Inventor
TAKARA HIDEHIKO
US32 patents
⚠️ This page may combine multiple inventors who share the name “TAKARA HIDEHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON TELEGRAPH & TELEPHONE
21 patentsUS5999548ADec 7, 1999
White optical pulse source and applications
NIPPON TELEGRAPH & TELEPHONE113 citations97
US5646774AJul 8, 1997
Mode-locked laser stabilizing method and apparatus
NIPPON TELEGRAPH & TELEPHONE65 citations96
US6023360AFeb 8, 2000
Multiple-channel all-optical TDM-WDM converter and multiple-channel all-optical TDM demultiplexer
NIPPON TELEGRAPH & TELEPHONE74 citations95
US5267256ANov 30, 1993
Wavelength division multiplex type mode - lock laser device
NIPPON TELEGRAPH & TELEPHONE78 citations95
US6396601B1May 28, 2002
System for monitoring quality of optical signals having different bit rates
NIPPON TELEGRAPH & TELEPHONE42 citations92
US5590143ADec 31, 1996
Multiple-frequency-modulation type mode-locked laser device
NIPPON TELEGRAPH & TELEPHONE23 citations92
US6587242B1Jul 1, 2003
Optical transmission system
NIPPON TELEGRAPH & TELEPHONE48 citations90
US7200328B2Apr 3, 2007
Method and system for determining origin of optical signal quality degradation
NIPPON TELEGRAPH & TELEPHONE12 citations83
US7668459B2Feb 23, 2010
Dispersion monitoring method and apparatus and dispersion slope temperature dependency compensation method and apparatus
NIPPON TELEGRAPH & TELEPHONE7 citations73
US7190752B2Mar 13, 2007
Data signal quality evaluation method and apparatus using high speed sampling
NIPPON TELEGRAPH & TELEPHONE7 citations73
US10615868B2Apr 7, 2020
Communication system and fault detection method
NIPPON TELEGRAPH & TELEPHONE4 citations72
US10511381B2Dec 17, 2019
Communication system and fault location specifying method
NIPPON TELEGRAPH & TELEPHONE4 citations72
US7684697B2Mar 23, 2010
Optical signal quality monitoring circuit and optical signal quality monitoring method
NIPPON TELEGRAPH & TELEPHONE6 citations63
US10527781B2Jan 7, 2020
Communication system and connector
NIPPON TELEGRAPH & TELEPHONE1 citations62
US7151897B2Dec 19, 2006
Optical clock phase-locked loop circuit
NIPPON TELEGRAPH & TELEPHONE2 citations62
US7079765B2Jul 18, 2006
Optical wavelength division multiplex signal monitoring apparatus
NIPPON TELEGRAPH & TELEPHONE4 citations62
US7024122B2Apr 4, 2006
Ultrahigh-speed clock extraction circuit
NIPPON TELEGRAPH & TELEPHONE6 citations62
US6842565B2Jan 11, 2005
Optical modulation/multiplexing circuit
NIPPON TELEGRAPH & TELEPHONE2 citations62
US11108208B2Aug 31, 2021
Optical amplification system and optical amplification method
NIPPON TELEGRAPH & TELEPHONE0 citations51
US9762982B2Sep 12, 2017
Multi-flow optical transceiver, multi-flow optical transponder and multi-flow optical node
NIPPON TELEGRAPH & TELEPHONE0 citations50
US10686520B2Jun 16, 2020
Transmission quality estimation system, transmission quality estimation device, and transmission quality estimation method
NIPPON TELEGRAPH & TELEPHONE0 citations41
ANRITSU CORP
4 patentsUS6154309ANov 28, 2000
Complementary optical sampling waveform measuring apparatus and polarization beam splitter which can be assembled therein
ANRITSU CORP38 citations92
US5995228ANov 30, 1999
Wavelength dispersion measuring apparatus and polarization dispersion measuring apparatus
ANRITSU CORP33 citations92
US6720548B2Apr 13, 2004
Optical sampling waveform measuring apparatus aiming at achieving wider band
ANRITSU CORP6 citations62
US6697395B2Feb 24, 2004
Sum frequency light generation method and sum frequency light generation apparatus adapatble for wide-band wavelength conversion
ANRITSU CORP0 citations41