Inventor · disambiguated record
Hisao Nakashima
Also filed as: NAKASHIMA HISAO
103 granted patents·14 pending applications·699 citations·filing 1977–2025
99Inventor score
Top patents by PatentIndex Score
117 records- 0197US9048957B2Signal processing circuit, optical receiver, detector and method for compensating for waveform distortionNAKASHIMA HISAO·Filed 2010·Granted Jun 2, 2015·57 cites·16 claims
- 0296US8249464B2Optical receiver and method for optical receptionODA SHOICHIRO·Filed 2010·Granted Aug 21, 2012·32 cites·20 claims
- 0395US4503540APhase-locked semiconductor laser deviceHITACHI LTD·Filed 1982·Granted Mar 5, 1985·58 cites·4 claims
- 0494US8526828B2Optical transmitter and optical transmitter unitNAKASHIMA HISAO·Filed 2011·Granted Sep 3, 2013·21 cites·20 claims
- 0594US8406635B2Optical communication system and optical receiverNAKASHIMA HISAO·Filed 2009·Granted Mar 26, 2013·29 cites·11 claims
- 0694US8301039B2Delay processing apparatus, signal amplification apparatus, opto-electric conversion apparatus, analog-digital conversion apparatus, receiving apparatus, and receiving methodNISHIHARA MASATO·Filed 2009·Granted Oct 30, 2012·30 cites·20 claims
- 0792US10277313B2Transmission apparatus, transmission system, and transmission control methodFUJITSU LTD·Filed 2017·Granted Apr 30, 2019·10 cites·17 claims
- 0892US7720392B2Differential quadrature phase-shift modulator and method for setting driving voltage thereofFUJITSU LTD·Filed 2005·Granted May 18, 2010·23 cites·26 claims
- 0991US8649689B2Digital coherent receiving apparatusKOIZUMI NOBUKAZU·Filed 2010·Granted Feb 11, 2014·20 cites·7 claims
- 1090US8116635B2Polarization multiplexing and transmitting apparatusTANIMURA TAKAHITO·Filed 2008·Granted Feb 14, 2012·17 cites·20 claims
- 1189US8145069B2Optical transmitterTANAKA TOSHIKI·Filed 2007·Granted Mar 27, 2012·16 cites·9 claims
- 1289US7630650B2Multi-level modulation receiving deviceFUJITSU LTD·Filed 2007·Granted Dec 8, 2009·16 cites·8 claims
- 1388US10122489B2Polarization state detector, optical transmitter, and optical receiverFUJITSU LTD·Filed 2015·Granted Nov 6, 2018·7 cites·7 claims
- 1488US8331805B2Digital coherent optical receiverNAKASHIMA HISAO·Filed 2010·Granted Dec 11, 2012·10 cites·10 claims
- 1587US8391725B2Optical receiver for controlling wavelength of local oscillation light and local oscillation light control methodODA SHOICHIRO·Filed 2009·Granted Mar 5, 2013·14 cites·10 claims
- 1687US8331793B2Optical transmission apparatus and methodTAKEUCHI OSAMU·Filed 2010·Granted Dec 11, 2012·9 cites·16 claims
- 1787US7602322B2Analog-to-digital conversion controller, optical receiving device, optical receiving method, and waveform-distortion compensating deviceFUJITSU LTD·Filed 2008·Granted Oct 13, 2009·11 cites·33 claims
- 1885US10439732B2Receiving device and phase-error compensation methodFUJITSU LTD·Filed 2017·Granted Oct 8, 2019·5 cites·6 claims
- 1985US8532503B2Optical receiver and optical receiving methodNAKASHIMA HISAO·Filed 2009·Granted Sep 10, 2013·11 cites·14 claims
- 2084US8805207B2Distortion compensator, optical receiver, distortion compensator and optical receiver controlling methods, and optical transmission systemFUJITSU LTD·Filed 2013·Granted Aug 12, 2014·7 cites·6 claims
- 2184US8447190B2Distortion compensating apparatus, optical receiving apparatus, and optical transmitting and receiving systemTANIMURA TAKAHITO·Filed 2010·Granted May 21, 2013·8 cites·12 claims
- 2284US7680419B2Repeater and repeating methodFUJITSU LTD·Filed 2006·Granted Mar 16, 2010·9 cites·11 claims
- 2384US4905060ALight emitting device with disordered regionHITACHI LTD·Filed 1988·Granted Feb 27, 1990·45 cites·17 claims
- 2483US8693898B2Adaptive equalizer, optical receiver, and tap coefficient correcting methodKOIZUMI NOBUKAZU·Filed 2011·Granted Apr 8, 2014·8 cites·20 claims
- 2583US8078066B2Optical coherent receiver, frequency offset estimating apparatus and method for optical coherent receiverLI LEI·Filed 2008·Granted Dec 13, 2011·9 cites·9 claims
- 2682US9225459B2Optical transmission system, optical transmission apparatus, signal conditioning program, and signal conditioning methodFUJITSU LTD·Filed 2012·Granted Dec 29, 2015·6 cites·19 claims
- 2781US9654216B2Optical transmitter and waveform distortion correction methodFUJITSU LTD·Filed 2015·Granted May 16, 2017·4 cites·13 claims
- 2881US8660438B2Digital coherent receiver and receiving methodNAKASHIMA HISAO·Filed 2011·Granted Feb 25, 2014·6 cites·10 claims
- 2981US8086113B2Optical receiverNAKASHIMA HISAO·Filed 2008·Granted Dec 27, 2011·8 cites·18 claims
- 3081US4161701ASemiconductor laserHITACHI LTD·Filed 1977·Granted Jul 17, 1979·27 cites·6 claims
- 3180US8447186B2Distortion compensator, optical receiver, distortion compensator and optical receiver controlling methods, and optical transmission systemTANIMURA TAKAHITO·Filed 2009·Granted May 21, 2013·6 cites·20 claims
- 3279US11146428B2Adaptive equalizer, optical receiver, and adaptive equalization methodFUJITSU LTD·Filed 2020·Granted Oct 12, 2021·1 cites·8 claims
- 3379US8942574B2Light receiving device and light receiving methodFUJITSU LTD·Filed 2013·Granted Jan 27, 2015·4 cites·13 claims
- 3479US8103177B2Apparatus and method for frequency offset monitoring used in digital coherent optical receiverZHANG HUIJIAN·Filed 2009·Granted Jan 24, 2012·8 cites·11 claims
- 3578US7596315B2Wavelength division multiplexing optical transmission system and transmission wavelength control method thereforFUJITSU LTD·Filed 2004·Granted Sep 29, 2009·14 cites·8 claims
- 3678US7061669B2Optical apparatus with loss compensation capability and optical amplifier for loss compensationFUJITSU LTD·Filed 2004·Granted Jun 13, 2006·14 cites·14 claims
- 3777US9143260B2Optical transmission system, method of adjusting optical transmission device, and non-transitory computer-readable mediumFUJITSU LTD·Filed 2013·Granted Sep 22, 2015·4 cites·10 claims
- 3877US8625996B2Optical transmitter, optical transmission method, and wavelength-selective variable delayerTANAKA TOSHIKI·Filed 2007·Granted Jan 7, 2014·6 cites·10 claims
- 3977US7382979B2Wavelength dispersion compensation design method and a system thereofFUJITSU LTD·Filed 2005·Granted Jun 3, 2008·6 cites·11 claims
- 4076US8351795B2Optical transmission system and optical transmission methodFUJITSU LTD·Filed 2008·Granted Jan 8, 2013·5 cites·10 claims
- 4175US8873973B2Digital coherent receiver and phase control methodKOMAKI KOSUKE·Filed 2012·Granted Oct 28, 2014·4 cites·16 claims
- 4274US9906296B2Network controller and signal quality estimating methodFUJITSU LTD·Filed 2016·Granted Feb 27, 2018·2 cites·10 claims
- 4374US8351797B2Repeater and repeating methodFUJITSU LTD·Filed 2010·Granted Jan 8, 2013·3 cites·11 claims
- 4473US10567077B2Imbalance compensation device, transmission device, and imbalance compensation methodFUJITSU LTD·Filed 2018·Granted Feb 18, 2020·2 cites·6 claims
- 4573US10063322B2Optical transmitter and control method of optical transmitterFUJITSU LTD·Filed 2016·Granted Aug 28, 2018·2 cites·11 claims
- 4673US9467228B2Optical transmission system and optical transmission methodFUJITSU LTD·Filed 2014·Granted Oct 11, 2016·3 cites·7 claims
- 4772US9887798B2Transmission apparatus, reception apparatus and modulation methodFUJITSU LTD·Filed 2016·Granted Feb 6, 2018·2 cites·15 claims
- 4872US9634764B2Estimating device and method for estimatingFUJITSU LTD·Filed 2016·Granted Apr 25, 2017·2 cites·20 claims
- 4972US8744278B2Method for electric power supply of optical receiver, digital signal processing circuit, and optical receiverODA SHOICHIRO·Filed 2009·Granted Jun 3, 2014·5 cites·20 claims
- 5072US8515277B2Nonlinear distortion detecting circuit, optical receiver, optical transmission system, and method for detecting nonlinear distortionTANIMURA TAKAHITO·Filed 2010·Granted Aug 20, 2013·3 cites·8 claims
Showing the top 50 of 117 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →