|
Match
|
Document |
Document Title |
|
|
6496301 |
Helical fiber amplifier
A multi-mode gain fiber is provided which affords substantial improvements in the maximum pulse energy, peak power handling capabilities, average output power, and/or pumping efficiency of fiber...
|
|
|
6496300 |
Optical amplifier
An optical amplifier of a wavelength-division multiplexing transmission system that includes a pre-stage optical amplifying unit and a post stage optical amplifying unit. The pre-stage optical...
|
|
|
6493133 |
System and method for increasing capacity of undersea cables
A method of increasing usable bandwidth on a long-haul cable system having at least one optical fiber, the method comprising the steps of: (a) effecting counter-propagating first and second signals...
|
|
|
6490079 |
Device for suppressing transient effect of optical fiber amplifier in WDM system
A device for suppressing the transient effect of an optical fiber amplifier in a WDM system includes an input sensor which converts an input optical signal to an electrical signal; a transient...
|
|
|
6487352 |
Electrical detector for adaptive control of chromatic dispersion in optical systems
An optical device for detecting chromatic dispersion is described. The optical device includes a receiver, which converts an optical signal into an electrical signal having a plurality of frequency...
|
|
|
6487006 |
Simultaneous single mode and multi-mode propagation of signals in a double clad optical fiber
An optical amplifier having a suitable length of Er/Yb co-doped double clad optical fiber is used to amplify an input optical signal. The inner clad of the double clad optical fiber supports the...
|
|
|
6487005 |
Optical fiber transmission system with chromatic dispersion compensation
A long-distance optical transmission system comprising pulse emitter and receiver means ( 1, 2 ) and an optical line ( 3 ) which extends between said emitter and receiver means ( 1, 2 ) and which...
|
|
|
6483637 |
System and method for per-band optical amplification
A method and apparatus for amplifying an optical signal is provided. In accordance with one example embodiment of the invention, the optical amplification system includes an optical signal...
|
|
|
6483636 |
Optical amplifier
An optical amplifier to reduce signal loss by reducing crosstalk, and method therefor. A demultiplexer isolates an optical signal into a first wavelength band and a second wavelength band. The...
|
|
|
6483635 |
Apparatus for light amplification
A system for reducing reflection of an optical system can reduce or eliminate reflection at facets of a semiconductor gain medium and can suppress natural longitudinal modes produced within the...
|
|
|
6483632 |
Multistage optical amplifier with gain flattening
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...
|
|
|
6483631 |
Optical amplifier spectral tilt controllers
Spectral tilt controllers are provided for optical amplifiers and other optical network equipment used in fiber-optic communications links in fiber-optic networks. The tilt controllers may be used...
|
|
|
6483630 |
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
A method of controlling an output of an optical amplifier which amplifies a multiplexed light ray propagated through a transmission path in an optical transmission system and which includes a probe...
|
|
|
6480329 |
Multi-wavelength light amplifier
A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second-stage light amplifier which has a...
|
|
|
6477297 |
Reduction of bend loss through constraint of optical fiber parameters
A method of assembling an optical system includes the steps of: (i) selecting, from a plurality of optical fibers characterized by a common nominal cut-off wavelength λ cn and an actual cut-off...
|
|
|
6476961 |
Optical amplifier systems with transient control
Optical amplifier equipment for operation in fiber-optic communications networks is provided. The optical amplifier equipment may include one or more gain, stages based on rare-earth-doped fiber or...
|
|
|
6473225 |
Light amplifier device
In order to be able to use a semiconductor light amplifier of conventional type and operating under gain saturation conditions while nevertheless providing constant gain for an optical signal to be...
|
|
|
6469826 |
Optical amplifier
In the optical amplifier an optical divider based on long wavelength (or short wavelength) transmission type dielectric multi-layer filter divides input signal light according to wavelengths, and...
|
|
|
6469825 |
Method of amplifying optical signals using erbium-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 yttrium aluminum oxide...
|
|
|
6466712 |
Optical transmission link incorporating highpass optical filtering
An optical fiber transmission link with reduced channel depletion due to stimulated Raman scattering is formed by including a high pass optical filter in the transmission fiber. The filter may...
|
|
|
6466364 |
Gain flattening with nonlinear sagnac amplifiers
An apparatus and a method provide gain flattening in communications systems wherein a large number of optical signals at different wavelengths must be amplified while maintaining signal power...
|
|
|
6466362 |
Hybrid amplifier and control method herefor that minimizes a noise figure for particular span loss
A hybrid amplifier reduces the noise generated by the hybrid amplifier. The hybrid amplifier includes a rare-earth doped fiber amplifier such as an EDFA (erbium-doped fiber amp), a Raman amplifier,...
|
|
|
6466344 |
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
The first present invention provides an optical switch including the following elements. At least a plurality of optical transmission lines are provided for transmission of optical signals. Each of...
|
|
|
6462878 |
Double chirped mirror
The invention is a double chirped mirror and a method of constructing a double chirped mirror for a frequency range of electromagnetic radiation, comprising specifying a design including a...
|
|
|
6462863 |
System and method for resolving polarization mode dispersion in optical fibers
A system and method for resolving polarization mode dispersion (PMD) in a span of optical fiber is described. The method involves three main stages: (1) launch two co-polarized optical signals to...
|
|
|
6462862 |
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...
|
|
|
6462861 |
Optical amplifying apparatus and optical communication system
The present invention aims at providing an optical amplifying apparatus constituted by combining Raman amplifiers, in which deterioration of a signal/noise ratio of output light is prevented to...
|
|
|
6459527 |
Optical amplifier apparatus and control method thereof, and optical transmission system using optical amplifier apparatus
A control method of an optical amplifier apparatus for compensating a gain characteristic of an optical amplifying medium. The control method includes providing an active gain characteristic...
|
|
|
6459526 |
L band amplifier with distributed filtering
An L-band optical amplifier has a rare earth doped gain medium including a filter distributed over a finite physical portion of the gain medium. The filter is distributed over between about 25% to...
|
|
|
6456427 |
Systems and methods for reducing a signal spectrum tilt
Methods and systems for reducing a first tilt of a spectrum of light transmitted via an optical fiber are provided. To reduce the first tilt, an amplifier, such as an erbium doped fiber amplifier,...
|
|
|
6456426 |
Raman amplifiers with modulated pumps
Optical amplifiers are provided in which optical gain is produced by Raman pumping fiber. The Raman-pumped fiber may be a span of transmission fiber or a coil of fiber in a discrete amplifier....
|
|
|
6456425 |
Method and apparatus to perform lumped raman amplification
A method and apparatus to amplify an optical signal is described. A first filter splits an optical signal into a first and second parts. A first raman amplifier amplifies the first part. A second...
|
|
|
6452722 |
Optical amplifier with automatic level control and automatic gain control
Regulated optical amplifiers for wavelength-division multiplex signal transmission that include a first control device for regulating the gain and a second, dominating control device having a...
|
|
|
6452719 |
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...
|
|
|
6452718 |
WDM-channel equalizer
The present invention relates to an arrangement and a method relating to optical channel equalizers. The channel equalizer includes at least one Q-port direction-dependent router ( 40 ), where...
|
|
|
6452717 |
Fiber optic amplifier
The present invention relates to a fiber optic amplifier comprising a structure enabling favorable signal amplification characteristics to be maintained even in an environment exposed to radiation....
|
|
|
6449085 |
Optical direct amplifier and control method thereof
An optical direct amplifier includes an O/E converter for converting a branched output light into an electric signal, a frequency variable filter for detecting a modulated frequency specific to a...
|
|
|
6449070 |
Optical transmission device and wavelength-multiplexed optical transmission system
An optical transmission device that can be applied to a wavelength-multiplexed optical transmission system includes a first part creating a supervisory control signal to be transmitted in optical...
|
|
|
6445493 |
Balanced gain flattening filters
Compound gain flattening filters of optical amplification include a series of filter components with spectral responses that are combined to approach a target loss spectrum. Small variations in the...
|
|
|
6441955 |
Light wavelength-multiplexing systems
A wavelength-division multiplexing optical communication system for wavelength-division multiplexing a plurality of optical signals having different wavelengths and transmitting a...
|
|
|
6441953 |
L band multistage amplifier with improved noise figure
A multi-stage optical fiber amplifier comprises a first gain stage amplifying and optical signal; a pumping source coupled to the first gain stage, a second gain stage coupled to the first gain to...
|
|
|
6441952 |
Apparatus and method for channel monitoring in a hybrid distributed Raman/EDFA optical amplifier
The present invention provides a hybrid Raman/EDFA optical amplifier that utilizes a first optical detector that generates a first electrical or electronic signal that is proportional the combined...
|
|
|
6437908 |
Optical amplifying device
An optical brancher 110 branches an input optical signal into two. An optical detector 120 converts one optical signal branched by t e optical brancher 110 into an electrical signal. A first...
|
|
|
6437906 |
All-optical gain controlled L-band EDFA structure with reduced four-wave mixing cross-talk
An approach for minimizing four-wave mixing (FWM) cross-talk (XT) in a WDM (wavelength division multiplexing) optical communication system is disclosed. An Erbium doped Fiber Amplifier (EDFA)...
|
|
|
6433925 |
Optical fiber amplifier and optical transmission system using the same
A variable attenuator is inserted into an optical input part and a feedback control is performed so that an optical input to an amplifying optical fiber becomes constant. Further, a control for...
|
|
|
6433924 |
Wavelength-selective optical amplifier
A wavelength-selective filter, such as a narrow bandpass filter, is used to filter both the input and output of an optical amplifier. The selected channel is amplified and can be re-combined with...
|
|
|
6433923 |
Optical transmission path having sections which overcompensate for dispersion occurring in the sections
An optical communication system which includes a transmission path through which a light is transmitted to a specific point, such as to a receiver. The transmission path includes a plurality of...
|
|
|
6433922 |
Apparatus and method for a self adjusting Raman amplifier
This invention describes an apparatus and method for a self adjusting Raman amplifier for fiber optic transmission lines incorporating a line diagnostic mechanism in order to calculate, control and...
|
|
|
6433920 |
Raman-based utility optical amplifier
An optical amplifier with a flattened wideband response is obtained by coupling counter-propagating pumping energy into an optical waveguide to cause Raman amplification in the optical waveguide,...
|
|
|
6429964 |
High power, multiple-tap co-doped optical amplifier
A high power optical amplifier with a multiple-tap output includes a preamplifier stage (such as an EDFA), followed by a power amplifier comprises a concatenated set of co-doped optical amplifier...
|