|
Match
|
Document |
Document Title |
|
|
8139285 |
Raman amplifying device and control method
A light amplifying device including a Raman amplifier to Raman-amplify a signal light by inputting excitation lights of a plurality of wavelengths to a transmission path through which the signal...
|
|
|
8134775 |
Raman amplifier with signal modulated before stimulated brillouin scattering occurs
An optical amplifier includes a light source that outputs light having an intensity corresponding to a supplied driving power; a modulator that modulates the light output from the light source in...
|
|
|
8111454 |
Optical communication using shared optical pumps
Cross-distribution of the output pump power from optical pump units amongst multiple amplifier gain stages even in a single direction of an optical link in an optical communications system. For...
|
|
|
8111453 |
Submarine optical repeater
A submarine optical repeater that shares optical pump power in multiple gain stages such that approximately the same wavelengths of optical pump is provided to each of the gain stages. Also, tilt...
|
|
|
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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***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...
|
|
|
8103175 |
Optical signal processing systems and methods for amplification and/or attenuation
An optical signal processing system is provided that includes a first light modulator for receiving, placing information on a first optical signal, and for producing a second optical signal. The...
|
|
|
8094986 |
Double clad fiber and fiber end processing method, and fiber-combiner connecting structure including the same
A double clad fiber includes a core, a first cladding provided so as to cover the core, and a second cladding provided so as to cover the first cladding. The second cladding has a plurality of...
|
|
|
8081948 |
Analog signal processor in a multi-gigabit receiver system
An analog multi-gigabit receiver and/or transceiver can be implemented for the reception and demodulation of multi-gigabits quadrature phase shift keying (QPSK) modulated using a CMOS...
|
|
|
8077382 |
Gain-clamped optical amplifying apparatus using fiber Raman amplifier having Raman cavity
Provided is a gain-clamped (GC) optical amplifier using a fiber Raman amplifier (FRA) having a Raman cavity. The FRA having a Raman cavity comprises a Raman fiber module (RFM) amplifying and...
|
|
|
8077384 |
Optical amplifier, and optical transmission system including the optical amplifier
An optical amplifier provided in a repeater station of an optical transmission system is proposed. The optical amplifier amplifies an signal light and performs ALC of output power by means of a...
|
|
|
8068275 |
Method for measuring nonlinear optical properties
In an optical amplifier, an input light is supplied to one end of an optical fiber connected to an output port, and the power of a light in an opposite direction which is input to the output port...
|
|
|
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...
|
|
|
8054538 |
Raman amplification apparatus and distributed raman amplification system as well as starting up method for distributed raman amplification system
A Raman amplification apparatus includes a pumping light supplying section, a main signal wavelength light level acquisition section, a monitoring signal wavelength light level acquisition section,...
|
|
|
8049955 |
Optical amplification apparatus, optical communication apparatus, and optical communication method
A Raman amplifier inputs pump light into an optical fiber (transmission path) through which an optical signal passes, to amplify the optical signal. An optical receiving unit is provided downstream...
|
|
|
8045258 |
Method for regulating OSNR in a fiber optic communication line using Raman amplification
A method for selecting a relation between a gain Gf of a Forward Raman Amplifier (FRA) at a transmitting end of a fiber optic transmission line and an optical signal to noise ratio (OSNR) at a...
|
|
|
8041219 |
Optical network element with Brillouin effect colorless wavelength shift
A method of optical communication includes generating an amplified optical signal from at least a portion of a first optical signal having a first carrier wavelength, λ1. The amplified optical ...
|
|
|
8035890 |
Phase stabilization device for stimulated brillouin scattering phase conjugate mirrors and light amplification apparatus using the same
The object of this invention is to provide a phase stabilization device for stimulated brillouin scattering-phase conjugate mirrors and a light amplification apparatus using the phase stabilization...
|
|
|
8031395 |
Optical transmission system using Raman amplifier and controlling method thereof
The optical transmission system modulates backward Raman pump light provided to an optical transmission line on one link side of an uplink and downlink, to thereby transmit a pilot signal for...
|
|
|
8027082 |
Raman amplifier and excitation light source used thereof
A Raman amplifier provided with a pump source outputting a pumping light; a rare-earth doped fiber inputting the pumping light and outputting an excitation light; and a guiding unit guiding the...
|
|
|
8018647 |
Imaging systems and methods
Imaging systems and methods are provided. In one embodiment, an image system is disclosed that comprises a Raman gain medium configured to receive an image from a target area and a tunable laser...
|
|
|
8004751 |
Wavelength division multiplexing optical transmission system utilizing distributed raman amplification
The WDM optical transmission system using distributed Raman amplification, before starting operation of main signal light, transfers a plurality of lights having different wavelengths to that of...
|
|
|
7995921 |
Banded semiconductor optical amplifiers and waveblockers
Embodiments of the present invention provide an array of semiconductor optical amplifiers, within a photonic integrated circuit (hereinafter, “PIC”), that apply a gain to one or more optical ban...
|
|
|
7995269 |
Cost effective optical transmission with fast raman tilt transient control
A method for cost-effective optical transmission with fast Raman tilt or other transient event control uses a combination of Erbium-doped fiber amplifiers (EDFAs) and Raman fiber amplifiers (RFAs),...
|
|
|
7986453 |
Raman amplifier for amplifying signal light for optical communication, optical communication system equipped with Raman amplifier, and method for controlling Raman amplifier
A Raman amplifier that amplifies a signal light intensity by using a Raman amplification effect of an optical fiber transmission channel has an excitation unit that supplies excitation lights of a...
|
|
|
7982947 |
Regenerative laser amplifier
A laser amplifier system is presented including a pump regenerative amplifier. The amplifier generally has a cavity defined by a pair of end cavity mirrors between which an amplified pump pulse...
|
|
|
7974002 |
System and method for managing system margin
An optical communication system is operable to communicate a plurality of wavelength signals at a bit rate of at least 9.5 gigabits per second over a multiple span communication link spanning at...
|
|
|
7969647 |
Apparatus and method for flattening gain profile of an optical amplifier
A change in loading conditions of fiber amplifiers in an optical communications network causes rapid variations in the gain profile of the amplifiers due to spectral hole burning and stimulated...
|
|
|
7961996 |
Coupling device for use in optical waveguides
An optical waveguide device comprises a plurality of mirrors, wherein at least one mirror comprises a first and second reflective end that reflect and transmit light. The plurality of mirrors...
|
|
|
7957056 |
Zonal lenslet array
The invention includes a master lens, which initially focuses a laser pulse, and then the pulse passes through a zonal lenslet array, which uses different lenslet elements that provide for...
|
|
|
7940454 |
Optical parametric amplifier
In an optical parametric amplifier of the invention, pumping light which is amplified using a practical optical amplifier such as an EDFA is supplied together with signal light having a wavelength...
|
|
|
7933063 |
Monitoring method and apparatus of noise light due to Raman amplification and optical communication system using the same
A monitoring apparatus, based on an optical power monitored in photodetectors arranged at input and output ends of a transmission line, in a condition where pump light is supplied to the...
|
|
|
7924497 |
System and method for gain equalization and optical communication system incorporating the same
An optical amplifier including gain equalization and system incorporating the same. The amplifier includes a Raman portion and an EDFA portion with a gain flattening filter coupled between the...
|
|
|
7924498 |
System and method for optical communication using polarization filtering
An optical circuit is described which may include an SOA-MZI circuit providing an output signal; and a polarization filtering device (PFD) configured to receive the output signal of the SOA-MZI and...
|
|
|
7924496 |
Apparatus and method for Raman gain control
Systems and methods for controlling a Raman amplifier by measuring power at one end of an optical fiber span. The Raman amplifier may include a laser that pumps an optical signal into the optical...
|
|
|
7920795 |
Method and apparatus for transmitting multiple channels in a wavelength division multiplexed (WDM) optical communication system with reduced raman crosstalk and nonlinear distortions
A method and apparatus is provided for transmitting a WDM optical signal. The method begins by modulating an odd number of optical channels that are each located at a different wavelength from one...
|
|
|
7916384 |
Feedback dynamic gain control for a WDM system employing multi wavelength pumped Raman fiber amplifiers
An improved feedback-based dynamic gain control technique for a WDM system employing multi-wavelength-pumped Raman fiber amplifiers (RFAs) is proposed, in which only one feedback or feed-forward...
|
|
|
7916386 |
High power optical apparatus employing large-mode-area, multimode, gain-producing optical fibers
Optical apparatus includes a multimode, gain-producing fiber for providing gain to signal light propagating in the core of the fiber, and a pump source for providing pump light that is absorbed in...
|
|
|
7899650 |
Apparatus and method for detecting and identifying raman signatures
In one aspect, a signal processing system includes a processor, an I/O device operatively associated with the processor, and a memory device bearing instructions configured to cause the processor...
|
|
|
7898732 |
Fast dynamic gain control in a bidirectionally-pumped Raman fiber amplifier
The present invention provides methods and apparatuses for controlling a gain of a bidirectionally-pumped Raman fiber amplifier having both forward optical pumps and backward optical pumps. The...
|
|
|
7894127 |
Optical transmission system and optical amplification method used in the system
At an optical transmission system that uses plural light sources for Raman amplification, even when a failure occurred in a pumping light source in one of the light sources for Raman amplification,...
|
|
|
7869673 |
Remote larger effective area optical fiber
Embodiments described herein relate to an optical fiber stretch that may experience forward Raman amplification in which the peak optical signal power occurs at some distance from the transmitter....
|
|
|
7848013 |
Optical fiber amplification system
An optical fiber amplifier pumping technique based on multiple stimulated Raman scattering (SRS) for optical communication systems includes a plurality of pump signals with increasing wavelength...
|
|
|
7835067 |
Raman amplifier
When pump light is supplied to a transmission line fiber from a downstream station toward an upstream station and signal light from the upstream station is Raman-amplified, a corresponding...
|
|
|
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...
|
|
|
7822314 |
Segmented acoustic core photonic crystal fiber laser
Stimulated Brillouin scattering (SBS) in a photonic crystal fiber is suppressed by doping the individual core segments such that the Brillouin frequency of each segment is sufficiently different...
|
|
|
7813603 |
Optical coupler devices, methods of their production and use
An optical component including an acceptance fiber, e.g. a photonic crystal fiber, for propagation of pump and signal light, a number of pump delivery fibers and a reflector element that reflects...
|
|
|
7813650 |
Optical system
A system and method for controlling the gain of an optical amplifier receiving one or more optical input signal channels at a first end include a source for generating a gain control signal, which...
|
|
|
7813034 |
Multi-stage Raman amplifier
A Raman amplifier comprises at least a first and a second optical Raman-active fiber disposed in series with each other. A first pump source is connected to the first Raman-active fiber, and is...
|
|
|
7804863 |
Laser system
The invention concerns a laser system with a frequency comb generator for generating a comb of optical frequencies having an offset frequency and a plurality of equidistant modes. The laser system...
|
|
|
7796325 |
Distributed Raman amplifier and WDM optical transmission system
In a distributed Raman amplifier according to the present invention, a WDM signal light and a reference light are supplied to one end of an optical transmission path to which a pumping light is...
|