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6894830 |
Bi-directional optical-amplifier module
Disclosed is a bi-directional optical-amplifier module including first through fourth optical amplifiers, a mid-stage device for performing a desired signal processing for an upward or downward...
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6894829 |
Optical amplifier modules
A variable gain optical amplifier, in which homogeneous gain broadening is dominant, has first and second fixed gain rare-earth doped optical waveguide amplifiers ( 21, 23 ) optically in series...
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6894828 |
Power scalable waveguide amplifier and laser devices
The present invention is directed to guided wave systems, beam transport and waveguide techniques. The invention may comprise passive or active, hollow and dielectric core self-imaging mode wave...
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6893721 |
Process for the reduction of undesirable outgassing species
A method to reduce undesirable outgassing includes bonding at least two optical components with a bonding material and encapsulating the bonding material with a capping material. The capping...
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6891663 |
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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6891662 |
Optical amplifier and method for amplifying wavelength multiplexed transmission signal light
A rare earth element doped fiber forming an optical amplifier is pumped with a plurality of pumping lights to prevent drop of the inversion population ratio in the length direction of the rare...
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6888670 |
Hybrid-type low-noise dispersion compensating optical fiber amplifier
A low-noise optical fiber amplifier for performing a long-distance optical transmission in a wavelength division multiplexing optical transmission apparatus is provided. This amplifier includes a...
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6885499 |
Optical amplifying apparatus for amplifying wide-wavelength-band light, optical sending apparatus, optical transmission system, and optical amplifying method
There are provided a plurality of optical adjusting sections, a wavelength-multiplexing section, and a control section. The plurality of optical adjusting sections, which are provided for...
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6882467 |
Raman amplification method and optical signal transmission method using the same
First pump light for Raman-amplifying optical signal is inputted to the output end of the optical signal, and second pump light used for Raman-amplifying the first pump light and having a...
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6882466 |
Optical amplifier
An optical amplifier is provided for performing amplification of optical signals of two wavelength bands, where deterioration in the optical SN ratio relative to one wavelength band is reduced,...
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6876488 |
Discrete amplification of an optical signal
A discrete optical amplifier system is disclosed comprising a Dispersion Compensating Fiber (DCF), a first order pump system, and a second order pump system. The first order pump system is set to a...
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6873457 |
Optical amplifier, excitation light source control method for use in optical amplifier, and optical amplifier control method
An optical amplifier for use in, for example, a wavelength multiplexing optical communication system, in order to allow an excitation light source to be enlargeable or removable in accordance with...
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6873456 |
Optical amplifying repeater apparatus and optical amplifying/repeating transmission 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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6873455 |
Optical amplification apparatus utilizing raman amplification and controlling method thereof
The present invention aims at providing an optical amplification apparatus for improving noise characteristics by controlling an amplification operation by assuming a noise figure of the overall...
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6870666 |
Controlling apparatus and controlling method for wavelength division multiplexing optical amplifier
A controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to noise light included in the monitoring light. The...
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6867909 |
Filter with variable transmission character, optical transmission equipment and method of optical transmission
In order to obtain optical transmission equipment for wavelength division multiplexing for providing a small inter-wavelength deviation regardless of a change in an input level, an amplification...
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6867908 |
Optical amplifier having various control circuitry
The optical amplifier according to the present invention is constructed such that the amount of the electric current fed to the power feeding line 2 a is first detected by the current detection...
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6867905 |
Reduced four-wave mixing and raman amplification architecture
Raman amplifiers with improved signal to noise ratio and four-wave mixing product suppression are provided. In one embodiment, both co-propagating and counter-propagating pump energy are employed...
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6865018 |
Multistage optical amplifier having a fiber-based amplifier stage and a planar waveguide-based amplifier stage
A multistage optical amplifier includes a fiber amplifier stage having an active optical fiber for imparting gain to an optical signal propagating therethrough and a coupler supplying pump energy...
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6865017 |
Optical fiber amplifier with error correction
Methods and apparatus for amplifying a signal are provided. In one aspect, a method is provided for amplifying an optical signal using an EDFA and includes amplifying an input signal using an EDFA...
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6865016 |
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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6865015 |
Method and transmission system for optimization of the transmission characteristics of an optical wavelength division multiplex system
In the case of broadband optical transmission, the quality of a wavelength division multiplex (WDM) signal which has a number of channels is adversely affected by different channels levels or...
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6862136 |
Hybrid optical transmitter with electroabsorption modulator and semiconductor optical amplifier
An optical radiation amplifier, including an input port which receives the optical radiation and a first semiconductor optical amplifier (SOA), which is coupled to receive the optical radiation...
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6862135 |
Raman amplifiers with improved signal power management
An optical link comprises a first optical amplifier having a first gain spectrum with a first gain ripple and a second optical amplifier having a second gain spectrum with a second gain ripple. A...
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6859307 |
Method and device for waveform shaping of signal light
Disclosed herein is a method and device for waveform shaping of signal light. The method includes the steps of providing a waveform shaper for waveform shaping input signal light and outputting...
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6859306 |
Method, apparatus and system for reducing gain ripple in a raman-amplified WDM system
A method, apparatus and system for reducing gain ripple in a Raman-amplified WDM system includes determining a gain profile of an optical signal transported via a first Raman amplification span in...
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6856737 |
Nonlinear optical device
There is provided a non-linear optical device for enhancing the bandwidth accessible in the nonlinear generation of an optical signal. The device comprises a planar optical waveguide, the planar...
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6856454 |
Dynamic optical spectral control scheme for optical amplifier sites
A method for dynamically compensating for signal loss and dispersion in an optical signal traversing though an optical network. The method includes providing a dynamic gain equalization filter...
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6853479 |
Apparatus and method for coupling light between an optical resonator and a semiconductor chip with a minimum number of components and alignment steps
A system includes an electro-absorptive modulator having opposing surfaces, a first semiconductor optical amplifier having opposing surfaces, a photodetector having opposing surfaces, a second...
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6847758 |
Method, optical device, and system for optical fiber transmission
The present invention relates to a method for optical fiber transmission which can increase a transmission distance. A first optical fiber having dispersion is first provided. An optical signal is...
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6847479 |
Variable blazed grating
In one aspect of the invention, an apparatus operable to provide optical signal processing includes an inner conductive layer including an at least substantially conductive material and a plurality...
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6839162 |
Optical amplifying apparatus and optical communication system
The present invention relates to an optical amplifying apparatus and a complex optical amplifying apparatus which compensate a loss as a function of wavelength of an optical transmission line by a...
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6839161 |
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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6839160 |
Method of activating optical communication system, channel increasing/decreasing method, and computer-readable recording medium
The invention relates to a method of activating an optical communication system comprising a plurality of optical amplifiers having an optical amplifier, between optical transmission lines in which...
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6836588 |
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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6833948 |
Method for implementing power equalization of dense wavelength division multiplexing system
The invention discloses a method for implementing power equalization of a DWDM system, comprises: Measure and calculate, respectively, a gain spectrum characteristic curve of an optical power...
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6829549 |
Implementation of a post detection chromatic dispersion compensation transfer function
A method and apparatus for compensating, in the electrical domain, for chromatic dispersion of an optical signal is disclosed. An optical signal is converted to an electrical signal comprised of...
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6829410 |
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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6829083 |
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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6829053 |
Airgap type etalon and apparatus utilizing the same
An airgap type etalon has a higher degree of design freedom of a wavelength-temperature characteristic so that such a wavelength-temperature characteristic can be freely adjusted. The airgap type...
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6822972 |
Bidirectional communication system with ring configuration
A broadband communication system includes headend equipment for transmitting downstream signals and for processing upstream signals and communication devices coupled to one another in a...
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6822786 |
All fiber gain flattening optical filter
An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding, and an outer cladding. A core index of refraction is greater than an...
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6819875 |
Optical wavelength multiplexing transmission apparatus and optical output control method for optical wavelength multiplexing transmission apparatus
The present invention provides an optical wavelength multiplexing transmission apparatus and an optical output control method for an optical wavelength multiplexing transmission apparatus in an...
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6819482 |
Optical amplifier and optical communication system including the same
The present invention relates to an optical amplifier (TDFA) having a configuration which enables to reduce temperature dependence of the gain with reduced power consumption and simple control. The...
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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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6819479 |
Optical amplification using launched signal powers selected as a function of a noise figure
In one embodiment, an optical amplifier includes a gain medium operable to receive a plurality of signals each having a center wavelength and a noise figure associated with at least a portion of...
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6813066 |
Gain control in nonlinear fiber amplifier stages
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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6813021 |
Method and apparatus for monitoring optical signal-to-noise ratio (OSNR) using polarization-nulling method
The present invention relates to a method and apparatus for automatically monitoring an optical signal-to-noise ratio in which an arbitrarily polarized optical signal including an unpolarized ASE...
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6810214 |
Method and system for reducing degradation of optical signal to noise ratio
In one aspect of the invention, a system operable to reduce degradation of an optical signal to noise ratio where signals having multiple wavelengths are communicated over a common optical link...
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6809857 |
Optical preamplifier with one amplification unit
An optical preamplifier with an amplification unit is for amplifying an optical signal and compensating dispersion of the optical signal after receiving the optical signal from an optical...
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