Inventor · disambiguated record
Yutaka Kai
Also filed as: KAI YUTAKA
61 granted patents·15 pending applications·619 citations·filing 1998–2022
98Inventor score
Top patents by PatentIndex Score
76 records- 0197US7817923B2Optical transmitting apparatus, optical receiving apparatus, and optical communication system comprising themFUJITSU LTD·Filed 2005·Granted Oct 19, 2010·55 cites·37 claims
- 0293US9467229B2Multilevel intensity modulation and demodulation system and methodFUJITSU LTD·Filed 2015·Granted Oct 11, 2016·12 cites·12 claims
- 0393US7362925B2Control method and control apparatus of optical deviceFUJITSU LTD·Filed 2005·Granted Apr 22, 2008·18 cites·2 claims
- 0492US8538259B2Optical access network systemKAI YUTAKA·Filed 2012·Granted Sep 17, 2013·9 cites·16 claims
- 0592US6351323B1Optical transmission apparatus, optical transmission system, and optical terminal stationFUJITSU LTD·Filed 1998·Granted Feb 26, 2002·87 cites·28 claims
- 0691US8867927B2Optical transmitting apparatus, optical receiving apparatus, and optical communication system comprising themAKIYAMA YUICHI·Filed 2010·Granted Oct 21, 2014·7 cites·12 claims
- 0791US6782017B1Wavelength locker and wavelength discriminating apparatusFUJITSU LTD·Filed 2000·Granted Aug 24, 2004·51 cites·18 claims
- 0890US6583900B2Optical transmission apparatus, optical transmission system, and optical terminal stationFUJITSU LTD·Filed 2001·Granted Jun 24, 2003·27 cites·26 claims
- 0987US6278536B1Optical transmission device for bi-directional optical communicationFUJITSU LTD·Filed 1998·Granted Aug 21, 2001·74 cites·59 claims
- 1085US7643751B2Network managing apparatus, optical add/drop multiplexer, and network managing methodFUJITSU LTD·Filed 2007·Granted Jan 5, 2010·10 cites·6 claims
- 1185US7433601B2Optical network and optical add/drop apparatusFUJITSU LTD·Filed 2005·Granted Oct 7, 2008·11 cites·16 claims
- 1282US9876601B2Optical transmission system, controller for wavelength tunable filter, and control method of wavelength tunable filterFUJITSU LTD·Filed 2016·Granted Jan 23, 2018·4 cites·20 claims
- 1380US9853728B2Method for determining numbers of bits allocated to subcarriers and optical transmission systemFUJITSU LTD·Filed 2016·Granted Dec 26, 2017·3 cites·7 claims
- 1480US6785306B2Wavelength-tunable stabilizer laserFUJITSU LTD·Filed 2000·Granted Aug 31, 2004·16 cites·18 claims
- 1579US8170416B2Optical switching deviceKAI YUTAKA·Filed 2008·Granted May 1, 2012·7 cites·8 claims
- 1679US6934433B2Control method and control apparatus of optical deviceFUJITSU LTD·Filed 2002·Granted Aug 23, 2005·17 cites·38 claims
- 1777US9425897B2Transmission apparatus, transmission system, and transmission methodFUJITSU LTD·Filed 2014·Granted Aug 23, 2016·3 cites·12 claims
- 1877US6285479B1Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unitFUJITSU LTD·Filed 1998·Granted Sep 4, 2001·66 cites·5 claims
- 1976US8463135B2Relay apparatus, signal processing apparatus and optical communication systemSONE KYOSUKE·Filed 2010·Granted Jun 11, 2013·4 cites·12 claims
- 2074US9998230B2Optical transmitter, optical communication system, and optical transmission/reception control methodFUJITSU LTD·Filed 2017·Granted Jun 12, 2018·2 cites·7 claims
- 2173US7462812B2Optical switch apparatus and optical switching systemFUJITSU LTD·Filed 2008·Granted Dec 9, 2008·4 cites·3 claims
- 2273US7406262B2Optical transmission deviceFUJITSU LTD·Filed 2005·Granted Jul 29, 2008·5 cites·34 claims
- 2373US7292787B1Selected-wavelength tuning filter and optical add/drop multiplexerFUJITSU LTD·Filed 2000·Granted Nov 6, 2007·12 cites·17 claims
- 2472US8582984B2Waveform controller, responsive element module, optical switch apparatus, responsive element and optical switch apparatus control methodKAI YUTAKA·Filed 2009·Granted Nov 12, 2013·6 cites·19 claims
- 2570US7181094B2Apparatus for controlling acousto-optic tunable filter and method of selecting wavelengthFUJITSU LTD·Filed 2005·Granted Feb 20, 2007·3 cites·6 claims
- 2669US6996142B2Light source device and wavelength control device thereforFUJITSU LTD·Filed 2001·Granted Feb 7, 2006·9 cites·24 claims
- 2767US7826744B2Optical network system and transmission apparatusFUJITSU LTD·Filed 2005·Granted Nov 2, 2010·3 cites·18 claims
- 2866US8019219B2Optical packet switching apparatus and method thereforFUJITSU LTD·Filed 2008·Granted Sep 13, 2011·2 cites·6 claims
- 2966US7546043B2Optical communication systemFUJITSU LTD·Filed 2004·Granted Jun 9, 2009·6 cites·16 claims
- 3064US9973276B2Optical receiving device and method for controlling dispersion compensation amountFUJITSU LTD·Filed 2017·Granted May 15, 2018·1 cites·12 claims
- 3164US7791793B2Semiconductor optical amplifier gate switch drive circuit, semiconductor optical amplifier gate switching device, and optical cross connectFUJITSU LTD·Filed 2007·Granted Sep 7, 2010·2 cites·9 claims
- 3264US7368700B2Optical switch apparatus and optical switching systemFUJITSU LTD·Filed 2006·Granted May 6, 2008·2 cites·16 claims
- 3364US6154588ADispersion compensation apparatusFUJITSU LTD·Filed 1998·Granted Nov 28, 2000·26 cites·24 claims
- 3463US10027408B2Multi-carrier optical transmission system, optical transmitter, and optical receiverFUJITSU LTD·Filed 2016·Granted Jul 17, 2018·1 cites·11 claims
- 3563US7308168B2Optical switch apparatus and control information updating method thereinFUJITSU LTD·Filed 2005·Granted Dec 11, 2007·2 cites·21 claims
- 3662US6895141B2Control method and device for optical filter, and optical node deviceFUJITSU LTD·Filed 2002·Granted May 17, 2005·6 cites·21 claims
- 3761US7898341B2Non-inverting amplifier circuit and optical switch driver circuitFUJITSU LTD·Filed 2008·Granted Mar 1, 2011·4 cites·4 claims
- 3861US7187814B2Optical add/drop deviceFUJITSU LTD·Filed 2004·Granted Mar 6, 2007·5 cites·8 claims
- 3961US6545784B2Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unitFUJITSU LTD·Filed 2001·Granted Apr 8, 2003·4 cites·7 claims
- 4060US7366426B2Optical add/drop multiplexer using tunable filter and method for feedback controlling the tunable filterFUJITSU LTD·Filed 2004·Granted Apr 29, 2008·4 cites·12 claims
- 4156US12505379B2Computer-readable recording medium storing machine learning program, machine learning method, and information processing device of improving performance of learning skip in training machine learning modelFUJITSU LTD·Filed 2021·Granted Dec 23, 2025·0 cites·9 claims
- 4256US8331780B2Optical packet switching apparatus and optical packet switching methodKAI YUTAKA·Filed 2009·Granted Dec 11, 2012·1 cites·11 claims
- 4356US8032028B2Optical add/drop deviceFUJITSU LTD·Filed 2007·Granted Oct 4, 2011·1 cites·14 claims
- 4456US6947630B2Control method and control apparatus for variable wavelength optical filterFUJITSU LTD·Filed 2002·Granted Sep 20, 2005·5 cites·22 claims
- 4556US6462844B1Wavelength-division multiplexing transmission system, a method for designing a loss difference compensator for optical devices used in the wavelength-division multiplexing transmission system, and a method for configuring the wavelength-division multiplexing transmission systemFUJITSU LTD·Filed 1999·Granted Oct 8, 2002·22 cites·46 claims
- 4656US2023095268A1Storage medium, machine learning method, and information processing apparatusFUJITSU LTD·Filed 2022·Application pending·0 cites
- 4756US2023083790A1Computer-readable recording medium storing speed-up program, speed-up method, and information processing deviceFUJITSU LTD·Filed 2022·Application pending·0 cites
- 4853US7848600B2Driving circuit of optical gate switchFUJITSU LTD·Filed 2007·Granted Dec 7, 2010·0 cites·7 claims
- 4952US8107813B2Drive circuit and optical switchYOSHIDA SETSUO·Filed 2009·Granted Jan 31, 2012·0 cites·8 claims
- 5051US2009185804A1Optical access network systemFUJITSU LTD·Filed 2008·Application pending·0 cites
Showing the top 50 of 76 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →