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6807000 |
Gain measurement device for optical amplifier and method thereof
The present invention provides a gain measurement device for an optical amplifier and measurement method therefore enable continuous measurement at high speed and high precision with quite simple...
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6804469 |
Supervisory system of optical amplifier repeater system and supervisory method of optical amplifier repeater system
A supervisory system and supervisory method of an optical amplifier repeater are proposed that can implement operation supervision taking account of the characteristics of individual supervisory...
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6804045 |
Optical chirped beam amplification and propagation
A short pulse laser system uses dispersive optics in a chirped-beam amplification architecture to produce high peak power pulses and high peak intensities without the potential for intensity...
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6798566 |
Variable optical gain equalizer and variable branching ratio beam splitter
A variable optical gain equalizer in accordance with one embodiment of the present invention comprises a variable branching ratio beam splitter having a variable polarization rotator, the variable...
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6798565 |
Method and arrangement for compensating for cross phase modulation
The cross phase modulation generated by a fiber amplifier is compensated for by converting the amplitude variations of the wavelength-division multiplex signal (WMS) into an electrical signal which...
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6795236 |
Cascadable optical amplifier arrangement
A cascadable optical amplifier arrangement having a modular base amplifier arrangement (BVA) that is constructed in single-mode technology and has at least one amplifier stage (VS 1 to VS 4 ). At...
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6795235 |
Optical transmission line, method of making optical transmission line, and optical transmission system
The present invention relates to an optical transmission line enabling Raman amplification of an optical signal when pumping light is supplied thereto, a method of making this optical transmission...
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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...
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6788844 |
All-optical dynamic gain equalizer
The present invention provides an all-optical dynamic gain equalizer of an open-loop design using nonlinear optical materials for equalizing channel power without the need of complex electronics...
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6785043 |
Dispersion-compensated optical fiber amplifier
Disclosed is a dispersion-compensated optical-fiber amplifier including a circulator for outputting an optical signal received at a first terminal to a second terminal, while outputting an optical...
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6778320 |
Composite optical amplifier
An optical signal amplifier includes a Raman fiber amplifier and a semiconductor optical amplifier. The Raman fiber amplifier utilizes a portion of the pump radiation to amplify the optical signal...
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6778319 |
Side-pumped multi-port optical amplifier and method of manufacture using fiber drawing technologies
A multi-port optical amplifier chip has an inner cladding layer sandwiched between a pair of outer cladding layers, a plurality of active core elements disposed substantially within the inner...
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6775057 |
Raman amplifier, optical repeater, and raman amplification method
A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from...
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6775056 |
Optical transmission systems including signal varying devices and methods
Optical systems of the present invention include a plurality of optical processing nodes in optical communication via a plurality of signal varying devices. A first signal varying device includes...
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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...
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6771413 |
Optical transmission systems including optical amplifiers, apparatuses and methods
Optical systems of the present invention include amplifiers configured to achieve maximum signal channel in a span downstream of the transmitter and amplifier site and to decrease the interaction...
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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...
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6768578 |
Optical amplifier for amplifying a wavelength division multiplexed (WDM) light including light in different wavelength bands
An optical amplifier, or optical repeater, for amplifying wavelength division multiplexed (WDM) light A first demultiplexer demultiplexes the WDM light into first and second lights corresponding to...
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6765716 |
Low noise optical amplifier and optical communication system using the same
A low noise optical amplifier used in an optical communication system includes optical amplifying elements for amplifying optical signals of a specific wavelength(λ) incident from their ends(F 1...
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6765714 |
System and method for measuring an amount of error associated with an optical amplifier
An optical signal having optical energy is received at an optical amplifier. The optical signal may be separated into a low frequency segment and a high frequency segment. The high frequency...
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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...
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6760150 |
Optical transmitting apparatus and an optical transmitting system
An optical transmitting apparatus having a first optical amplifier by which quality of an output optical signal after amplified is changed according to an amplification gain, a second optical...
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6760149 |
Compensation of polarization dependent loss
In a method of compensating polarization dependent loss (PDL) in a wave division multiplex (WDM) optical communications system, a performance parameter is monitored at a predetermined monitoring...
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6760148 |
Nonlinear polarization amplifiers in nonzero dispersion shifted fiber
A broadband fiber transmission system includes a transmission line with at least one zero dispersion wavelength λ o and transmits an optical signal of λ. The transmission line includes a...
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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...
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6757097 |
Wavelength dependent isolator
A wavelength dependent optical device comprising: at least two optical Ports ( 21, 22 ); a first series of polarisation modifying optical components ( 23, 25, 27, 28 ) placed between the two Ports...
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6751421 |
Optical fiber communication system employing wavelength converter for broadband transmission
The present invention uses wavelength conversion to increase the bandwidth of optical communication systems. In an exemplary embodiment, a combination of wavelength conversion and amplification...
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6751013 |
Gain-clamped semiconductor optical amplifiers with adjustable gain levels
Gain-clamped semiconductor optical amplifier devices are provided that have adjustable gain levels. Optical amplifiers and other network equipment based on the semiconductor optical amplifier...
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6751012 |
Method and apparatus for measuring noise figure in optical amplifiers
An apparatus for measuring the noise figure in optical amplifiers employed for large bandwidth applications such as dense wavelength division multiplexing systems. A booster amplifier coupled to a...
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6751011 |
Characteristic measuring method and characteristic measuring system of wavelength division multiplexing optical amplifier
The invention is directed to providing a characteristic measuring method and characteristic measuring system of a WDM optical amplifier that enables high speed and accurate measurement of...
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6748172 |
Multi-channel light source generator in a WDM optical communication system
A multi-channel light source generator has a pumping laser source for generating a pumping laser having a predetermined wavelength, a multi-channel light source generating device for generating...
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6748152 |
Optical transmission system
The optical transmission system in accordance with the present invention is an optical transmission system in which an optical fiber transmission line is laid between a transmitting station and a...
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6747791 |
Optical amplifier with a spectral gain monitor using a volume phase grating
An optical amplifier system for amplifying an input wavelength division multiplexed (WDM) optical signal with a first optical coupler to extract a portion of the power of the input signal, an...
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6747790 |
Optical amplifier for amplifying multi-wavelength light
Multi-wavelength light is inputted to an erbium-doped fiber as an optical amplification medium. Pump light is supplied to this erbium-doped fiber. When a transition from a state signal light on the...
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6747789 |
Laser amplifying system
In order to improve a laser amplifying system, comprising a solid-state member which has flat sides located opposite one another, is of a plate-like design and comprises a laser-active medium, a...
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6747788 |
Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier
The invention provides an optical fiber amplifier which assures stable operation of a pump light source and efficiently makes use of residual pump power to achieve improvement in conversion...
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6744989 |
Optical transmission system, its method, and optical amplification transmission line
An object of this invention is to improve transmission characteristics in WDM transmission. An optical transmitter ( 10 ) wavelength-multiplexes signal lights of wavelengths λ 1 through λn and...
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6744941 |
Optical wavelength tunable filter
The wavelength tunable optical filter ( 1 ) comprises a resonant cavity ( 4 ) delimited by two opposite reflective elements ( 8, 8′ ) which are not wavelength selective, and a reflector ( 7 )...
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6744556 |
Distributed Raman amplification system
In a distributed Raman amplification system, the pump laser and the fiber are chosen so as to have characteristics which result in broadening of the DRBS. For example, with a transmission fiber...
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6739727 |
Raman amplifier and pumping apparatus, and program
When Raman amplification is performed, the occurrence of lightwaves through FWM in a wavelength band of input signal light is suppressed, thereby avoiding deterioration of the signal quality....
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6738187 |
Semiconductor optical amplifiers using wavelength locked loop tuning and equalization
A system and method for improving optical signal gain efficiencies of semiconductor optical amplifier devices. The system and method exploits a wavelength-locked loop servo-control circuit and...
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6738183 |
Optical filter functioning as both a gain equalizer and noise-light blocking filter
The present invention relates to an optical filter and the like, applicable to a gain equalizer for equalizing the gain of an optical amplifier as well, comprising a structure enabling a repeater...
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6738182 |
Optical fiber amplifier
A signal light passes through an isolator, and is coupled by a coupler with a pump light from a pump light source. Then, the signal light passes through an ASE reflection filter, is amplified by an...
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6738181 |
Optical sending apparatus and channel extension method
An optical sending apparatus of this invention includes a plurality of optical signal generating sections, a dispersion compensating section and a wavelength multiplexing section. The dispersion...
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6735394 |
Per-channel optical amplification using saturation mode
An optical communication system includes a plurality of optical channels, each of which passes a single optical wavelength signal. Each of the plurality of optical channels includes an optical...
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6731424 |
Dynamic gain flattening in an optical communication system
An optical device for dynamic gain adjusting includes a dynamic gain adjusting filter having one or more semiconductor optical amplifiers. The dynamic gain adjusting filter may allow...
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6728273 |
Ultrashort-pulse laser machining system employing a parametric amplifier
A method and apparatus are provided for increasing the energy of chirped laser pulses to an output in the range 0.001 to over 10 millijoules at a repetition rate 0.010 to 100 kHz by using a two...
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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...
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6724527 |
Optical amplifier and optical transmission system using same
Disclosed are an optical amplifier and an optical transmission system using the same in which not only can the dispersion of optical waveguide paths for optical amplification be easily and...
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6724526 |
Inter-wavelength light power deviation monitoring method and optical equalizer and optical amplifier utilizing the method
It is aimed at providing an inter-wavelength light power deviation monitoring method capable of directly measuring the signal light power to thereby detect the light power deviations among channels...
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