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8107819 |
Systems and methods for interference prediction
An optical network device of a passive optical network is introduced. The optical network device includes a light source, a control unit, and a variable optical attenuator. The light source can...
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8107160 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Light output control apparatus
A light output control apparatus, includes: an excitation light source that outputs excitation light;an excitation light guiding unit that guides the excitation light to an optical amplifying...
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8068735 |
Transient control solution for optical networks
An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver...
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7872794 |
High-energy eye-safe pulsed fiber amplifiers and sources operating in erbium's L-band
An apparatus and that provide an optical-fiber amplifier having at least one erbium-doped fiber section and an optical pump coupled to the erbium-doped fiber section, wherein the apparatus is...
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7826746 |
Transient control solution for optical networks
An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver...
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7657041 |
Laser audio preamplifier, volume control, and multiplexer
A fiber optical audio preamplifier receives audio signals from an audio source, amplifies the audio signals, and transfers the signals to a power amplifier. The fiber optical audio preamplifier has...
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7444078 |
Transient control solution for optical networks
An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver...
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7440169 |
Method for amplifying a time-varying optical signal and optical amplification unit
A method for amplifying a time-varying optical signal comprising the steps of: generating an auxiliary optical signal the amplitude of which is chosen to be complementary to at least the envelope...
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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...
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7369300 |
Optical amplifier pre-emphasis and equalization method and optical communications system incorporating same
The present invention provides an optical amplifier pre-emphasis and equalization method that alleviates the optical amplifier gain ripple penalty experienced in conventional optical communications...
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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...
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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)...
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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...
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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...
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7072585 |
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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7058301 |
Apparatus and method for planned wavelength addition and removal in a wavelength division multiplexed system
A request method for performing optical power management to accomplish planned addition and removal of wavelengths in an optical communications system is disclosed, wherein each wavelength has a...
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7034993 |
Optical amplifier apparatus
The optical amplifier apparatus comprises an optical amplifier which amplifies an input signal light, an output detecting unit which detects an output level of the optical amplifier, an output...
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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...
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7010229 |
Optical transmission systems including optical amplifiers and methods
Optical transmission systems of the present invention include at least one optical amplifier generally including an optical signal amplifying medium supplied with pump power in the form of optical...
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7006278 |
Wavelength-division multiplexing optical transmission system and repeater station therein
Disclosed is a wavelength-division multiplexing optical transmission system in which an optical lossy medium, optical amplifiers and Raman amplifiers for compensating for loss in the optical lossy...
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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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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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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 of...
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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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6819480 |
Method and apparatus for controlling the extinction ratio of transmitters
A method and apparatus for modifying the extinction ratio of a modulated optical signal by adapting a modulator driver signal in response to differences in spectral regions of the modulated optical...
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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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6697188 |
Radiation power equalizer
The invention provides a radiation power equalizer for an optical communication system, the equalizer characterized in that it includes: (a) an optical demultiplexer (300) for partitioning...
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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...
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6600594 |
Intelligent variable optical attenuator with controller and attenuation calibration
A variable optical attenuation system has at least one variable optical attenuation device that receives a light signal, attenuates the light signal, and transmits an attenuated light signal. The...
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6583909 |
Optical communication system and optical signal control method therefor
An optical communication system according to the present invention includes an optical transmission device and a repeater. The repeater has an automatic level controller for performing average...
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6545799 |
Method and apparatus for optical system link control
A method for tuning and improving the performance of an optical communication system comprising al link that includes optical amplifiers and, optionally, active and/or passive optical components...
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6535330 |
Dynamic controller for a multi-channel optical amplifier
A dynamic controller for a multi-channel EDFA-type optical amplifier is provided that is capable of providing a substantially tilt-free output over a range of selectable gain set points. The...
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6535331 |
Wideband optical amplifier and wideband variable wavelength optical source
A wideband optical amplifier for amplifying an input optical signal of known wavelength in one of at least two bands of wavelength has a significantly small number of optical components and thus is...
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6421169 |
Optical fiber amplifier having variable gain
An optical amplifier device intended for WDM light signals comprises a preamplifier (3) and a power amplifier (11) of the optical fiber amplifier type, which are connected in series and have gain...
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6411430 |
Optical amplifier
In an optical amplifier having a plurality of rare earth doped optical fibers in a multi-stage, there are provided one or more optical variable attenuator means, and an attenuation amount control...
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6317254 |
Parallel optical fiber amplifier with high power conversion
A parallel optical fiber amplifier having a configuration in which a C-band silica-based erbium-doped fiber amplifier (EDFA) stage and an L-band EDFA stage are coupled together in parallel in such...
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6292291 |
Optical fiber amplifier having constant output power for each channel and amplifying method thereof
An optical fiber amplifier having constant output power for each channel including a first measuring unit for dividing an input light signal into a first light signal and a second light signal,...
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6246512 |
Optical amplifier
This is disclosed an optical amplifier comprising: an optical waveguide for amplifying signal light incident thereon and outputting thus amplified signal light while pumping light is being...
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6198570 |
Optical filter, manufacturing method thereof, and optical amplifier equipped with said optical filter
A method of manufacturing an optical filter that can restrain the wavelength dependence of the gain of an optical amplifier. The input signal light power, output power of pump light source (8), and...
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6169615 |
Wavelength division multiplex optical transmission apparatus
The present invention relates to a wavelength division multiplex optical transmission apparatus including an optical sending system having at least a plurality of optical sending sections to...
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6163399 |
Method and apparatus for suppressing transients in optical amplifiers
The invention is a transient suppression system for use with an optical amplifier having a specifiable total output optical power. The system measures the power in a filtered electronic version of...
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6151159 |
Optical amplifier for wavelength multiplex transmission
An optical amplifier for wavelength multiplex transmission is capable of reducing the gain difference of each wavelength. A pumping light source generates pumping lights to excite an optical fiber...
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6144486 |
Pump wavelength tuning of optical amplifiers and use of same in wavelength division multiplexed systems
The variables and parameters previously understood to affect the gain spectrum of an optical amplifier 13 were: (1) the wavelengths to be amplified; (2) the input power levels at those wavelengths;...
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6111686 |
Optical fiber amplifier
An optical fiber amplifier includes an input side wavelength combiner and an output side wavelength combiner arranged at an input side and an output side, respectively. An input optical signal is...
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6111688 |
Optical amplifier and system including the same
Disclosed herein is an optical amplifier including an optical amplifying medium, a pumping source, an optical filter, and a control unit. Signal light is supplied to the optical amplifying medium....
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6104526 |
Optical amplifier and a method of controlling the optical amplifier
In the optical amplifier of the present invention, a part of signal light inputted to an input connector is branched out by an optical coupler, whereby its power is detected by a light-receiving...
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6104733 |
Multi-stage optical fiber amplifier having high conversion efficiency
We have found that the conversion efficiency of a Er/Yb-doped cladding pumped fiber amplifier increases with increasing signal input power. Thus, preamplification of the input signal by means of an...
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6057959 |
Optical amplifier having substantially uniform spectral gain
An optical amplifier is disclosed having substantially uniform spectral gain. The amplifier comprises a variable optical attenuator coupled between first and second segments of active optical...
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6014248 |
Wavelength division multiplexed optical signal amplifier
A wavelength division multiplexed (WDM) optical signal amplifier which amplifies optical signals having different wavelengths with minimized deviations in their respective output power levels,...
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5914795 |
Method of and device for amplifying channels extracted from a wavelength division multiplex
To optimize the amplification in a device for extracting channels from a wavelength division multiplex, the following steps are carried out in succession: a first amplification step with a first...
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