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7446934 Raman, pump power control for gain flattening  
The present invention aims at providing a method for controlling wavelength characteristics of optical transmission powers by Raman amplification, in which the wavelength characteristics of optical...
7446932 Method, apparatus and system for 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),...
7444078 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...
7443575 Discrete hybrid SOA-Raman amplifier with broad gain bandwidth  
A discrete hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses one or more Raman laser pumps together with semiconductor optical amplifiers in series to produce a...
7440177 Method and system for improved eye protection safety of high output power lumped optical amplifiers  
A system and method for providing eye-safety protection during operation of a lumped optical amplifier. The method is based on monitoring of continuous out-of-band Raman amplified spontaneous...
7440167 Optical fiber for Raman amplification, optical fiber coil, Raman amplifier, and optical communication system  
An optical fiber for Raman amplification amplifies a signal light with a pumping light. A chromatic dispersion at a wavelength of 1,550 nm is in a range between −70 ps/nm/km and −30 ps/nm/km....
7440166 Raman diffusion optical amplifier  
An amplifier or laser using the stimulated Raman diffusion effect comprises a light guide ( 6 ), and a light pump ( 10 ) for producing a pump wave. In order to increase amplification efficiency,...
7440165 Optical fiber  
Provided is an optical fiber. The optical fiber includes a core and a cladding, the core containing a first element for inducing non-linear Raman phenomenon, and the cladding containing a second...
7440164 Apparatus and method for Raman gain spectral control  
The invention pertains to optical fiber transmission systems, and is particularly relevant to optical transport systems employing Raman optical amplifiers. In particular the invention teaches an...
7436582 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...
7436581 Apparatus and method for self-phase control with stimulated Brillouin scattering phase conjugate mirror  
A method for controlling phases of beams to make relative phases of the beams “0 ” in a beam splitting amplification laser using a stimulated Brillouin scattering phase conjugate mirror. A...
7433116 Infra-red light source including a raman shifter  
An infrared light source includes one or more combiners that are coupled to at least a first pump laser and a second pump laser. The combiners are operable to couple a first optical signal...
7411728 Devices and methods 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...
7411727 Method and an optical amplifier assembly for adjusting Raman gain  
A method of adjusting Raman gain in an optical amplifier assembly ( 1 a ). The method comprises inputting a plurality (N) of optical signals (OS) on different wavelength channels to a...
7408146 Signal light transmitting apparatus, signal light transmitting system using the same, and signal light transmitting method  
A signal light transmitting apparatus from which signal light is led into a transmission optical fiber, the transmission optical fiber transmitting the led signal light, includes: a signal light...
7400442 Optical signal amplifier  
An optical signal amplifier includes a light source, a depolarizer, and a gain medium that transfers energy from a pump beam output from the depolarizer to the optical signal. The depolarizer may...
7400441 Optical amplifier, optical amplification repeater and pump light supply control method  
There is provided an optical amplifier including a Raman amplification medium, a rare earth doped fiber located at a latter stage of the Raman amplification medium, a first pump light outputting...
7397599 Doped-ring amplifying optical fiber, and an amplifier containing such a fiber  
The amplifying optical fiber comprises a single-mode core and a multimode core surrounding the single-mode core, the multimode core containing a doped layer referred to as a “doped ring” and...
7394589 Optical amplifier for wide band Raman amplification of wavelength division multiplexed (WDM) signal lights  
A Raman amplifier providing a wideband gain for use in a wavelength division multiplexing (WDM) optical communication system. In one embodiment, a first optical amplifier Raman amplifies a...
7391560 Multistage optical amplifier having tilt compensation feature  
The present invention relates to an optical amplifier and, in particular, it relates to multistage optical amplification having a feature for compensating for the tilt that is generated when a...
7391559 Apparatus and method for Raman gain spectral control  
The invention pertains to optical fiber transmission systems, and is particularly relevant to optical transport systems employing Raman optical amplifiers. In particular the invention teaches an...
7385753 Hybrid optical amplifier using gain-clamped semiconductor optical amplifier enabling raman amplification  
Provided is a hybrid optical amplifier using a gain-clamped semiconductor optical amplifier enabling Raman amplification. The hybrid optical amplifier comprises a spool of optical fiber used as...
7379233 Raman amplifier utilizing pump modulation for expanding gain band width  
A plurality of pump light sources generate plural variations of pump light having different frequencies. A modulation circuit intensity-modulates the plural variations of pump light in the...
7372622 Optical transmission system, optical repeater, and optical transmission method  
In a WDM transmission system employing a plurality of short wavelength bands having great attenuation due to optical fiber transmission, an optical repeater is constructed of a first multiplexing...
7372056 LPP EUV plasma source material target delivery system  
An EUV light generation system and method is disclosed that may comprise a droplet generator producing plasma source material target droplets traveling toward the vicinity of a plasma source...
7365902 Optical amplifier and optical communication system  
An optical amplifier includes a plurality of pump light sources, an intensity modulator that modulates intensity of a pump light to be output from any one of the pump light sources, at a...
7362499 Optical amplifier with pump light source control for Raman amplification  
A Raman amplifier for amplifying a wavelength division multiplexed (WDM) light including signal lights wavelength division multiplexed together. The amplifier includes an optical amplifying medium...
7355786 Raman amplifying device and raman amplifying system  
A Raman amplifying device includes a plurality of Raman amplifiers having a gain wavelength characteristic with a gain peak at which an amplification gain becomes the largest, including a first...
7346280 Bi-directional long haul/ultra long haul optical communication link  
A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite...
7342714 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...
7342711 Method and contrivance for applying a Raman amplification in a transmission and/or fibre device  
Raman amplification is used in optical transmission systems, devices and/or components way of for applying Raman amplification avoiding or suppressing detrimental and hence undesirable non-linear...
7340164 Optical WDM transmission system  
An optical wavelength division multiplex transmission system ( 1 ) for transmitting optical signals (S) on a plurality of wavelength channels has a transmitting terminal ( 2 ) and a receiving...
7330302 Optical transmission system  
This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system,...
7321461 Broadband light source suitable for pump module for Raman amplification and Raman amplifier using same  
Provided are a broadband light source suitable for a pump light module for Raman amplification and a Raman amplifier which uses such light source. The broadband light source comprises a light...
7312918 Optical transmission system having function of correcting noise light due to Raman amplification  
An optical transmission system wherein a main signal light is amplified by Raman amplification, and noise light (ASS light) produced by the Raman amplification can be corrected with a simple...
7307782 Raman amplifier and optical communication system including the same  
The present invention relates to a Raman amplifier where flexibility in device design considering both of Raman amplification and dispersion compensation is high. In the Raman amplifier, the Raman...
7295739 Coherent DUV illumination for semiconductor wafer inspection  
An apparatus for inspecting a specimen, such as a semiconductor wafer, is provided. The apparatus comprises a laser energy source, such as a deep ultraviolet (DUV) energy source and an optical...
7291805 Target isolation system, high power laser and laser peening method and system using same  
A system for applying a laser beam to work pieces, includes a laser system producing a high power output beam. Target delivery optics are arranged to deliver the output beam to a target work piece....
7283292 Method and system for improved eye protection safety of distributed raman amplifiers  
A system and method for providing eye-safety protection during operation of distributed Raman amplifiers based on the application of continuous out-of-band amplified spontaneous scattering (ASS)...
7280271 Fast dynamic gain control in cascaded Raman fiber amplifiers  
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...
7280270 Fast dynamic gain control in cascaded Raman fiber amplifiers  
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...
7280269 Fast dynamic gain control in cascaded Raman fiber amplifiers  
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...
7277221 Fast dynamic gain control in cascaded Raman fiber amplifiers  
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...
7274503 Distributed raman amplification  
A communication system for distributed Raman amplification of optical signals is disclosed. The communication system comprises a first fiber span, a second fiber span, and an amplifier system. The...
7271948 Method and apparatus for reducing crosstalk and nonlinear distortions induced by raman interactions in a wavelength division mulitplexed (WDM) optical communication system  
A method and apparatus is provided for transmitting a WDM optical signal. The method begins by modulating a plurality of optical channels that are each located at a different wavelength from one...
7266258 Two-photon absorption generated carrier lifetime reduction in semiconductor waveguide for semiconductor based raman laser and amplifier  
A semiconductor based Raman laser and/or amplifier with reduced two-photon absorption generated carrier lifetimes. An apparatus according to embodiments of the present invention includes optical...
7262903 Method and apparatus for controlling multiple-wavelength-pumped raman amplifier and computer product  
A multiple-wavelength-pumped Raman amplifier includes a control unit that controls, based on a relational expression associating an amount of fluctuation in a current signal light power at a signal...
7262902 High gain resonant modulator system and method  
An optical resonant modulator includes an optical ring resonator and an optical loop that is coupled to the optical ring resonator by two couplers. The optical ring resonator can have a hybrid...
7259906 System and method for voice control of medical devices  
A light source includes a wavelength shifter that is capable of shifting a shorter optical signal wavelength to a longer optical signal wavelength based at least in part on a Raman effect in a...
7259905 Semiconductor laser module, optical amplifier, and method of manufacturing the semiconductor laser module  
A semiconductor laser module has a semiconductor laser device; a package for housing the semiconductor laser device; a PBC fixed in the package for polarization-synthesizing two laser beams output...