective devices 4, 9 required for optical amplification; a first storing unit 14... | 12/14/2010 |
| 7777940 | Extreme chirped pulse amplification and phase control Methods and systems for optical chirped pulse amplification and phase dispersion, the system including an active dispersion controller for receiving an input optical pulse from a modelocked laser and controlling a third and fourth order dispersion property of the in... | 08/17/2010 |
| 7466478 | Optical-level control method, optical-level control apparatus and wavelength-multiplexing optical network An optical-level control apparatus includes a plurality of variable optical attenuators each used for attenuating an input optical signal included in a wavelength division multiplexing signal as a component having a specific wavelength by applying a variable attenua... | 12/16/2008 |
| 7437070 | Submarine observation apparatus and submarine observation system In each of a plurality of submarine observation apparatus (1 to n), a branching unit (63) branches fixed-wavelength light (λ1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the... | 10/14/2008 |
| 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 |
| 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 |
| 7342445 | Radio frequency power amplifier circuit and method A method (200) and radio frequency amplifier circuit (100) for adjusting a gain setting of a power amplifier (102) and a gain setting of a power amplifier driver (106) that form part of the radio frequency amplifier circuit (100). ... | 03/11/2008 |
| 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 |
| 7339723 | Optical transmission system, optical repeating apparatus, and quality supervising method An optical transmission system includes an optical fiber transmission line, one or more optical repeating apparatuses, an optical receiving apparatus, and a transferring route for transferring a supervisory signal based on a quality deterioration of an optical signa... | 03/04/2008 |
| 7340165 | Optical amplifying device An optical amplifying device disposed on a transmission path of a WDM signal includes an optical amplifier amplifying the WDM signal, a detecting unit detecting a change in a transmission wavelength count contained in the WDM signal and/or a change in light receivin... | 03/04/2008 |
| 7340174 | Programmable OADM with chromatic dispersion, dispersion slope and amplitude ripple compensation, and method A programmable optical add/drop multiplexer (OADM) implements add/drop function of optical signals from a number of cross-connected optical systems while treating issues of coherent cross-talk, chromatic dispersion, slope of dispersion and amplitude equalization. In... | 03/04/2008 |
| 7330651 | Optical amplifying apparatus, optical transmission system and method of adjusting optical transmission loss An optical amplifying apparatus connected mutually through an optical transmission line includes an optical detecting unit for detecting an input level of an amplified spontaneous emission (ASE) light, an optical amplifying unit for amplifying a signal light, and an... | 02/12/2008 |
| 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 |
| 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 |
| 7321727 | Method for network commissioning using amplified spontaneous emission (ASE) sources This invention provides a method for commissioning an optical network using internal Automatic Spontaneous Emission (ASE) light inherently present in the optical network as a light source (the ASE light source) for measuring losses inside and between nodes in the ne... | 01/22/2008 |
| 7315696 | Gain setting method in wavelength division multiplex transmission equipment Gain setting of a receiving amplifier, is performed by detecting the necessity of gain setting when a receiving amplifier is turned on, requesting WDM transmission equipment in a preceding station to output ASE light; in a WDM transmission equipment of the preceding... | 01/01/2008 |
| 7308208 | Gain monitoring method for optical amplifier and apparatus thereof An object of the invention is to realize a gain monitoring method for an optical amplifier and an apparatus thereof, capable of detecting a gain for a signal light regardless of a noise light generated inside the optical amplifier. To this end, in the gain monitorin... | 12/11/2007 |
| 7299859 | Temperature control of thermooptic devices A low power or passive optical apparatus provides temperature control of dynamic thermooptic devices and temperature-sensitive optical devices formed on the same substrate. The optical apparatus includes a variable heat transfer device with a conductive heat transfe... | 11/27/2007 |
| 7295365 | Optical gain flattening components, optical chips and optical amplifiers and methods employing same An optical component for gain-flattening multiplexed passband signals amplified with optical pump power, comprises a launch port optical waveguide operative to communicate multiplexed passband signals in a passband wavelength range and optical pump power in a differ... | 11/13/2007 |
| 7295780 | Apparatus for detecting peaks of wavelength-division-multiplexed light, and apparatus for controlling said light Disclosed is an apparatus for controlling wavelength-division-multiplexed light wherein overall power of wavelength-division-multiplexed light is rendered constant through control for uniformalizing the level of only one wave of maximum power, and wherein the levels... | 11/13/2007 |
| 7286283 | Optical fiber coupling arrangement Apparatus for optically pumping a clad amplifier fiber includes one or more transmission fibers arranged and configured to insert pump-light from a pump light source such as a diode-laser into the cladding of the amplifier fiber. The pump light propagates through th... | 10/23/2007 |
| 7283292 | Method and system for improved eye protection safety of distributed raman amplifiers A system and method for providing eye-safety protection during operation of distributed Raman amplifiers based on the application of continuous out-of-band amplified spontaneous scattering (ASS) monitoring in an optical communication network span coupled to the Rama... | 10/16/2007 |
| 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 |
| 7245423 | Reducing noise in a fiber amplifier using a cleaning optical signal A fiber amplifier system and method are provided for reducing noise produced by a fiber amplifier by combining an optical signal to be amplified with a continuous wave optical signal that stimulates ions in the fiber amplifier to reduce photons produced by spontaneo... | 07/17/2007 |
| 7233739 | Optical bit stream reader system An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided. The invention generally comprises generating and detecting a signal in... | 06/19/2007 |
| 7228076 | Method for remodulation of a modulated optical signal and device for remodulation and transmission system A method for remodulation of a modulated optical signal is disclosed which uses a disturbed line signal and an optical clock signal derived from the undisturbed original line signal modulated with the bitrate frequency feeding both signals in a Raman amplifying fibe... | 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 |
| 7212335 | Apparatus and method for amplification medium performance simulation, and optical amplifier An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signa... | 05/01/2007 |
| 7202997 | Optical amplifier and optical amplifier control method An optical amplifier includes first and second optical amplifier units, a variable optical attenuator optically coupled between the first and second optical amplifier units, a first control unit to control gains of the first and second optical amplifier units based ... | 04/10/2007 |
| 7189613 | Method and structure for metal-insulator-metal capacitor based memory device A process for integrally fabricating a memory cell capacitor and a logic device is disclosed. A first conductive layer and second conductive layer are formed above a semiconductor substrate with a logic region and memory cell region. A first photoresist layer is for... | 03/13/2007 |
| 7177540 | Method for upgrading an optical transmission system and an optical transmitter A transmission wavelength band in an optical transmission line is divided into a plurality of sub-bands and signal lights or an ASE dummy light is disposed per sub-band as a unit. The optical power of the ASE dummy light in each sub-band is controlled so as to reali... | 02/13/2007 |
| 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 |
| 7173756 | Optical amplification system for variable span length WDM optical communication systems An optical communications system includes a plurality of optical fiber spans. An optical loss of one of the plurality of optical fiber spans is different from an optical loss of another one of the plurality of optical fiber spans. At least one of the plurality of op... | 02/06/2007 |
| 7167491 | Eye diagram improving method for laser transmitter A laser transmitter includes an input stage generating an input signal to a limiting amplifier, the limiting amplifier generating an input signal to a laser driver, and the laser driver generating an input signal to a light source. The limiting amplifier has a contr... | 01/23/2007 |
| 7167614 | Self-adapting limiter A limiter for limiting selected frequency components by generating Stokes waves in a stimulated Brillouin scattering medium. The generated Stokes waves create a seed that is provided to another stimulated Brillouin scattering medium. The seed selecting the undesired... | 01/23/2007 |
| 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 |
| 7161426 | RF power amplifier system having a plurality of different power control modes A multiple mode RF power amplifier system is presented having N different power control modes for controlling the level of the output RF power relative to applied input power. The system includes a mode controller that receives one of N different mode select command... | 01/09/2007 |
| 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 |
