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6275328 |
Amplifier control
A method and apparatus for determining control signals of a filter for optimization of the gain profile of an amplifier, particularly though not exclusively for use in optical communications...
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6271962 |
System of controlling wavelength division multiplexed optical amplifier and method thereof
A wavelength division multiplexed optical amplifier controlling system and method. The wavelength division multiplexed optical amplifier controlling system includes an optical exchange system for...
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6268955 |
Optical amplifier and wave length division multiplexed light transmission system
An object is to provide a low cost optical amplifier having a simple construction where gain equalization of wavelength division multiplexed signal light, and the suppression of noise light is...
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6268954 |
Method and system for controlling the slope of an output response
This invention relates to a method for filtering and to a variable slope optical filter for in-line use with an optical amplifier signal. The filter has a wavelength response that is substantially...
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6266180 |
Optical fiber amplifier using optical fiber having a portion which suppresses nonlinear optical phenomena
An optical amplifier which suppresses the occurrence of a nonlinear optical phenomena, such as four-wave mixing. The optical amplifier includes an optical fiber doped with a rare earth element, and...
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6262835 |
Optical amplifier unit control methods, optical amplifier systems and systems which use the methods and amplifier systems
An optical amplifier controlling method and optical amplifier system which are simple in composition, maintain the S/N ratio of an optical signal output, have high control responsiveness, suppress...
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6259556 |
Optical fibre amplifier having a controlled gain
An optical fiber amplifier for WDM-signals comprises an active optical fiber pumped with pumping light from a pump source. In order to give the amplifier a constant gain for the WDM-signals...
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6259555 |
Multi-band amplification system for dense wavelength division multiplexing
An optical transmission system has been designed to optimize the use of the spectral emission range of rare-earth-doped fiber amplifiers. The system includes a wide band of channels in the spectral...
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6259554 |
Optical amplifier repeater system
A repeater station 10 detects whether or not an abnormality exists in each of signal light and monitor light having arrived from a terminal station 1 or a repeater station 20, and controls,...
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6259553 |
Optical communication system and optical amplifier
An optical communication system having a transmitting station for outputting WDM (wavelength-division multiplexing) signal light, an optical fiber transmission line, a receiving station, and an...
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6256141 |
Optical amplification apparatus
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective...
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6256138 |
Fiber filter to improve return loss at signal band of a fiber amplifier for pump laser modules
A fiber filter for use in an optical amplifier communication system is in the form of an optical fiber connected between a laser pump module and an amplifier. In one preferred embodiment, the...
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6252701 |
Optical fiber amplifier
An optical fiber amplifier includes a signal light source integral with an exciting light source. The optical fiber amplifier has a Fabry-Perot semiconductor laser element having a light emitting...
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6252700 |
Erbium doped fiber amplifier suitable for long wavelength light signal
An erbium doped fiber amplifier (EDFA) suitable for amplifying a long wavelength light signal in the range in the 1570 to 1610 nm band, includes a pump light source for generating pump light in the...
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6252699 |
Device with optical fibre amplifier
A device with an optical fiber amplifier, wherein a control circuit is provided for stabilizing the amplification. In the control circuit, a supplemental optical signal (z) is supplied to the input...
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6246513 |
Optical amplifier with optimal gain excursion for different input powers
The invention relates to optical fiber apparatus comprising an amplifier having optimal gain excursion over a given wavelength band for given input power, and a filter having a bell-shaped transfer...
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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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6246511 |
Apparatus and method to compensate for optical fiber amplifier gain variation
A system is provided for partially or completely offsetting optical fiber amplifier gain spectrum variations due to temperature by setting the optical pump signal leading into the amplifier to a...
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6246510 |
Light amplification apparatus with automatic monitoring and controls
A light amplification system for amplifying a selected wavelength of light used for communicating information signals and having a microcontroller for substantially automatic start-up and shutdown...
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6240224 |
Coated optical fiber
A coated optical fiber comprises a coating, an optical fiber, at least one waveguiding region and an index grating. The waveguiding region contains at least one photosensitive region, the index...
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6239903 |
Nonlinear fiber amplifiers for a 1430-1530nm low-loss window in optical fibers
An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel...
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6239902 |
Nonlinear fiber amplifiers used for a 1430-1530nm low-loss window in optical fibers
An apparatus and method are described for exploiting almost the full almost 25 TH % of bandwidth available in the low-loss window in optical fibers (from 1430 nm-1620 nm) using a parallel...
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6236500 |
Optical amplifier
There is provided an optical amplifier for reducing the optical output power difference and/or obtaining high output power across a wide wavelength band. The optical amplifier comprises a plurality...
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6236498 |
Upgradable, gain flattened fiber amplifiers for WDM applications
A multistage optical fiber amplifier (OFA) system is designed to be upgraded with the addition of pump power when signal capacity of an optical communication link is correspondingly increased. The...
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6236497 |
Direct free space pump signal mixing for EDFA
An erbium doped fiber amplifier includes a wavelength division multiplexer (WDM) which receives a data signal having a first wavelength through a first optical fiber which is single-mode at the...
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6236495 |
Optical dispersion compensation
The present invention relates generally to the field of optical communication and particularly to optical communication techniques which compensated for dispersion such as that in optical fibers....
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6233092 |
Management and utilization of ASE in optical amplifier
An amplification stage of a multistage, rare earth doped optical amplifier, having a gain spectrum including a shorter wavelength band and a longer wavelength band, provided with excitation light...
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6233090 |
Optical amplifier
An optical amplifier with improved output power and reduced noise is disclosed. A first optical fiber amplifier is pumped by a first pumping light and a second optical fiber amplifier is pumped by...
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6233078 |
Photo signal amplification transmission system
In a conventional photo signal amplification transmission system, since control is performed to make constant an output power, total output powers of all wavelengths are made constant when a...
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6229641 |
Optical amplifier, method of controlling the output light from the optical amplifier, optical transmission system and method of controlling an optical transmission path cross reference to related application
An optical transmission path monitoring and controlling method including the steps of monitoring a probe light beam and other multiplexed light beams which are included in a multiplex light ray...
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6226117 |
Noise figure measurement of optical amplifiers by power substitution
Described is a noise figure measurement for optical amplifiers by disabling a signal of a channel before the measurement of the amplified spontaneous emission for that channel and by distributing a...
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6222670 |
Long-band optical fiber amplifier with enhanced power conversion efficiency
A long-band optical fiber amplifier with enhanced power conversion efficiency including a first optical fiber part provided with a pumping light source, a second optical fiber part connected with...
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6222669 |
Optical partial regeneration of solitons
A partial optical regenerator for use in high bit-rate optical systems and useful in WDM applications employing soliton transmission. The regenerator essentially comprises a saturable optical...
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6222668 |
Fast loss of signal (LOS) detection for bidirectional optical amplifiers
A fast means of detecting that a fiber has been disconnected at one end of a bidirectional optical amplifier by monitoring for several signature effects simultaneously. Upon detection of a loss of...
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6215584 |
Input independent tilt free actively gain flattened broadband amplifier
A broadband optical amplifier that can provide a constant amplifier gain profile, correct for ASE noise, and minimize gain tilt by dynamically controlling different stages of the amplifier through...
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6215581 |
Performance gain flattened EDFA
The invention is directed to a multistage optical amplifier having a gain stage between a GFF and an optical attenuator. More specifically, in accordance with an illustrative embodiment of the...
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6212002 |
Optical amplifier
The invention provides an optical amplifying system having a structure with two amplification levels to amplify received optical signals. The optical amplifying system includes a Michelson...
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6212001 |
Method and system for controlling optical amplification in wavelength division multiplex optical transmission
The present invention relates generally to the field of optical transmission and particularly to a method and a system for controlling optical amplification in wavelength division multiplex optical...
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6205268 |
Arrangement of optical fiber segments for minimizing effect of nonlinearities
A high-capacity optical fiber network [100, 200] includes wavelength-division multiplexing (WDM) within the 1.4 micron (μm) wavelength region (i.e., 1335-1435 nm). Such a system includes optical...
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6204960 |
Quasi-distributed amplification in a fiber optic soliton signal transmission system
The invention concerns a wavelength-division multiplex soliton signal fiber optic transmission system; to reduce the effects of collision jitter on the soliton channels, it proposes...
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6204959 |
Signal light monitor and optical amplifier using the same
A signal light monitor having a first optical branching coupler disposed in an optical fiber transmission line for branching a part of an inputted signal light and outputting a first branched...
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6204958 |
Optical amplifier having a substantially flat gain spectrum
An optical amplifier is provided in which optical channels, each at a respective wavelength, make two passes through a segment of erbium-doped optical fiber. After the first pass, certain optical...
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6201636 |
Gain control unit and optical amplifier having temperature compensating function
A stabilized gain temperature compensated optical amplifier having automatic gain control and automatic level control. An optical amplifier with a temperature dependent gain wavelength...
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6201635 |
Optical amplifier
The invention relates to an optical amplifier; more particularly, the invention provides an optical amplifier that contains a front-end optical amplifier and a back-end optical amplifier, and that...
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6198572 |
Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied
An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The...
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6198571 |
Computerized intelligent optical amplifier for multi-channel optical networks
An optical amplifier having a substantially flat response over a multi-channel bandwidth for signals which have different input levels. It utilizes input and output photodetectors for detecting...
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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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6198569 |
Multiple window dense wavelength divison multiplexed communications link with optical amplification and dispersion compensation
Fiber optic communication links are disclosed, employing non-invasive fiber optic amplification technology. An amplifier stage is provided having a plurality of signal paths into which differing...
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6198568 |
Use of Chirped Quasi-phase-matched materials in chirped pulse amplification systems
The limitations on maximum pulse energies from a fiber-grating pulse compressor are circumvented by placing a chirped-period quasi-phase-matched (QPM) crystal after the fiber-grating pulse...
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6195480 |
Optical transmission device and optical transmission system employing the same
An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit, and a first buffer light...
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