Inventor
OGATA TAKAAKI
JP28 patents
⚠️ This page may combine multiple inventors who share the name “OGATA TAKAAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
12 patentsUS5781332AJul 14, 1998
Variable wavelength optical filter
NEC CORP59 citations96
US6218658B1Apr 17, 2001
Optical fuse
NEC CORP21 citations92
US6064514AMay 16, 2000
Optical surge preventing method and system for use with or in a rare earth doped fiber circuit
NEC CORP25 citations92
US5739934AApr 14, 1998
Wavelength division multiplexing lightwave transmission system
NEC CORP25 citations92
US6043922AMar 28, 2000
Optical receiver board, optical wavelength-tuning filter module used for optical receiver board, and actuator for optical wavelength-tuning filter module
NEC CORP52 citations91
US7123405B2Oct 17, 2006
Optical amplifying and relaying system
NEC CORP13 citations83
US5956166ASep 21, 1999
Wavelength division multiplexing optical transmission system and wavelength division multiplexing optical transmission method
NEC CORP18 citations83
US5442476AAug 15, 1995
Optical communication method
NEC CORP16 citations74
US6539153B2Mar 25, 2003
Light limiter
NEC CORP7 citations73
US6233385B1May 15, 2001
Light limiter
NEC CORP9 citations73
US6868204B2Mar 15, 2005
Optical amplifying and relaying system
NEC CORP7 citations72
US6845192B2Jan 18, 2005
Optical amplifying and relaying system
NEC CORP1 citations61
NEC LAB AMERICA INC
12 patentsUS11467061B2Oct 11, 2022
Estimating mode field distribution in optical fibers from guided acoustic wave brillouin scattering
NEC LAB AMERICA INC4 citations72
US9819530B2Nov 14, 2017
Constellation designs with non-gray bit mapping
NEC LAB AMERICA INC3 citations72
US9337923B2May 10, 2016
Optical spectral shaping for nonlinearity enhancement in high speed digital coherent optical transmissions
NEC LAB AMERICA INC1 citations52
US9077484B2Jul 7, 2015
Generation of polarization-alternated QPSK format
NEC LAB AMERICA INC0 citations52
US12395244B2Aug 19, 2025
Optical fiber exhibiting low guided acoustic Brillouin scattering (GAWBS) noise and measurement thereof
NEC LAB AMERICA INC0 citations51
US12034482B2Jul 9, 2024
Accurate measurement for guided acoustic-wave Brillouin scattering
NEC LAB AMERICA INC0 citations51
US10581216B2Mar 3, 2020
3D waveguide for efficient coupling of multimode pump and signals to a multicore fiber amplifier
NEC LAB AMERICA INC0 citations51
US10401564B2Sep 3, 2019
Fiber nonlinearity mitigation using strong mode coupling and large modal delay
NEC LAB AMERICA INC0 citations51
US9722700B2Aug 1, 2017
Wavelength division multiplexing system and method including wavelength monitoring
NEC LAB AMERICA INC0 citations42
US9337868B2May 10, 2016
Iterative decoding for cascaded LDPC and TCM coding
NEC LAB AMERICA INC0 citations42
US9203519B2Dec 1, 2015
Pair-wise symbol correlated high receiver sensitivity modulation format
NEC LAB AMERICA INC0 citations42
US8917998B2Dec 23, 2014
Polarization switching for optical fiber communications
NEC LAB AMERICA INC0 citations42