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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...
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6985285 |
Optical transmission system using Raman amplification
An optical transmission system that can reduce a difference of Raman gain between each of upstream and downstream lines, in a system configuration in which Raman amplification is performed for both...
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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,...
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6980747 |
Optically amplified receiver
An integrated, optically amplified receiver includes an optically pumped optical preamplifier for receiving, generally, wavelength division multiplexed optical communication signal over an optical...
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6980355 |
Wavelength-tunable amplified optical splitter
A signal may be split by a splitter into a plurality of output signals. Each of these output signals may then be amplified. Amplified spontaneous emission noise may be removed using a tunable...
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6980345 |
High speed optical signal processor including saturable absorber and gain-clamped optical amplifier
Disclosed is a high speed optical signal processor which includes a saturable absorber area including a substrate, an active layer, a clad layer and a first upper electrode which are sequentially...
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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...
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6975447 |
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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6975446 |
Optical amplifier, method for compensating for temperature dependency of gain flatness of an optical amplifier and optical transmission path including optical amplifier
An optical amplifier has a gain flatness which is maintained to be substantially constant regardless of temperature changes. The optical amplifier includes an EDF amplifying section and a Raman...
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6973268 |
Bi-directional optical transmission using dual channel bands
A bi-directional optical transmission system according to the present invention provides transport of x optical channels over n nodes. The system supports two-way transport of the x channels over a...
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6972898 |
Wide band optical fiber amplifier
Disclosed is a wide band optical fiber amplifier for amplifying C and L-band optical signal components having an economical configuration, high amplification efficiency while exhibiting a low noise...
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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...
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6963436 |
Method and device for waveform shaping of signal light
The method according to the present invention includes the steps of splitting an optical signal into first and second optical signals, increasing the pulse widths of the first optical signal to...
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6958857 |
Optical fiber component for Raman amplification, Raman amplifier and optical communications system
The present invention relates to an optical fiber component for Raman amplification having a construction for effectively suppressing deterioration of the transmission characteristic caused by...
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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...
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6954305 |
Optical amplifier and optical transmission system using it
An optical amplifier 1 is constructed using an amplification optical waveguide in which a first amplification optical fiber 10 and a second amplification optical fiber 20 are connected in...
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6950232 |
Gain clamped thulium-doped fiber amplification
An optical amplifier system is disclosed comprising a Thulium-doped fiber span, a pump system, and a feedback loop. The Thulium-doped fiber span receives input optical signals. The pump system...
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6943940 |
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...
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6943938 |
Tunable wavelength filter with invariant transmission and reflection beam angles
Improved designs of optical devices for processing optical signals with own or more specified wavelengths are disclosed. According to embodiment, a filter mirror assembly appears an “L” shape...
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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...
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6943935 |
Dispersion-managed cable for raman-assisted transmission
An apparatus for transporting an optical signal is provided. The apparatus includes sections of optical fiber span with at least one section negative dispersion, negative slope fiber positioned at...
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6941079 |
Optical demultiplexer with multi-channel power control and tilt compensation
Systems and methods for controlling power of WDM channels in a WDM receiver. A preamplifier is provided prior to a demultiplexer in the WDM receiver chain. The gain of the preamplifier may be...
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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...
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6934078 |
Dispersion-compensated erbium-doped fiber amplifier
Disclosed is dispersion-compensated erbium-doped fiber amplifier. The disclosed fiber amplifier comprises a first fiber amplifying unit, a second fiber amplifying unit arranged downstream from the...
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6934077 |
Optical communication systems including optical amplifiers and amplification methods
Optical systems of the present invention includes power sources that provide dedicated and shared power to a plurality of optical amplification sections. In various embodiments, multiple optical...
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6934076 |
WDM optical communication system
The invention concerns a method and apparatus for controlling the signal output power of an optical amplifier ( 100 ). A target output power utilised to monitor the amplifier output power comprises...
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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...
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6928203 |
Variable optical fiber grating and dispersion compensator
A variable optical fiber grating is provided which is compact, and in which an amount of chromatic dispersion can be effectively varied without changing an operating center wavelength. Also...
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6927897 |
Optical amplifier
A method of amplifying a signal light includes initially multiplexing a signal light and a pumping light, initially amplifying the signal light initially demultiplexing so as to separately output...
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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...
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6922280 |
Optical amplifying apparatus, optical add/drop multiplexer, and optical amplifying method
An optical amplifying apparatus is composed of a light amplifying part for amplifying light and an input light controlling part for inputting, to the light amplifying part, probe light that serves...
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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...
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6914718 |
Optical repeating system and optical amplifying repeater control method
In an optical repeating system including an optical transmitter and optical amplifying repeaters, the optical transmitter specifies one optical amplifying repeater, and transmits to the optical...
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6914717 |
Multiple wavelength pumping of raman amplifier stages
A nonlinear polarization amplifier stage includes a gain medium operable to receive a multiple wavelength optical signal. The amplifier further includes a pump assembly operable to generate a...
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6912084 |
Method and apparatus for controlling pump powers of broadband raman amplifiers used in optical transmission systems
A method and apparatus for controlling the pump powers of a broadband DWDM optical system using Raman amplification which determines pump settings that advantageously minimize the peak-to-peak...
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6909537 |
Dispersion compensator whose transmission band is flattened
Light input from a single-mode fiber is collected into linear light beams by a line focuser, and collected on a VIPA element. A light beam output from the VIPA element is made to pass through a...
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6909536 |
Optical receiver including a linear semiconductor optical amplifier
An improved optical receiver comprises a vertically lasing semiconductor optical amplifier (VLSOA) coupled to a photodetector. The VLSOA and photodetector are discrete devices or alternatively...
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6906856 |
Early warning failure detection for a lasing semiconductor optical amplifier
Optical systems and devices are provided that include or facilitate the ability to provide early detection of the failure of an optical transmitter such as a laser. Such detection may be made with...
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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...
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6903864 |
Method and apparatus for amplification of an optical signal
A method and apparatus for amplifying an optical signal in an optical network is provided. In an embodiment of the present invention, an optical amplifying module is disclosed for use in an optical...
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6903324 |
Optical amplifier amplifying wavelength multiplexed light, and wavelength multiplexed light communications system
Wavelength multiplexed light is amplified by first and second EDFs. Gains of the first and the second EDFs are respectively held to be predetermined values by first and second AGC circuits. Between...
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6900934 |
Inversion level controller and system for optical amplifiers
A control system and method for a multi-channel optical amplifier is provided that achieves and automatically maintains a selected gain level by controlling the average inversion level of the...
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6900932 |
Optical gain flattening filter using VPG-based optical elements
An optical gain flattening filter for attenuating the wavelength power levels of an optical beam to a threshold value. The filter has a series of volume phase gratings which each have a loss...
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6900931 |
Three-stage optical amplifier having flat spectral gain
A three stage optical amplifier is disclosed having a substantially flat gain profile. The amplifier includes a variable optical attenuator coupled between second and third stages of the amplifier...
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6900930 |
Method and apparatus of a semiconductor-based gain equalization device for optical amplifiers
A semiconductor-based gain equalization device, method and apparatus. In one aspect of the present invention, an apparatus according to an embodiment of the present invention includes a...
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6900929 |
Noise figure measuring system for optical amplifier
A noise figure measuring system including a first optical amplifier whose noise figure is to be measured, a plurality of light sources for outputting a plurality of optical signals having different...
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6900885 |
White light source
The present invention relates to a white light source. This white light source comprises a plurality of amplified spontaneous emission light generating sections each comprising at least an active...
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6898003 |
Dispersion-compensated Raman optical fiber amplifier
Disclosed is a dispersion-compensating, Raman optical fiber amplifier used in an optical communications system of the type having an optical transmission block for transmitting wavelength division...
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6898002 |
Optical device, optical module, optical amplifier, and optical transmission system
The present invention relates to an optical device and the like which can facilitate a fine adjustment for an optical waveguide type diffraction grating device. The optical device includes a...
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6898001 |
Noise figure-measuring device and noise figure-measuring method
Output light spectrum P 2 (λ) data from an optical amplifier and input light spectrum P 1 (λ) data of signal light are prepared, the difference between the P 2 (λ) and a value obtained by...
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