Inventor
TERAHARA TAKAFUMI
JP75 patents
⚠️ This page may combine multiple inventors who share the name “TERAHARA TAKAFUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
49 patentsUS6271945B1Aug 7, 2001
Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light
FUJITSU LTD119 citations98
US6134034AOct 17, 2000
Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light
FUJITSU LTD104 citations98
US5841557ANov 24, 1998
Method and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal light
FUJITSU LTD106 citations98
US6654561B1Nov 25, 2003
Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method and optical communication system each utilizing the method
FUJITSU LTD60 citations96
US6339492B1Jan 15, 2002
Tunable optical filter
FUJITSU LTD61 citations96
US6307656B2Oct 23, 2001
Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing device
FUJITSU LTD72 citations96
US6219176B1Apr 17, 2001
Method for gain equalization, and device and system for use in carrying out the method
FUJITSU LTD67 citations96
US6211980B1Apr 3, 2001
Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing device
FUJITSU LTD61 citations96
US7620321B2Nov 17, 2009
Optical transmitting apparatus, method of increasing the number of paths of the apparatus, and optical switch module for increasing the number of paths of the apparatus
FUJITSU LTD26 citations93
US6885499B1Apr 26, 2005
Optical amplifying apparatus for amplifying wide-wavelength-band light, optical sending apparatus, optical transmission system, and optical amplifying method
FUJITSU LTD37 citations93
US6535309B1Mar 18, 2003
Optical multiplexing/demultiplexing apparatus and optical multiplexing/demultiplexing method
FUJITSU LTD36 citations93
US6512628B1Jan 28, 2003
Distributed optical amplifier, amplifying method, and optical communication system
FUJITSU LTD32 citations93
US6381064B1Apr 30, 2002
Method for gain equalization, and device and system for use in carrying out the method
FUJITSU LTD21 citations93
US6366379B1Apr 2, 2002
Remote control device of acousto-optic tunable filter and optical transmission system containing equalizer using acousto-optic tunable filter and optical transmission system containing optical add/drop multiplexer using acousto-optic tunable filter
FUJITSU LTD25 citations93
US6097535AAug 1, 2000
Method for optical amplification and system for carrying out the method
FUJITSU LTD20 citations93
US6061157AMay 9, 2000
Optical wavelength multiplexing and demultiplexing device and an optical transmission system using the same
FUJITSU LTD38 citations93
US5841571ANov 24, 1998
Optical receiver having a function for suppressing useless intensity modulation components
FUJITSU LTD23 citations93
US7099541B2Aug 29, 2006
Optical fiber cable
FUJITSU LTD14 citations92
US6941074B2Sep 6, 2005
Bidirectionally transmittable optical wavelength division multiplexed transmission system
FUJITSU LTD41 citations92
US6721481B2Apr 13, 2004
Distributed optical fiber amplifier using fiber with specific characteristic values
FUJITSU LTD25 citations92
US6344914B1Feb 5, 2002
Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier
FUJITSU LTD38 citations92
US5729372AMar 17, 1998
Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system
FUJITSU LTD27 citations92
US5539566AJul 23, 1996
Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system
FUJITSU LTD20 citations92
US6452701B1Sep 17, 2002
Wavelength division multiplexing communications network supervisory system
FUJITSU LTD20 citations91
US7933519B2Apr 26, 2011
Optical cross-connect using wavelength selective switches
FUJITSU LTD9 citations84
US7853148B2Dec 14, 2010
Optical add/drop multiplexer
FUJITSU LTD10 citations84
US7792428B2Sep 7, 2010
Optical add/drop multiplexer
FUJITSU LTD12 citations84
US7711270B2May 4, 2010
Optical node and optical add/drop multiplexer
FUJITSU LTD8 citations84
US7603007B2Oct 13, 2009
Quadrature phase-shift keying modulator and phase shift amount controlling method for the same
FUJITSU LTD11 citations84
US7483639B2Jan 27, 2009
Method and system for transmitting information in an optical communication system using distributed amplification
FUJITSU LTD9 citations84
US7233742B2Jun 19, 2007
Optical communication system, method for supplying pump light, and distributed Raman amplifying apparatus
FUJITSU LTD13 citations84
US6647211B2Nov 11, 2003
Remote control device of acousto-optic tunable filter and optical transmission system containing equalizer using acousto-optic tunable filter and optical transmission system containing optical add/drop multiplexer using acousto-optic tunable filter
FUJITSU LTD15 citations84
US7860408B2Dec 28, 2010
Interferometer for demodulating differential M-phase shift keying signal
FUJITSU LTD9 citations83
US6741389B2May 25, 2004
Optical transmission system and optical transmission method utilizing Raman amplification
FUJITSU LTD14 citations82
US6493129B2Dec 10, 2002
Tunable optical filter
FUJITSU LTD13 citations82
US11968033B2Apr 23, 2024
Optical transmission device, optical transmission system, and optical transmitting power control method
FUJITSU LTD4 citations74
US7505414B2Mar 17, 2009
Network designing device and computer-readable medium
FUJITSU LTD7 citations74
US7437074B2Oct 14, 2008
Wavelength division multiplexing transmission system
FUJITSU LTD8 citations74
US7030973B2Apr 18, 2006
Polarization mode dispersion compensator based on degree of polarization
FUJITSU LTD7 citations74
US6717730B2Apr 6, 2004
Tunable optical filter
FUJITSU LTD5 citations74
US6580551B2Jun 17, 2003
Method for gain equalization, and device and system for use in carrying out the method
FUJITSU LTD8 citations74
US6222655B1Apr 24, 2001
Wavelength division multiplex optical amplification transmission system and optical amplifier
FUJITSU LTD8 citations74
US6052221AApr 18, 2000
Optical receiver having a function for suppressing useless intensity modulation components
FUJITSU LTD5 citations74
US6934454B2Aug 23, 2005
Distributed optical amplifying apparatus, optical communication station, optical communication system, and optical fiber cable
FUJITSU LTD4 citations73
US6856453B2Feb 15, 2005
Control scheme for long wavelength channels in wideband WDM optical fiber transmission system
FUJITSU LTD7 citations73
US6807376B2Oct 19, 2004
Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier
FUJITSU LTD7 citations73
US6061172AMay 9, 2000
Active optical fiber and optical fiber amplifier
FUJITSU LTD11 citations73
US7873283B2Jan 18, 2011
Method of monitoring optical signal to noise ratio and optical transmission system using the same
FUJITSU LTD6 citations63
US7796887B2Sep 14, 2010
Wavelength division multiplexing optical transmission system, and wavelength division multiplexing optical transmission method
FUJITSU LTD4 citations63
AKIYAMA YUICHI
1 patentShowing the top 50 of 75 patents by PatentIndex Score.