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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...
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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),...
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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...
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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...
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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...
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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....
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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....
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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)...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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