Inventor · disambiguated record
Katsumi Iwatsuki
Also filed as: IWATSUKI KATSUMI
22 granted patents·1 pending application·394 citations·filing 1995–2023
96Inventor score
Top patents by PatentIndex Score
23 records- 0194US7106970B2Polarization scrambler and optical network using the sameNIPPON TELEGRAPH & TELEPHONE·Filed 2005·Granted Sep 12, 2006·19 cites·7 claims
- 0293US7389048B2Optical wavelength-division multiple access system and optical network unitNIPPON TELEGRAPH & TELEPHONE·Filed 2004·Granted Jun 17, 2008·52 cites·9 claims
- 0391US8014672B2Optical wavelength multiplexing access systemNIPPON TELEGRAPH & TELEPHONE·Filed 2007·Granted Sep 6, 2011·23 cites·18 claims
- 0491US7155127B2Optical communication system, optical communication unit, and optical transceiving packageNIPPON TELEGRAPH & TELEPHONE·Filed 2002·Granted Dec 26, 2006·44 cites·12 claims
- 0590US7474460B2Optical modulation apparatusNIPPON TELEGRAPH & TELEPHONE·Filed 2007·Granted Jan 6, 2009·17 cites·9 claims
- 0690US7433594B2Node apparatus, optical wavelength division multiplexing network, and system switching methodNIPPON TELEGRAPH & TELEPHONE·Filed 2006·Granted Oct 7, 2008·16 cites·6 claims
- 0788US7164861B2Node apparatus, optical wavelength division multiplexing network, and system switching methodNIPPON TELEGRAPH & TELEPHONE·Filed 2001·Granted Jan 16, 2007·29 cites·16 claims
- 0887US6959152B2Polarization scrambler and optical network using the sameNIPPON TELEGRAPH & TELEPHONE·Filed 2003·Granted Oct 25, 2005·30 cites·42 claims
- 0985US7203422B2Optical network unit, wavelength splitter, and optical wavelength-division multiplexing access systemNIPPON TELEGRAPH & TELEPHONE·Filed 2003·Granted Apr 10, 2007·24 cites·25 claims
- 1084US7127168B2Multi-wavelength optical modulation circuit and wavelength-division multiplexed optical signal transmitterNIPPON TELEGRAPH & TELEPHONE·Filed 2002·Granted Oct 24, 2006·31 cites·32 claims
- 1180US7031614B2Polarization scrambler and optical network using the sameNIPPON TELEGRAPH & TELEPHONE·Filed 2005·Granted Apr 18, 2006·7 cites·5 claims
- 1278US5724126AMethod for measuring distribution of zero dispersion wavelengths in an optical fiber and apparatus thereforNIPPON TELEGRAPH & TELEPHONE·Filed 1995·Granted Mar 3, 1998·40 cites·31 claims
- 1370US7555215B2Optical wavelength division multiplexing access systemNIPPON TELEGRAPH & TELEPHONE·Filed 2004·Granted Jun 30, 2009·12 cites·27 claims
- 1466US7460572B2Optical module and method for monitoring and controlling wavelengthsNIPPON TELEGRAPH & TELEPHONE·Filed 2004·Granted Dec 2, 2008·9 cites·6 claims
- 1561US7206510B2Ring network using multi-wavelength generatorNIPPON TELEGRAPH & TELEPHONE·Filed 2002·Granted Apr 17, 2007·5 cites·53 claims
- 1659US12424848B2Power systemUNIV TOHOKU·Filed 2023·Granted Sep 23, 2025·0 cites·8 claims
- 1756US7869717B2Optical communication light source unit and wavelength monitoring control methodNIPPON TELEGRAPH & TELEPHONE·Filed 2006·Granted Jan 11, 2011·1 cites·60 claims
- 1853US5764841AOptical fiber transmission line, optical fiber transmission system and production method thereof, and optical fiber combining methodNIPPON TELEGRAPH & TELEPHONE·Filed 1997·Granted Jun 9, 1998·21 cites·10 claims
- 1947US11848556B2Power and communications network convergence system, and control method thereinUNIV TOHOKU·Filed 2020·Granted Dec 19, 2023·0 cites·7 claims
- 2046US7336414B2Optical modulating deviceNIPPON TELEGRAPH & TELEPHONE·Filed 2004·Granted Feb 26, 2008·0 cites·14 claims
- 2145US5986789AOptical transmission line and optical transmission systemNIPPON TELEGRAPH & TELEPHONE·Filed 1997·Granted Nov 16, 1999·14 cites·13 claims
- 2244US2024405542A1Autonomous Cooperative Control System and Autonomous Cooperative Control MethodUNIV TOHOKU·Filed 2021·Application pending·0 cites
- 2341US7076166B2Low-cost optical burst transmission system, apparatus, and methodNIPPON TELEGRAPH & TELEPHONE·Filed 2002·Granted Jul 11, 2006·0 cites·18 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →