Inventor · disambiguated record
Takafumi Terahara
Also filed as: TERAHARA TAKAFUMI
75 granted patents·7 pending applications·1,363 citations·filing 1995–2024
99Inventor score
Files withFUJITSU LTD75SUMITOMO ELECTRIC INDUSTRIES2AKIYAMA YUICHI1FUJITSU NETWORK COMMUNICATIONS1MIURA AKIRA1
Top patents by PatentIndex Score
82 records- 0197US6307656B2Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing deviceFUJITSU LTD·Filed 2001·Granted Oct 23, 2001·72 cites·6 claims
- 0295US11968033B2Optical transmission device, optical transmission system, and optical transmitting power control methodFUJITSU LTD·Filed 2022·Granted Apr 23, 2024·4 cites·9 claims
- 0395US7620321B2Optical transmitting apparatus, method of increasing the number of paths of the apparatus, and optical switch module for increasing the number of paths of the apparatusFUJITSU LTD·Filed 2005·Granted Nov 17, 2009·26 cites·8 claims
- 0493US7099541B2Optical fiber cableFUJITSU LTD·Filed 2005·Granted Aug 29, 2006·14 cites·1 claims
- 0593US6654561B1Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method and optical communication system each utilizing the methodFUJITSU LTD·Filed 2000·Granted Nov 25, 2003·60 cites·36 claims
- 0693US6271945B1Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal lightFUJITSU LTD·Filed 1999·Granted Aug 7, 2001·119 cites·25 claims
- 0792US6885499B1Optical amplifying apparatus for amplifying wide-wavelength-band light, optical sending apparatus, optical transmission system, and optical amplifying methodFUJITSU LTD·Filed 2000·Granted Apr 26, 2005·37 cites·45 claims
- 0892US6512628B1Distributed optical amplifier, amplifying method, and optical communication systemFUJITSU LTD·Filed 2000·Granted Jan 28, 2003·32 cites·8 claims
- 0992US6219176B1Method for gain equalization, and device and system for use in carrying out the methodFUJITSU LTD·Filed 1998·Granted Apr 17, 2001·67 cites·32 claims
- 1091US7792428B2Optical add/drop multiplexerFUJITSU LTD·Filed 2005·Granted Sep 7, 2010·12 cites·13 claims
- 1191US6721481B2Distributed optical fiber amplifier using fiber with specific characteristic valuesFUJITSU LTD·Filed 2001·Granted Apr 13, 2004·25 cites·4 claims
- 1291US6381064B1Method for gain equalization, and device and system for use in carrying out the methodFUJITSU LTD·Filed 2000·Granted Apr 30, 2002·21 cites·3 claims
- 1391US6134034AApparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal lightFUJITSU LTD·Filed 1996·Granted Oct 17, 2000·104 cites·31 claims
- 1489US7853148B2Optical add/drop multiplexerFUJITSU LTD·Filed 2009·Granted Dec 14, 2010·10 cites·19 claims
- 1589US5841557AMethod and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal lightFUJITSU LTD·Filed 1996·Granted Nov 24, 1998·106 cites·42 claims
- 1687US6941074B2Bidirectionally transmittable optical wavelength division multiplexed transmission systemFUJITSU LTD·Filed 2001·Granted Sep 6, 2005·41 cites·8 claims
- 1786US6211980B1Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing deviceFUJITSU LTD·Filed 1998·Granted Apr 3, 2001·61 cites·17 claims
- 1885US8131152B2Optical add/drop multiplexerAKIYAMA YUICHI·Filed 2010·Granted Mar 6, 2012·5 cites·19 claims
- 1985US7603007B2Quadrature phase-shift keying modulator and phase shift amount controlling method for the sameFUJITSU LTD·Filed 2008·Granted Oct 13, 2009·11 cites·10 claims
- 2085US6339492B1Tunable optical filterFUJITSU LTD·Filed 1998·Granted Jan 15, 2002·61 cites·57 claims
- 2184US7933519B2Optical cross-connect using wavelength selective switchesFUJITSU LTD·Filed 2007·Granted Apr 26, 2011·9 cites·4 claims
- 2281US7711270B2Optical node and optical add/drop multiplexerFUJITSU LTD·Filed 2005·Granted May 4, 2010·8 cites·11 claims
- 2379US7860408B2Interferometer for demodulating differential M-phase shift keying signalFUJITSU LTD·Filed 2007·Granted Dec 28, 2010·9 cites·2 claims
- 2478US6580551B2Method for gain equalization, and device and system for use in carrying out the methodFUJITSU LTD·Filed 2001·Granted Jun 17, 2003·8 cites·40 claims
- 2577US7382979B2Wavelength dispersion compensation design method and a system thereofFUJITSU LTD·Filed 2005·Granted Jun 3, 2008·6 cites·11 claims
- 2677US6647211B2Remote 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 filterFUJITSU LTD·Filed 2002·Granted Nov 11, 2003·15 cites·14 claims
- 2777US6493129B2Tunable optical filterFUJITSU LTD·Filed 2001·Granted Dec 10, 2002·13 cites·28 claims
- 2877US6344914B1Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifierFUJITSU LTD·Filed 1997·Granted Feb 5, 2002·38 cites·56 claims
- 2974US8295703B2Optical transmission apparatusMIURA AKIRA·Filed 2009·Granted Oct 23, 2012·5 cites·16 claims
- 3074US6061157AOptical wavelength multiplexing and demultiplexing device and an optical transmission system using the sameFUJITSU LTD·Filed 1997·Granted May 9, 2000·38 cites·23 claims
- 3173US7483639B2Method and system for transmitting information in an optical communication system using distributed amplificationFUJITSU LTD·Filed 2001·Granted Jan 27, 2009·9 cites·20 claims
- 3272US7233742B2Optical communication system, method for supplying pump light, and distributed Raman amplifying apparatusFUJITSU LTD·Filed 2001·Granted Jun 19, 2007·13 cites·27 claims
- 3372US6741389B2Optical transmission system and optical transmission method utilizing Raman amplificationFUJITSU LTD·Filed 2002·Granted May 25, 2004·14 cites·16 claims
- 3472US6535309B1Optical multiplexing/demultiplexing apparatus and optical multiplexing/demultiplexing methodFUJITSU LTD·Filed 1998·Granted Mar 18, 2003·36 cites·8 claims
- 3569US7437074B2Wavelength division multiplexing transmission systemFUJITSU LTD·Filed 2004·Granted Oct 14, 2008·8 cites·6 claims
- 3668US7336870B2Optical transmission systemFUJITSU LTD·Filed 2006·Granted Feb 26, 2008·3 cites·8 claims
- 3767US7936993B2Chromatic dispersion compensating apparatusFUJITSU LTD·Filed 2009·Granted May 3, 2011·2 cites·11 claims
- 3867US7720383B2Optical transmission apparatus having OADM functionFUJITSU LTD·Filed 2007·Granted May 18, 2010·3 cites·5 claims
- 3965US9031418B2Communication system, measuring apparatus, transmitting apparatus, and measurement methodYUKI MASAHIRO·Filed 2011·Granted May 12, 2015·2 cites·17 claims
- 4065US6856453B2Control scheme for long wavelength channels in wideband WDM optical fiber transmission systemFUJITSU LTD·Filed 2003·Granted Feb 15, 2005·7 cites·29 claims
- 4165US6807376B2Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifierFUJITSU LTD·Filed 2001·Granted Oct 19, 2004·7 cites·7 claims
- 4264US6693739B2Method for gain equalization, and device and system for use in carrying out the methodFUJITSU LTD·Filed 2002·Granted Feb 17, 2004·3 cites·40 claims
- 4364US5729372AOptical transmission method and apparatus and optical amplification method and apparatus for optical communication systemFUJITSU LTD·Filed 1996·Granted Mar 17, 1998·27 cites·22 claims
- 4463US8958695B2Optical adding and dropping device and optical transmission apparatusOOI HIROKI·Filed 2008·Granted Feb 17, 2015·2 cites·17 claims
- 4563US7505414B2Network designing device and computer-readable mediumFUJITSU LTD·Filed 2004·Granted Mar 17, 2009·7 cites·14 claims
- 4663US7054060B2Raman amplification system utilizing bi-directional pumpingFUJITSU LTD·Filed 2004·Granted May 30, 2006·6 cites·15 claims
- 4762US7873283B2Method of monitoring optical signal to noise ratio and optical transmission system using the sameFUJITSU LTD·Filed 2003·Granted Jan 18, 2011·6 cites·11 claims
- 4862US6934454B2Distributed optical amplifying apparatus, optical communication station, optical communication system, and optical fiber cableFUJITSU LTD·Filed 2004·Granted Aug 23, 2005·4 cites·40 claims
- 4962US6717730B2Tunable optical filterFUJITSU LTD·Filed 2002·Granted Apr 6, 2004·5 cites·20 claims
- 5062US6366379B1Remote 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 filterFUJITSU LTD·Filed 1998·Granted Apr 2, 2002·25 cites·15 claims
Showing the top 50 of 82 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →