Inventor
TOMOFUJI HIROAKI
JP38 patents
Patents
38 patentsUS5991477ANov 23, 1999
Optical transmission system, optical multiplexing transmission system, and related peripheral techniques
FUJITSU LTD80 citations97
US5909297AJun 1, 1999
Drift compensating circuit for optical modulators in an optical system
FUJITSU LTD70 citations97
US5815294ASep 29, 1998
Optical transmission system with transmission characteristic measuring device
FUJITSU LTD71 citations97
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
US5896217AApr 20, 1999
Optical transmission system, optical multiplexing transmission system, and related peripheral techniques
FUJITSU LTD46 citations96
US5870213AFeb 9, 1999
Optical transmission system, optical multiplexing transmission system, and related peripheral techniques
FUJITSU LTD51 citations96
US5805322ASep 8, 1998
Multiplex optical communication system
FUJITSU LTD66 citations96
US5760937AJun 2, 1998
Optical demultiplexer
FUJITSU LTD39 citations96
US5754322AMay 19, 1998
Optical transmission system, optical multiplexing transmission system, and related peripheral techniques
FUJITSU LTD43 citations96
US5383046AJan 17, 1995
Supervisory and control signal transmitting system for use in optically amplifying repeaters system
FUJITSU LTD100 citations96
US6839162B2Jan 4, 2005
Optical amplifying apparatus and optical communication system
FUJITSU LTD25 citations93
US6496552B2Dec 17, 2002
Timing circuit
FUJITSU LTD17 citations93
US6639716B1Oct 28, 2003
Wavelength division multiplexing optical communication system and optical amplifying device
FUJITSU LTD50 citations92
US6570703B2May 27, 2003
Optical amplifying apparatus, optical amplifying method, and optical communication system
FUJITSU LTD25 citations92
US6411429B1Jun 25, 2002
Optical amplifying apparatus, wide-band optical amplifying apparatus, and optical communication system
FUJITSU LTD28 citations92
US6348987B1Feb 19, 2002
Multiplex optical communication system
FUJITSU LTD16 citations92
US6483636B1Nov 19, 2002
Optical amplifier
FUJITSU LTD34 citations91
US7088922B2Aug 8, 2006
Wavelength division multiplexing optical communication system
FUJITSU LTD15 citations84
US6903324B2Jun 7, 2005
Optical amplifier amplifying wavelength multiplexed light, and wavelength multiplexed light communications system
FUJITSU LTD19 citations84
US7522839B2Apr 21, 2009
Method of upgrading optical node, and an optical node apparatus
FUJITSU LTD8 citations83
US7343102B2Mar 11, 2008
Optical transmission system with automatic signal level adjustment and startup functions
FUJITSU LTD16 citations83
US7200333B2Apr 3, 2007
Optical communication apparatus, system, and method that properly compensate for chromatic dispersion
FUJITSU LTD7 citations74
US6987903B2Jan 17, 2006
Optical transmission network, optical transmission apparatus, dispersion compensator arrangement calculation apparatus and dispersion compensator arrangement calculation method
FUJITSU LTD7 citations74
US6850581B2Feb 1, 2005
Timing circuit
FUJITSU LTD6 citations74
US6600584B2Jul 29, 2003
Multiplex optical communication system
FUJITSU LTD6 citations74
US9537570B2Jan 3, 2017
Optical transceiving apparatus, optical transmitting method, and optical transmitting device
FUJITSU LTD4 citations73
US7756416B2Jul 13, 2010
Optical communication node and optical network system
FUJITSU LTD6 citations63
US7433600B2Oct 7, 2008
Optical node device and system including the device
FUJITSU LTD6 citations63
US7394951B2Jul 1, 2008
Optical signal level control apparatus
FUJITSU LTD2 citations63
US7286758B2Oct 23, 2007
Method for switching transmission route, and optical transmission device
FUJITSU LTD6 citations63
US7062173B2Jun 13, 2006
Optical device and wavelength division multiplexing communication system using same
FUJITSU LTD6 citations63
US6662317B2Dec 9, 2003
Method and apparatus for chromatic dispersion equalization
FUJITSU LTD6 citations63
US7509055B2Mar 24, 2009
Optical transmission system with automatic signal level adjustment and startup functions
FUJITSU LTD4 citations62
US7650072B2Jan 19, 2010
Method of upgrading optical node, and an optical node apparatus
FUJITSU LTD4 citations61
US7466478B2Dec 16, 2008
Optical-level control method, optical-level control apparatus and wavelength-multiplexing optical network
FUJITSU LTD6 citations59
US10044463B2Aug 7, 2018
Optical transceiving apparatus, optical transmitting method, and optical transmitting device
FUJITSU LTD0 citations52
US7254334B2Aug 7, 2007
Multiplex optical communication system
FUJITSU LTD0 citations52
US9124382B2Sep 1, 2015
Transmission device, transmission system, and method for adjusting passband
FUJITSU LTD0 citations50