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| Number | Title | Issue Date |
| 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 light propagates, a plurality of measuring units measuring powers of li... | 03/20/2012 |
| 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 response to an input modulation signal; a Raman amplifier that perform... | 03/13/2012 |
| 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 control mechanism may adjust gain dependency on wavelength by adjustin... | 02/07/2012 |
| 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 outputting an input optical signal and a resonant cavity generating a Raman... | 12/13/2011 |
| 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 from the one end of the optical fiber, is measured, thereby obtaining ... | 11/29/2011 |
| 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, a function information storage section for storing, as function info... | 11/08/2011 |
| 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 of the Raman amplifier and monitors the power of the optical signal ... | 11/01/2011 |
| 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 receiving end of the fiber optic transmission line satisfying limitations... | 10/25/2011 |
| 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 device. A light amplification apparatus of the present invention inc... | 10/11/2011 |
| 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 confirming a connection state of the optical transmission line to a node o... | 10/04/2011 |
| 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 excitation light to an optical fiber to a direction opposite to which a ... | 09/27/2011 |
| 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 configured to pump light into the Raman gain medium over a plurality of... | 09/13/2011 |
| 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 the main signal light (for example Raman amplification pump lights or t... | 08/23/2011 |
| 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), where EDFAs are used as the primary optical amplifiers to compensate... | 08/09/2011 |
| 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 plurality of wavelengths to the optical fiber transmission channel an... | 07/26/2011 |
| 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 least 400 kilometers without optical regenerators. The plurality of wav... | 07/05/2011 |
| 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 Raman scattering. An apparatus for reducing such gain profile variations... | 06/28/2011 |
| 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 predetermined focal lengths so as to establish a three or two dimensional, pr... | 06/07/2011 |
| 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 transmission line at a time of initial startup of an optical communication syst... | 04/26/2011 |
| 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 to provide at least one signal at the output of the PFD. ... | 04/12/2011 |
| 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 Raman portion and the EDFA. ... | 04/12/2011 |
| 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 fiber span. The Raman amplifier may be connected to a controller that ... | 04/12/2011 |
| 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 signal is required for the control of multiple Raman pumps. Compared to... | 03/29/2011 |
| 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 overall gain is controlled by adjusting the forward optical pumps, while... | 03/01/2011 |
| 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, the signal light output level and its wavelength characteristic are ... | 02/22/2011 |
| 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 which are injected into a fiber. The wavelengths of such pump signals a... | 12/07/2010 |
| 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 intensity of amplified spontaneous scattering light is calculated from a requ... | 11/16/2010 |
| 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 adapted for emitting and coupling into the first Raman-active fiber a fi... | 10/12/2010 |
| 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 supplied; the WDM signal light and the reference light, which are propag... | 09/14/2010 |
| 7768698 | Raman amplifier and optical communication system A Raman amplifier includes a pumping light source, an optical coupler, and a Raman amplifier medium. The pumping light source outputs a pumping light that is intensity-modulated with a frequency equal to or higher than 100 megahertz. The optical coupler couples the ... | 08/03/2010 |
| 7760422 | Semiconductor raman ring amplifier A semiconductor-based Raman ring amplifier is disclosed. A method according to aspects of the present invention includes directing a pump optical beam having a pump wavelength and an input pump power level from an optical waveguide into a ring resonator. The optical... | 07/20/2010 |
| 7746547 | Multi-band hybrid SOA-Raman amplifier for CWDM A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multi... | 06/29/2010 |
| 7742223 | System and method for implementing a boosterless optical communication system An optical communication system includes a transmission fiber that is operable to receive at least one optical signal and at least one pump signal. The optical signal includes one or more optical signal wavelengths and a power level at approximately a minimum thresh... | 06/22/2010 |
| 7738163 | Optical transmission system In an optical transmission system for transmission of data along an optical fiber link, a receiver for an optical supervisory channel is capable of detecting data at a lower rate at which a Raman pump is enabled, and at a higher rate which is commenced when the high... | 06/15/2010 |
| 7738164 | Multi-band hybrid SOA-Raman amplifier for CWDM A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multi... | 06/15/2010 |
| 7715092 | Dynamic raman tilt compensation Raman tilt is induced by the propagation of optical signals in optical communication fibers during and after transient events. Certain characteristics of the light are monitored at each amplification node and Raman tilt correction is achieved by spectral tilt contro... | 05/11/2010 |
| 7697197 | Devices and method for Raman amplification and dispersion compensation The present invention provides devices and methods for Raman amplification and dispersion compensation. According to one embodiment of the present invention, a dispersion compensating device includes a dispersion compensating fiber having a dispersion more negative ... | 04/13/2010 |
| 7692849 | Method for measuring nonlinear optical properties, and optical amplifier and optical transmission system using same In an optical amplifier of the present invention, 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 from the one end of the optical fiber, is mea... | 04/06/2010 |
| 7692850 | Lumped-Raman amplification structure for very wideband applications Improved lumped Raman amplification systems are disclosed. A lumped Raman amplification structure provides optimized efficiency, low noise figure over a range of gain settings, and a high saturation threshold. Responsibility for amplifying different portions of the ... | 04/06/2010 |
| 7684112 | Backward stimulated Rayleigh-Bragg scattering devices based on multi-photon absorbing materials and their applications The present invention relates to a method and system of generating backward stimulated Rayleigh-Bragg scattering by focusing activating radiation through a multi-photon absorbing dye solution, thereby producing coherent output radiation with no measured frequency sh... | 03/23/2010 |
