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6721093 |
Method of amplifying optical signals using doped materials with extremely broad bandwidths
In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g.,...
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6717721 |
Large effective area erbium doped fiber optical amplifier
An optical waveguide amplifier fiber comprises a core region at least in part comprises Er 2 O 3 , Al 2 O 3 , GeO 2 and Ga 2 O 3 . The amplifier fiber also comprises an inner clad surrounding the...
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6714343 |
Power stabilization in an optical communication system
The invention concerns a method and apparatus for determining noise power caused by amplified spontaneous emission in a signal output by an optical amplifier ( 100 ). The amplifier is connected...
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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...
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6710916 |
Grating-based dispersion compensation devices
Fiber-based dispersion compensation elements are provided for use in optical amplifiers and other optical network equipment that handle optical data signals in fiber-optic communications links. The...
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6707962 |
Method for providing signal power tilt compensation in optical transmission systems
In one embodiment, the present invention provides a method of transmitting an optical signal. This signal is transmitted through an optical fiber 12 ( 24 ) and is amplified by an optical...
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6707600 |
Early warning failure detection for a lasing semiconductor optical amplifier
Early warning failure detetection is provided for an optical amplifier. The optical amplifier is based on a lasing semiconductor optical amplifier, which generates a ballast laser signal in...
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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....
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6700698 |
Multi-pass optical amplifier
A multi-pass optical amplifier system is provided comprising an amplifier medium ( 20 ) and at least one relay imaging telescope ( 18, 24 ) for imaging light from the amplifier medium onto a...
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6697189 |
System and method for gain equalization in an optical transmission system
It is disclosed a system for gain equalization in an optical communication system, comprising a fiber link with a two-stage EDFA with an inter-stage access, and in the inter-stage a Dispersion...
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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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6693740 |
Dispersion managed discrete Raman amplifiers
An optical amplifier comprises: (i) an input port for providing optical signal to the amplifier; (ii) an output port for providing amplified optical signal out of the amplifier; (iii) at least two...
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6693739 |
Method for gain equalization, and device and system for use in carrying out the method
The present invention relates to a method for gain equalization, for example. First, an optical transmission line including an optical amplifier having a gain changing nonlinearly with wavelength...
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6693737 |
Dispersion compensating nonlinear polarization amplifiers
A broadband nonlinear polarization amplifier includes an input port for inputting an optical signal having a wavelength λ. A distributed gain medium receives and amplifiers the optical signal...
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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...
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6690505 |
Optical network equipment with gain transient control and automatic drift compensation
Optical network equipment is provided. The optical network equipment may include equipment with optical gain stages such as optical amplifiers. The equipment may be used in fiber-optic...
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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...
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6687050 |
Amplifier gain error
An amplifying module 101 for an optical network has a fiber amplifier 102 for amplifying a multiplexed optical stream having a plurality of wavelength channels. The fiber amplifier 102 has a...
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6687046 |
Optical fiber amplifier device and communications system using the optical fiber amplifier device
The invention relates to an optical fiber amplifier device with an optical signal input and output with first piece of amplifying fiber doped with lanthanide in a double-clad structure, a second...
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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...
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6687044 |
Connection discovery for optical amplifier systems
Control information is embedded in the signal passing through an optical amplifier by varying the power level of that amplifier's pumped laser source. Connection discovery for a given optical port...
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6680793 |
Temperature-stabilized optical amplifier and method for temperature-stabilizing an optical amplifier
A temperature-stabilized optical amplifier ( 100 ) comprises at least an erbium-doped waveguide ( 101 ) for amplifying optical signals; at least a first and a second pump sources ( 103, 104 ) for...
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6680787 |
Optical communication systems
A return-to-zero pulse optical communication system includes fast saturable absorber means (F1,DSF) to provide substantially zero average dispersion in a single amplifier span (SIF,DSF) to reduce...
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6678441 |
Multireflector fiber optic filter apparatus and method
A multireflector fiber optic filter apparatus, wherein the transmittance and reflectance spectra are periodic in frequency, the apparatus comprising an etalon with N equally spaced reflectors...
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6678087 |
Optical amplifier and optical fiber communication system using the amplifier
An optical amplifier is implemented which can reduce its size and cost by using a smaller number of components. Signal light coupled by an optical combiner with pump light fed from a pumping light...
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6674568 |
Method and apparatus for achieving flat broadband Raman gain
A method and apparatus for receiving a gain profile from optical channel monitors (OMONs) and using that gain profile along with additional system parameters received from the OMONs for calculating...
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6674566 |
Raman amplification
An optical transmission system comprising a first optical waveguide suitable for transmitting a first information signal, a second optical waveguide suitable for transmitting a second information...
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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...
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6671086 |
Semiconductor optical amplifiers with broadened gain spectrum
Semiconductor optical amplifier with flattened or balanced gain across a spectrum of wavelengths. A gain balancing layer is formed on a semiconductor optical amplifier. The optical amplifier has an...
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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...
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6665115 |
Use of OPA for switching and routing in WDM networks
The present invention is an arrangement for utilizing optical information sent through an optical network from a sending site to at least one receiving site. An optical parametric amplifier OPA...
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6661567 |
Optical amplifier, optical amplifier hybrid assembly and method of manufacture
An optical amplifier is provided from a body 21 , at least part 25 of which is doped with a rare earth such as erbium. At least one waveguide 47 extends through the doped part of the body....
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6657779 |
Optical transmission system
Data transmitted on optical fiber over long distances is subject to the introduction of errors at the receiving end, caused by distortions and alterations of the original data. Raising the...
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6657778 |
Optical amplification repeater and optical amplification repeating and transmitting 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...
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6657774 |
Amplifier system with distributed and discrete Raman fiber amplifiers
An amplifier system includes: (i) a distributed Raman fiber amplifier and; (ii) a discrete Raman fiber amplifier that includes dispersion compensated fiber. The discrete Raman fiber amplifier is...
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6650797 |
Wavelength characteristics control device, gain equalizer and light amplifier
A wavelength characteristic control device capable of variably controlling a wavelength characteristic in a satisfactory manner. A polarized light wavelength characteristic changing element has a...
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6650467 |
Erbium-doped optical fiber amplifier using input optical signal filtering
Disclosed herein is an Erbium-Doped Fiber Amplifier (EDFA) used in a WDM (Wavelength Division Multiplexing) transmission system. In accordance with the present invention, a variation of the...
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6650400 |
Optical fibre amplifiers
An optical amplification system has an active fibre section having an optical fibre 10 and containment means 8, 12 containing light of a specific wavelength within the active fibre section. The...
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6646795 |
Optical amplifier
An optical amplifier for amplifying the channel signals of a WDM signal comprises an amplifier arrangement for amplifying a band of the channels. The amplifier arrangement comprises an amplifier (...
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6646792 |
Light amplifier and light transmission system using the same
An optical output signal of an optical amplifier 1 branched by an optical divider/splitter 2 is separated by an optical demultiplexor 3 into different paths □ 1 to □n in accordance with...
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6646791 |
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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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...
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6646789 |
Single parameter gain slope adjuster for an optical system
An optical device comprises an optical amplifier to amplify optical signals, optical pumps coupled to and providing optical pump power to least one amplifying stage of the optical amplifier, so as...
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6646788 |
System and method for wide band Raman amplification
A multi-stage Raman amplifier includes a first Raman amplifier stage having a first sloped gain profile operable to amplify a plurality of signal wavelengths, and a second Raman amplifier stage...
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6646786 |
Copropagating Raman pump unit to suppress four-wave mixing crosstalk between pump modes and WDM signals
Four-wave mixing crosstalk between co-propagating Raman amplification pump sources and WDM channels is suppressed. Therefore, co-propagating pumping may be applied to Raman amplification without...
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6643059 |
Optical array amplifier
An optical array amplifier has a first light beam shaper, a first waveguide to guide an input optical signal consisting of a plurality of wavelengths to the first beam shaper, a diffracter...
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6643057 |
Optical amplifier with reduced non-linear signal impairments by optimum pumping configuration and method for using same
A system and method for amplifying an optical signal within an optical waveguide amplifier including providing at least one optical waveguide amplifier having an input for receiving an optical...
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6643055 |
Optical amplifier control
A system and method for controlling the output power of an optical amplifier in a node in a network, wherein the output power of the amplifier is controlled via a pump laser in a control circuit....
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6639716 |
Wavelength division multiplexing optical communication system and optical amplifying device
The present invention aims at providing a WDM optical communication system adapted to avoid reduction of signal light power per one wavelength included in output light of an ALC operating optical...
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6636661 |
Optical signal interleaving comb filter with reduced chromatic dispersion and applications therefor
Optical signal interleaver/deinterleavers with reduced chromatic dispersion are described. In one embodiment, the interleaver/deinterleavers include two optical filters and an optical isolator...
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