Inventor · disambiguated record
Hiroaki Tomofuji
Also filed as: TOMOFUJI HIROAKI
38 granted patents·3 pending applications·955 citations·filing 1993–2016
98Inventor score
Files withFUJITSU LTD40
Top patents by PatentIndex Score
41 records- 0194US6639716B1Wavelength division multiplexing optical communication system and optical amplifying deviceFUJITSU LTD·Filed 2000·Granted Oct 28, 2003·50 cites·24 claims
- 0293US6654561B1Method 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
- 0390US5815294AOptical transmission system with transmission characteristic measuring deviceFUJITSU LTD·Filed 1997·Granted Sep 29, 1998·71 cites·7 claims
- 0489US5805322AMultiplex optical communication systemFUJITSU LTD·Filed 1996·Granted Sep 8, 1998·66 cites·17 claims
- 0587US5383046ASupervisory and control signal transmitting system for use in optically amplifying repeaters systemFUJITSU LTD·Filed 1993·Granted Jan 17, 1995·100 cites·24 claims
- 0686US6570703B2Optical amplifying apparatus, optical amplifying method, and optical communication systemFUJITSU LTD·Filed 2001·Granted May 27, 2003·25 cites·12 claims
- 0785US6483636B1Optical amplifierFUJITSU LTD·Filed 2000·Granted Nov 19, 2002·34 cites·23 claims
- 0884US5896217AOptical transmission system, optical multiplexing transmission system, and related peripheral techniquesFUJITSU LTD·Filed 1997·Granted Apr 20, 1999·46 cites·11 claims
- 0983US6839162B2Optical amplifying apparatus and optical communication systemFUJITSU LTD·Filed 2001·Granted Jan 4, 2005·25 cites·21 claims
- 1083US6411429B1Optical amplifying apparatus, wide-band optical amplifying apparatus, and optical communication systemFUJITSU LTD·Filed 2000·Granted Jun 25, 2002·28 cites·48 claims
- 1183US5991477AOptical transmission system, optical multiplexing transmission system, and related peripheral techniquesFUJITSU LTD·Filed 1998·Granted Nov 23, 1999·80 cites·11 claims
- 1283US5754322AOptical transmission system, optical multiplexing transmission system, and related peripheral techniquesFUJITSU LTD·Filed 1997·Granted May 19, 1998·43 cites·18 claims
- 1382US7522839B2Method of upgrading optical node, and an optical node apparatusFUJITSU LTD·Filed 2005·Granted Apr 21, 2009·8 cites·11 claims
- 1481US5909297ADrift compensating circuit for optical modulators in an optical systemFUJITSU LTD·Filed 1997·Granted Jun 1, 1999·70 cites·14 claims
- 1580US7088922B2Wavelength division multiplexing optical communication systemFUJITSU LTD·Filed 2003·Granted Aug 8, 2006·15 cites·14 claims
- 1679US9537570B2Optical transceiving apparatus, optical transmitting method, and optical transmitting deviceFUJITSU LTD·Filed 2013·Granted Jan 3, 2017·4 cites·9 claims
- 1778US6987903B2Optical transmission network, optical transmission apparatus, dispersion compensator arrangement calculation apparatus and dispersion compensator arrangement calculation methodFUJITSU LTD·Filed 2005·Granted Jan 17, 2006·7 cites·26 claims
- 1878US6903324B2Optical amplifier amplifying wavelength multiplexed light, and wavelength multiplexed light communications systemFUJITSU LTD·Filed 2002·Granted Jun 7, 2005·19 cites·17 claims
- 1977US7343102B2Optical transmission system with automatic signal level adjustment and startup functionsFUJITSU LTD·Filed 2004·Granted Mar 11, 2008·16 cites·22 claims
- 2076US7286758B2Method for switching transmission route, and optical transmission deviceFUJITSU LTD·Filed 2006·Granted Oct 23, 2007·6 cites·8 claims
- 2175US5870213AOptical transmission system, optical multiplexing transmission system, and related peripheral techniquesFUJITSU LTD·Filed 1998·Granted Feb 9, 1999·51 cites·16 claims
- 2274US7650072B2Method of upgrading optical node, and an optical node apparatusFUJITSU LTD·Filed 2009·Granted Jan 19, 2010·4 cites·16 claims
- 2373US7466478B2Optical-level control method, optical-level control apparatus and wavelength-multiplexing optical networkFUJITSU LTD·Filed 2005·Granted Dec 16, 2008·6 cites·5 claims
- 2472US7509055B2Optical transmission system with automatic signal level adjustment and startup functionsFUJITSU LTD·Filed 2008·Granted Mar 24, 2009·4 cites·2 claims
- 2570US6600584B2Multiplex optical communication systemFUJITSU LTD·Filed 2001·Granted Jul 29, 2003·6 cites·21 claims
- 2669US5760937AOptical demultiplexerFUJITSU LTD·Filed 1997·Granted Jun 2, 1998·39 cites·11 claims
- 2765US7756416B2Optical communication node and optical network systemFUJITSU LTD·Filed 2003·Granted Jul 13, 2010·6 cites·6 claims
- 2864US7433600B2Optical node device and system including the deviceFUJITSU LTD·Filed 2001·Granted Oct 7, 2008·6 cites·14 claims
- 2963US7200333B2Optical communication apparatus, system, and method that properly compensate for chromatic dispersionFUJITSU LTD·Filed 2001·Granted Apr 3, 2007·7 cites·31 claims
- 3061US6348987B1Multiplex optical communication systemFUJITSU LTD·Filed 1998·Granted Feb 19, 2002·16 cites·17 claims
- 3160US7062173B2Optical device and wavelength division multiplexing communication system using sameFUJITSU LTD·Filed 2001·Granted Jun 13, 2006·6 cites·18 claims
- 3257US6850581B2Timing circuitFUJITSU LTD·Filed 2002·Granted Feb 1, 2005·6 cites·5 claims
- 3354US7394951B2Optical signal level control apparatusFUJITSU LTD·Filed 2003·Granted Jul 1, 2008·2 cites·47 claims
- 3449US10044463B2Optical transceiving apparatus, optical transmitting method, and optical transmitting deviceFUJITSU LTD·Filed 2016·Granted Aug 7, 2018·0 cites·5 claims
- 3549US9124382B2Transmission device, transmission system, and method for adjusting passbandFUJITSU LTD·Filed 2013·Granted Sep 1, 2015·0 cites·9 claims
- 3648US7254334B2Multiplex optical communication systemFUJITSU LTD·Filed 2003·Granted Aug 7, 2007·0 cites·6 claims
- 3747US6496552B2Timing circuitFUJITSU LTD·Filed 1998·Granted Dec 17, 2002·17 cites·10 claims
- 3843US2003228148A1Optical ring network system having a plurality of node apparatuses connected in a ringFUJITSU LTD·Filed 2003·Application pending·0 cites
- 3943US2004161241A1Apparatus for compensating for dispersion and wavelength division multiplexing communications system using the apparatusFiled 2004·Application pending·0 cites
- 4042US2004184809A1Optical transmission apparatus and an optical wavelength multiplex network therewithFUJITSU LTD·Filed 2004·Application pending·0 cites
- 4136US6662317B2Method and apparatus for chromatic dispersion equalizationFUJITSU LTD·Filed 1999·Granted Dec 9, 2003·6 cites·20 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →