Inventor · disambiguated record
Tsutomu Tajima
Also filed as: TAJIMA TSUTOMU
17 granted patents·6 pending applications·260 citations·filing 1985–2011
94Inventor score
Top patents by PatentIndex Score
23 records- 0182US6081359ATransmitting apparatus and receiving apparatus for wavelength-division-multiplex signal transmissionNEC CORP·Filed 1998·Granted Jun 27, 2000·73 cites·27 claims
- 0275US8725006B2Digital signal-to-signal beat noise reduction for filter-less coherent receiving systemHUANG YUE-KAI·Filed 2011·Granted May 13, 2014·4 cites·24 claims
- 0375US4864649ADriver circuit for driving a light emitting element by superimposing an analog sub-information signal over a digital main signalNEC CORP·Filed 1987·Granted Sep 5, 1989·53 cites·9 claims
- 0472US7920559B2Transponder, transmission system, transmission method and transmission programNEC CORP·Filed 2008·Granted Apr 5, 2011·6 cites·7 claims
- 0571US8064768B2Intra-channel equalizing optical interleaverJI PHILIP NAN·Filed 2008·Granted Nov 22, 2011·4 cites·10 claims
- 0670US5367397AWavelength-stabilizing method and its associated circuitry for an optical communication systemNEC CORP·Filed 1993·Granted Nov 22, 1994·28 cites·5 claims
- 0769USD296691SMegaphoneKK TAJIMA SANGYO·Filed 1985·Granted Jul 12, 1988·14 cites·1 claims
- 0866US8218977B2Integrated equalizer and Michelson interferometer structure for inter-symbol interference-suppressed colorless DPSK demodulationJI PHILIP NAN·Filed 2010·Granted Jul 10, 2012·2 cites·6 claims
- 0959US6420962B1Automatic identification level control circuit, identification level control method, automatic identification phase control circuit, identification phase control method, optical receiver, and optical communication systemNEC CORP·Filed 2000·Granted Jul 16, 2002·7 cites·33 claims
- 1051US8391706B2Optical signal division transmission system, optical transmitter, optical receiver, and optical signal division transmission methodYAMADA KEIICHI·Filed 2009·Granted Mar 5, 2013·0 cites·7 claims
- 1150US5926304AOptical fiber amp repeater of amplifying an optical signal and superimposing an auxiliary signalNEC CORP·Filed 1997·Granted Jul 20, 1999·18 cites·12 claims
- 1249US2008240736A1Inter-Symbol Interference-Suppressed Colorless DPSK DemodulationNEC LAB AMERICA INC·Filed 2007·Application pending·0 cites
- 1346US5726794ADC bias controller for optical modulatorNEC CORP·Filed 1995·Granted Mar 10, 1998·21 cites·20 claims
- 1445US2009180785A1Optical transmitter, optical transmission system and modulation scheme selection methodTAJIMA TSUTOMU·Filed 2009·Application pending·0 cites
- 1544US8718474B2Chromatic dispersion compensation using sign operations and lookup tablesQIAN DAYOU·Filed 2011·Granted May 6, 2014·0 cites·10 claims
- 1643US2008002972A1All Order Polarization Mode Dispersion Compensation with Spectral Interference Based Pulse ShapingNEC LAB AMERICA INC·Filed 2007·Application pending·0 cites
- 1742US2008199189A1Colorless optical demodulator for differential quadrature phase shift keying dwdm systemsNEC AMERICA INC·Filed 2007·Application pending·0 cites
- 1842US2007206898A1Optical equalization filtering of dwdm channelsNEC LAB AMERICA·Filed 2007·Application pending·0 cites
- 1937US6522675B1Wavelength control circuit and wavelength control method of light emitting deviceNEC CORP·Filed 1999·Granted Feb 18, 2003·7 cites·20 claims
- 2037US6055093AOptical amplifying apparatus and linear relay optical amplifier transmitterNEC CORP·Filed 1997·Granted Apr 25, 2000·10 cites·6 claims
- 2137US5995276AWavelength-division-multiplexing optical amplifier device and wavelength-division-multiplexing optical transmission systemNEC CORP·Filed 1997·Granted Nov 30, 1999·8 cites·24 claims
- 2235US5768000AWavelength multiplexing optical transmission deviceNEC CORP·Filed 1996·Granted Jun 16, 1998·5 cites·3 claims
- 2335US2011286746A1Transponder Aggregator Without Wavelength Selector for Colorless and Directionless Multi-Degree ROADM NodeJI PHILIP NAN·Filed 2010·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Tsutomu Tajima files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →