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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...
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...
7324268 Optical signal amplifier and method  
An optical amplification apparatus is provided comprising a plurality of fiber amplification media segments which are concatenated in series wherein subsequent to each fiber amplification media...
7221499 Frequency scanned array control system  
An optical fiber amplifier array and related method, in which high beam quality is achieved by varying the frequency of an input signal applied to all of the fiber amplifiers, to locate a frequency...
7202996 Optical amplifier  
For setting the optical gain of an optical amplifier such as a Raman amplifier that is connected in a wavelength division multiplexing (WDM) system, the gain of the amplifier is made dependent on...
7170673 Optical amplifying repeater apparatus and optical amplifying/repeating transmission system  
Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of...
7170672 Raman amplifier  
A Raman amplifier for amplifying WDM radiation propagating along an optical fiber, the WDM radiation comprising a plurality of radiation components each having a selected waveband, comprises a...
7123404 Optical amplifier and optical amplification method  
An optical amplifier includes an output unit that outputs a loss monitoring light having a wavelength that causes neither absorption nor gain with respect to each of the wavelengths of a light...
7119950 Amplification method and optical amplifier for wavelength division multiplexed signal light  
In an optical amplifier of the invention, a WDM signal light is separated into N components by a demultiplexer after which each component is amplified by N optical amplifier sections, and the...
7116908 Optical transmission system for substantially equalizing the output signal level among frequency bands and substantially lowering the signal-to-noise ratio  
In the WDM systems, the OSNR and the signal loss among the optical signals are substantially minimized at the receiving terminal to combat the SRS effects. An equal amount of the signal loss is...
7092148 Optical communication system having dynamic gain equalization  
An optical communication device, and related method, are provided for reducing ripple in WDM systems. In particular, the optical communication device includes a dynamic gain equalization (DGE)...
7081988 Optical amplifier, communication system and method for control tilt of a communication system  
The invention discloses an optical amplifier ( 18 ) that amplifies signal light in a signal band in a fiber optic transmission system ( 10 ) having at least first and second optically pumped signal...
7081987 Coordinated control of dynamic gain equalization in a wavelength division multiplexed optical system  
A coordinated method is provided for controlling dynamic gain equalization in an optical transport network. The method includes: detecting a deviation in optical power of an optical signal...
7057802 Optical amplifier device  
The optical amplifier apparatus comprises an optical amplifier ( 3 ) which amplifies an input signal light, an output detecting unit ( 5 ) which detects an output level of the optical amplifier, an...
7046429 Method and system for span optical power control  
There is proposed a method and a module for real time control of power per optical channel in a multi-channel optical communication line formed by a group of optical elements connected in a chain...
7038843 Method and system for reducing Raman gain tilt error  
A method and system in accordance with the present invention greatly reduces the gain error due to Raman gain tilt for individual channels in an optical communication system during a transient...
7027217 Optical pulse generator and optical pulse testing instrument and method  
An optical pulse testing apparatus incorporating an optical pulse generator composed of low cost components. The optical pulse testing apparatus comprises: a ring optical path including an optical...
7009761 Power tilt compensation using automatic power balance control  
A method for correcting power tilt in an optical signal includes tapping off a representative portion of an optical signal and separating the representative portion into a first signal and a second...
6992816 Apparatus and method for gain-spectrum-tilt compensation in long-wavelength band dispersion-compensating hybrid fiber amplifier  
The present invention provides an apparatus and method for compensating for the variation of a gain spectrum attributable to the temperature variation of a fiber amplifier, and a long-wavelength...
6977770 Optical amplifier and control method therefor  
The optical amplifier according to the present invention includes a first optical amplifying unit, a second optical amplifying unit, a variable optical attenuator optically connected between the...
6972895 Long-wavelength optical fiber amplifier  
An optical fiber amplifier is disclosed for amplifying an input optical signal in the long wavelength band. The amplifier include first and second pumping light sources, a photo detector for...
6958856 Raman amplifier, raman amplifier control method, and optical communication system  
The present invention provides a Raman amplifier and the like comprising a structure for keeping the flatness of power spectrum of Raman-amplified signal light. The Raman amplifier comprises an...
6943937 Optical amplifier performance controller and method of use  
A controller for an optical amplifier and a method for controlling an optical amplifier are disclosed. The illustrative method includes inputting a set-point to a controller; receiving a portion of...
6937387 System and method for automatic recovery from a control loop failure  
A voltage potential at a selected one or more inputs is controlled in order to produce a gain associated with an optical amplifier. One or more characteristics associated with a feedback loop...
6931196 Optical device including dynamic channel equalization  
An optical device including dynamic channel equalization is provided. In an exemplary multiplexer or line amplifier configuration the device includes a plurality of separate optical paths, each of...
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...
6917467 Optical amplifier  
A programmable amplifier 100 operable to independently adjust the amplification given to various optical signals passing through an optical fiber. An input optical fiber 102 provides a number...
6906854 System and method for controlling noise in raman amplifiers  
A system and method for controlling noise in a Raman amplifier including a plurality of pumps. A control system provides one or more control signals in response to an amplifier input or output...
6873456 Optical amplifying repeater apparatus and optical amplifying/repeating transmission system  
Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of...
6867909 Filter with variable transmission character, optical transmission equipment and method of optical transmission  
In order to obtain optical transmission equipment for wavelength division multiplexing for providing a small inter-wavelength deviation regardless of a change in an input level, an amplification...
6865017 Optical fiber amplifier with error correction  
Methods and apparatus for amplifying a signal are provided. In one aspect, a method is provided for amplifying an optical signal using an EDFA and includes amplifying an input signal using an EDFA...
6791745 Optical communication system  
An amplifier arrangement includes an optical amplifier ( 10 ) with a source of injected power ( 11 ) for controlling amplifier gain. A feed forward gain control loop is provided with a weighting...
6775055 Raman amplifier  
Raman amplification pumping light output from a pumping light source unit is supplied to a Raman amplification optical fiber through an optical circulator. The remaining Raman amplification pumping...
6768579 Optical amplifier arrangement having a variably settable attenuator  
An optical amplifier arrangement having at least one optical amplifier stage (V 1 , V 2 ) and a variably settable attenuator (VDL), whose attenuation spectrum (DV 2 , DV 3 , DV 5 , DV 6 ) assumes...
6760532 Optical device having dynamic channel equalization  
An optical device including dynamic channel equalization is provided. In an exemplary multiplexer or line amplifier configuration the device includes a plurality of separate optical paths, each of...
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...
6728026 Dynamically tunable optical amplifier and fiber optic light source  
An optical amplifier comprises a wavelength tunable filter, one or more optical gain stages, and a controller for controlling a spectral profile of the wavelength tunable filter in response to a...
6711309 Noise suppression in lightwave communication systems  
An optical communications system comprises, among other things, a laser source; an optical waveguide interconnected to the laser source to carry an optical signal from the source to an optical...
6707599 Optical network equipment with triggered data storage  
Optical network equipment is provided. The optical network equipment may include optical amplifiers. Control units may be used to control components in the equipment such as gain stage pump lasers....
6690506 Control architecture and method for optical amplifiers  
According to an illustrative embodiment of the present invention, a method for controlling an optical amplifier is disclosed. The illustrative method includes receiving a portion of an input signal...
6690504 System and method for controlling spectral distribution of output power in a Raman amplifier  
A system and method for controlling gain shape in a Raman amplifier including a plurality of pumps. The pumps produce a spectral distribution of output power characteristic. A feedback control...
6687045 Variable gain optical amplifier and control method  
A variable gain optical amplifier and method for control thereof is provided that includes an amplifier stage having a light pump, and a power source for the pump, and a variable optical attenuator...
6674559 Optical automatic gain control based on stable, non-absorbing optical hard limiters  
Optical automatic gain control (AGC) is accomplished using stable, non-absorbing optical hard limiters and various optical logic gates derived therefrom. The AGC mechanism preserves the ratios...
6671085 Switchable dynamic gain-flattened optical amplifiers and methods with wide dynamic gain range  
A switchable dynamic gain-flattened optical amplifier with wide adjustable gain range is provided. Optical signals are amplified through common amplification such that the gain is approximately...
6646790 Optical amplifier gain control monitoring  
In a method and apparatus for tracking dynamic characteristics of an optical amplifier, optical signal probes are used to determine the gain and the corner frequency of the optical amplifier. A...
6633430 Booster amplifier with spectral control for optical communications systems  
An optical amplifier for fiber-optic communications systems is provided. The optical amplifier may have variable optical attenuators for adjusting the power on each of multiple input channels. A...
6621621 Line amplification system for wavelength switched optical networks  
A line amplification system connected on the fiber between two flexibility sites of a wavelength switched network is built with a number of modules that can be arranged in a line amplifier,...
6614589 Method and system for controlling amplifier power in an optical communications network  
The invention includes a method for controlling amplifier output power in an optical communications network. A first transmission parameter is determined at a first amplifier. In an exemplary...
6611374 Optical amplifier controller having adjustable slew-rate limiter  
A method and apparatus is provided for controlling the optical output power from an optical amplifier arrangement. The arrangement includes a rare-earth doped fiber for imparting gain to an optical...
6611370 Raman amplifier system, apparatus and method for identifying, obtaining and maintaining an arbitrary Raman amplification performance  
A Raman amplifier, system and method using a plurality of pumps configured to pump light into an optical fiber so as to Raman-amplify an optical signal propagating through the optical fiber. The...
Matches 1 - 50 out of 109 1 2 3 >