Inventor · disambiguated record
Hiroshi Onaka
Also filed as: ONAKA HIROSHI
84 granted patents·4 pending applications·2,336 citations·filing 1986–2011
99Inventor score
Files withFUJITSU LTD82TAKEDA CHEMICAL INDUSTRIES LTD3FUJITSU NETWORK COMMUNICATIONS1MIYATA HIDEYUKI1OOI HIROKI1
Top patents by PatentIndex Score
88 records- 0197US5894362AOptical communication system which determines the spectrum of a wavelength division multiplexed signal and performs various processes in accordance with the determined spectrumFUJITSU LTD·Filed 1996·Granted Apr 13, 1999·179 cites·26 claims
- 0295US6417945B2Optical wavelength multiplex transmission method and optical dispersion compensation methodFUJITSU LTD·Filed 2001·Granted Jul 9, 2002·30 cites·100 claims
- 0395US5737118AOptical amplifying apparatusFUJITSU LTD·Filed 1996·Granted Apr 7, 1998·117 cites·12 claims
- 0495US5696614AOptical wavelength multiplex transmission method and optical dispersion compensation methodFUJITSU LTD·Filed 1997·Granted Dec 9, 1997·85 cites·3 claims
- 0593US7362925B2Control method and control apparatus of optical deviceFUJITSU LTD·Filed 2005·Granted Apr 22, 2008·18 cites·2 claims
- 0693US6654561B1Method 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
- 0792US6351323B1Optical transmission apparatus, optical transmission system, and optical terminal stationFUJITSU LTD·Filed 1998·Granted Feb 26, 2002·87 cites·28 claims
- 0892US5867300AVariable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 1997·Granted Feb 2, 1999·79 cites·60 claims
- 0991US7848659B2Optical transmitting apparatus and optical communication systemFUJITSU LTD·Filed 2005·Granted Dec 7, 2010·22 cites·19 claims
- 1091US6941078B1Method and system for communicating a clock signal over an optical linkFUJITSU LTD·Filed 2001·Granted Sep 6, 2005·41 cites·16 claims
- 1191US6847662B2Wavelength-selectable laser capable of high-speed frequency controlFUJITSU LTD·Filed 2003·Granted Jan 25, 2005·38 cites·35 claims
- 1291US6782017B1Wavelength locker and wavelength discriminating apparatusFUJITSU LTD·Filed 2000·Granted Aug 24, 2004·51 cites·18 claims
- 1391US5696859AOptical-filter array, optical transmitter and optical transmission systemFUJITSU LTD·Filed 1995·Granted Dec 9, 1997·108 cites·12 claims
- 1490US6583900B2Optical transmission apparatus, optical transmission system, and optical terminal stationFUJITSU LTD·Filed 2001·Granted Jun 24, 2003·27 cites·26 claims
- 1590US5602666AOptical dispersion compensation method for shifting a zero dispersion wavelength of an optical fiber to compensate for dispersion in an optical systemFUJITSU LTD·Filed 1995·Granted Feb 11, 1997·56 cites·19 claims
- 1689US5841557AMethod 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
- 1788US5636046AOptical dispersion compensation method using transmissible band determined from synergetic effect of self phase modulation and group velocity dispersionFUJITSU LTD·Filed 1995·Granted Jun 3, 1997·48 cites·12 claims
- 1887US7822204B2Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication systemFUJITSU LTD·Filed 2006·Granted Oct 26, 2010·18 cites·26 claims
- 1987US7606504B2Optical receiver and optical receiving method corresponding to differential M-phase shift keying systemFUJITSU LTD·Filed 2006·Granted Oct 20, 2009·15 cites·14 claims
- 2087US5973821AVariable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of light signalFUJITSU LTD·Filed 1998·Granted Oct 26, 1999·50 cites·9 claims
- 2186US7471790B2Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, and communication systemFUJITSU LTD·Filed 2006·Granted Dec 30, 2008·15 cites·24 claims
- 2286US6384943B2Optical wavelength multiplex transmission method and optical dispersion compensation methodFUJITSU LTD·Filed 2001·Granted May 7, 2002·13 cites·44 claims
- 2385US7006771B1Optical communication apparatus and optical add/drop apparatusFUJITSU LTD·Filed 2000·Granted Feb 28, 2006·14 cites·34 claims
- 2484US7631378B2Optical waveform shaperFUJITSU LTD·Filed 2005·Granted Dec 15, 2009·8 cites·23 claims
- 2584US6067187AOptical amplifier and optical communication system employing the sameFUJITSU LTD·Filed 1996·Granted May 23, 2000·60 cites·28 claims
- 2683US7035543B1Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signalsFUJITSU LTD·Filed 2001·Granted Apr 25, 2006·18 cites·14 claims
- 2783US6243176B1Optical wavelength multiplex transmission method and optical dispersion compensation methodFUJITSU LTD·Filed 1997·Granted Jun 5, 2001·34 cites·116 claims
- 2882US5646399ATunable optical filter having beam splitter and movable film filterFUJITSU LTD·Filed 1996·Granted Jul 8, 1997·60 cites·15 claims
- 2982US4965858APolarization diversity optical receiver for coherent optical communicationFUJITSU LTD·Filed 1989·Granted Oct 23, 1990·57 cites·39 claims
- 3080US7088922B2Wavelength division multiplexing optical communication systemFUJITSU LTD·Filed 2003·Granted Aug 8, 2006·15 cites·14 claims
- 3180US5612807AOptical dispersion compensation method for shifting a zero dispersion wavelength of an optical fiber to compensate for dispersion in an optical systemFUJITSU LTD·Filed 1995·Granted Mar 18, 1997·31 cites·19 claims
- 3279US7860408B2Interferometer for demodulating differential M-phase shift keying signalFUJITSU LTD·Filed 2007·Granted Dec 28, 2010·9 cites·2 claims
- 3379US7577368B2Optical communication apparatus and optical add/drop apparatusFUJITSU LTD·Filed 2007·Granted Aug 18, 2009·4 cites·4 claims
- 3479US6934433B2Control method and control apparatus of optical deviceFUJITSU LTD·Filed 2002·Granted Aug 23, 2005·17 cites·38 claims
- 3579US6288834B1Optical amplifier for amplifying light in a long wavelength bandFUJITSU LTD·Filed 1999·Granted Sep 11, 2001·49 cites·48 claims
- 3677US6285479B1Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unitFUJITSU LTD·Filed 1998·Granted Sep 4, 2001·66 cites·5 claims
- 3777US5596448ADispersion compensator and optical amplifierFUJITSU LTD·Filed 1995·Granted Jan 21, 1997·45 cites·13 claims
- 3876US7200338B2Method and system for communicating a clock signal over an optical linkFUJITSU LTD·Filed 2005·Granted Apr 3, 2007·5 cites·19 claims
- 3975US6411431B2Optical amplifier for amplifying light in a long wavelength bandFUJITSU LTD·Filed 2001·Granted Jun 25, 2002·13 cites·11 claims
- 4075US6333806B1Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 1998·Granted Dec 25, 2001·27 cites·13 claims
- 4174US6151158AMethod and device for optical amplification and system having the deviceFUJITSU LTD·Filed 1997·Granted Nov 21, 2000·39 cites·41 claims
- 4273US7483639B2Method and system for transmitting information in an optical communication system using distributed amplificationFUJITSU LTD·Filed 2001·Granted Jan 27, 2009·9 cites·20 claims
- 4373US7406262B2Optical transmission deviceFUJITSU LTD·Filed 2005·Granted Jul 29, 2008·5 cites·34 claims
- 4473US7292787B1Selected-wavelength tuning filter and optical add/drop multiplexerFUJITSU LTD·Filed 2000·Granted Nov 6, 2007·12 cites·17 claims
- 4573US6266180B1Optical fiber amplifier using optical fiber having a portion which suppresses nonlinear optical phenomenaFUJITSU LTD·Filed 1999·Granted Jul 24, 2001·37 cites·70 claims
- 4673US5469288AOptical filter, method of controlling transmission wavelength thereof, and optical receiver using the methodFUJITSU LTD·Filed 1993·Granted Nov 21, 1995·37 cites·12 claims
- 4772US6717713B2Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 2003·Granted Apr 6, 2004·8 cites·1 claims
- 4872US6538782B1Light branching/inserting apparatus and light branching apparatus using wavelength selection filterFUJITSU LTD·Filed 1998·Granted Mar 25, 2003·33 cites·44 claims
- 4971US7869715B2Dispersion compensating apparatus and dispersion compensation control methodFUJITSU LTD·Filed 2007·Granted Jan 11, 2011·4 cites·13 claims
- 5070US7127139B2Optical multiplexing method and optical multiplexer, and optical amplifier using sameFUJITSU LTD·Filed 2004·Granted Oct 24, 2006·12 cites·20 claims
Showing the top 50 of 88 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →