| Patent Number |
Title Of Patent |
Date Issued |
| 7400442 |
Optical signal amplifier |
July 15, 2008 |
| 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 include one or more birefringent optical fibers which support two polarization modes, a |
| 7248399 |
Optical fiber for Raman amplification, optical fiber coil, Raman amplifier, and optical communic |
July 24, 2007 |
| 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. Raman gain efficiency with a pumping light of 1,450 nm is equal to or more than 5 (W.times.km).s |
| 7224513 |
Pumping light source having amplification-band extending function for Raman amplification, Raman |
May 29, 2007 |
| A pumping light source unit for Raman amplification includes at least one pumping light source that outputs a first pumping light covering a current amplification band; at least one additional pumping light source that outputs a second pumping light covering an amplification band to be |
| 7206123 |
Raman amplifier, pump source for use in a raman amplifier and method for amplifying an optical s |
April 17, 2007 |
| A method, pump and Raman amplifier control an amount of stimulated Brillouin scattering (SBS) produced by the Raman amplifier pump so as to regulate a power penalty experienced by a receiver due to the SBS. A multi-mode semiconductor laser produces a multi-mode pump light having a do |
| 7199919 |
Tunable multimode wavelength division multiplex Raman pump and amplifier, and a system, method, |
April 3, 2007 |
| A tunable multimode wavelength division multiplex Raman pump and amplifier, and a system, method, and computer program product for controlling a tunable Raman pump and amplifier. The tunability of the pump source is accomplished by controlling the optical output and central wavelengt |
| 7072369 |
Depolarized laser diode module and depolarized laser diode light source |
July 4, 2006 |
| The present invention provides the following designing method: in a laser diode module or a depolarized laser diode module which has one laser diode and one polarization maintaining fiber connected to the output side thereof, the length of the polarization maintaining fiber is a value |
| 7050221 |
Raman amplifier |
May 23, 2006 |
| In a Raman amplifier using three or more pumping wavelengths, when the pumping wavelengths are divided into a short wavelength side group and a long wavelength side group at the boundary of the pumping wavelength having the longest interval between the adjacent wavelengths, the short |
| 6977769 |
Pump light source device for optical Raman amplification and optical Raman amplification system |
December 20, 2005 |
| Disclosed are: a pump light source device for Raman amplification for outputting a pump light for causing signal lightwaves introduced into an optical fiber to undergo Raman amplification therein, the device including two light sources, a polarization beam combiner or a polarization- |
| 6950230 |
Pump light source for Raman amplifier and Raman amplifier using the same |
September 27, 2005 |
| When varying the Raman gain or the gain tilt of an optical amplifier, there is no need to individually adjust the output level of every pump light source or perform overall adjustment, making it possible to obtain a targeted gain with little adjustment. For this purpose, in a pump light |
| 6927896 |
Raman optical amplification system |
August 9, 2005 |
| In a Raman optical amplification system in which WDM optical signals comprising two or more signal bands are transmitted in a transmission line, and in which a plurality of pumping lightwaves are introduced into said transmission line so that WDM optical signals in the shortest signal |
| 6917466 |
Raman amplifier system, apparatus and method for identifying, obtaining and maintaining an arbit |
July 12, 2005 |
| A Raman amplifier, system and method using a plurality of pumps configured to pump light into an optical fiber so as to Raman-amplify an optical signal propagating through the optical fiber. The Raman amplifier also includes an optical coupler configured to optically interconnect the |
| 6882468 |
Raman amplifier |
April 19, 2005 |
| In a Raman amplifier using three or more pumping wavelengths, when the pumping wavelengths are divided into a short wavelength side group and a long wavelength side group at the boundary of the pumping wavelength having the longest interval between the adjacent wavelengths, the short |
| 6882467 |
Raman amplification method and optical signal transmission method using the same |
April 19, 2005 |
| First pump light for Raman-amplifying optical signal is inputted to the output end of the optical signal, and second pump light used for Raman-amplifying the first pump light and having a wavelength shorter than that of the first pump light is inputted to the input end of the optical |
| 6825972 |
Raman amplifier |
November 30, 2004 |
| In a Raman amplifier using three or more pumping wavelengths, when the pumping wavelengths are divided into a short wavelength side group and a long wavelength side group at the boundary of the pumping wavelength having the longest interval between the adjacent wavelengths, the short |
| 6775057 |
Raman amplifier, optical repeater, and raman amplification method |
August 10, 2004 |
| A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent cent |
| 6768577 |
TUNABLE MULTIMODE LASER DIODE MODULE, TUNABLE MULTIMODE WAVELENGTH DIVISION MULTIPLEX RAMAN PUMP |
July 27, 2004 |
| A tunable multimode wavelength division multiplex Raman pump and amplifier, and a system, method, and computer program product for controlling a tunable Raman pump and amplifier. The tunability of the pump source is accomplished by either straining or heating an external fiber grating, |
| 6738180 |
Optical transmission system |
May 18, 2004 |
| An optical transmission system is provided in which a plurality of Raman amplifiers are combined so that the wavelength band of a first Raman amplifier in the form of an upward convex curve including the maximum gain value and the wavelength band of a second Raman amplifier in the form o |
| 6654162 |
Raman amplifier, optical repeater, and Raman amplification method |
November 25, 2003 |
| A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent cent |
| 6646787 |
Raman amplifier, optical repeater, and Raman amplification method |
November 11, 2003 |
| A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent cent |
| 6636344 |
Raman amplifier, optical repeater, and raman amplification method |
October 21, 2003 |
| A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent cent |
| 6633697 |
Raman amplification method and optical signal transmission method using same |
October 14, 2003 |
| First pump light for Raman-amplifying optical signal is inputted to the output end of the optical signal, and second pump light used for Raman-amplifying the first pump light and having a wavelength shorter than that of the first pump light is inputted to the input end of the optical |
| 6611370 |
Raman amplifier system, apparatus and method for identifying, obtaining and maintaining an arbit |
August 26, 2003 |
| A Raman amplifier, system and method using a plurality of pumps configured to pump light into an optical fiber so as to Raman-amplify an optical signal propagating through the optical fiber. The Raman amplifier also includes an optical coupler configured to optically interconnect the |
| 6611369 |
Optical signal amplifier |
August 26, 2003 |
| An optical signal amplifier comprises 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 comprise one or more birefringent optical fibers which support two polarization modes, a |
| 6542666 |
Optical component |
April 1, 2003 |
| Wavelength multiplex transmission is realized in which the temperature dependency of an EDFA is compensated for in relation to the wavelengths which are used. A first and a second long-period grating which have different periods from each other are formed in an optical fiber, ensuring |
| 6501593 |
Raman amplifier, optical repeater, and raman amplification method |
December 31, 2002 |
| A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent cent |
| 6411430 |
Optical amplifier |
June 25, 2002 |
| In an optical amplifier having a plurality of rare earth doped optical fibers in a multi-stage, there are provided one or more optical variable attenuator means, and an attenuation amount control means for changing an optical attenuation amount of the optical variable attenuator means on |
| 6292288 |
Raman amplifier, optical repeater, and raman amplification method |
September 18, 2001 |
| A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent cent |
