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For the Inventor, By the Inventor

Tokyo, Japan

Tsutomu Tajima

This inventor holds 17 USPTO granted patents and 2 published patent applications and 1 EPO patent, primarily in Optical Communication. Top assignees: Nec Corporation, Nec Laboratories America, Inc., Kabushiki Kaisha Tajima Sangyo. Active years: 1988-2014.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tsutomu Tajima. Retrieved from https://idiyas.com/inventor/tsutomu-tajima

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Calculating rank
USPTO Granted Patents = 17 

% Patents Active = 88.2

 

Average Co-Inventor Count = 1.8

ph-index = 6

Forward Citations = 132(Granted Patents)


Location History:

  • Tokyo, JP (1988 - 2013)
  • Princeton, NJ (US) (2014)
  • Chiba, JP (2014)

Company Filing History:

goldMedal14 out of 36,735 
 
Nec Corporation
 patents
silverMedal4 out of 718 
 
Nec Laboratories America, Inc.
 patents
bronzeMedal1 out of 1 
 
Kabushiki Kaisha Tajima Sangyo
 patent
where one patent can have more than one assignee

Years Active: 1988-2014

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Areas of Expertise:
Optical Signal Transmission
Wavelength Control
Noise Reduction
Optical Receiver
DPSK Demodulation
Optical Amplifier
Inter-Symbol Interference
Chromatic Dispersion
Transmission Method
Light Emitting Device
Optical Fiber
Equalizer
17 patents (USPTO):Explore Patents
1. 8725006 - Digital signal-to-signal beat noise reduction for filter-less coherent receiving system (2014-05-13),
2. 8718474 - Chromatic dispersion compensation using sign operations and lookup tables (2014-05-06),
3. 8391706 - Optical signal division transmission system, optical transmitter, optical receiver, and optical signal division transmission method (2013-03-05),
4. 8218977 - Integrated equalizer and Michelson interferometer structure for inter-symbol interference-suppressed colorless DPSK demodulation (2012-07-10),
5. 8064768 - Intra-channel equalizing optical interleaver (2011-11-22),
6. 7920559 - Transponder, transmission system, transmission method and transmission program (2011-04-05),
7. 6522675 - Wavelength control circuit and wavelength control method of light emitting device (2003-02-18),
8. 6420962 - AUTOMATIC IDENTIFICATION LEVEL CONTROL CIRCUIT, IDENTIFICATION LEVEL CONTROL METHOD, AUTOMATIC IDENTIFICATION PHASE CONTROL CIRCUIT, IDENTIFICATION PHASE CONTROL METHOD, OPTICAL RECEIVER, AND OPTICAL COMMUNICATION SYSTEM (2002-07-16),
9. 6081359 - Transmitting apparatus and receiving apparatus for (2000-06-27),
10. 6055093 - Optical amplifying apparatus and linear relay optical amplifier (2000-04-25),
11. 5995276 - Wavelength-division-multiplexing optical amplifier device and (1999-11-30),
12. 5926304 - Optical fiber amp repeater of amplifying an optical signal and (1999-07-20),
13. 5768000 - Wavelength multiplexing optical transmission device (1998-06-16),
14. 5726794 - DC bias controller for optical modulator (1998-03-10),
15. 5367397 - Wavelength-stabilizing method and its associated circuitry for an (1994-11-22),

Title: Tsutomu Tajima: Innovator in Signal Processing Technologies

Introduction

Tsutomu Tajima is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of signal processing, holding a total of 17 patents. His work focuses on developing advanced technologies that enhance communication systems.

Latest Patents

Among his latest patents is a system for digital signal-to-signal beat noise reduction for filter-less coherent receiving systems. This innovation includes a filter-less coherent receiver frontend, a signal-signal beat-noise detector, and a real-time processor designed to reject signal-signal interference. Another notable patent involves chromatic dispersion compensation using sign operations and lookup tables. This method compensates for chromatic dispersion by applying filters to input data signals and outputting a compensated signal.

Career Highlights

Tsutomu Tajima has worked with notable companies such as NEC Corporation and NEC Laboratories America, Inc. His experience in these organizations has allowed him to develop and refine his innovative ideas in signal processing.

Collaborations

Throughout his career, Tajima has collaborated with esteemed colleagues, including Philip N Ji and Ting Wang. These partnerships have contributed to the advancement of his research and inventions.

Conclusion

Tsutomu Tajima's contributions to signal processing technologies have established him as a key figure in the field. His innovative patents and collaborations continue to influence advancements in communication systems.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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