Inventor
KITAJIMA SHIGEKI
JP23 patents
⚠️ This page may combine multiple inventors who share the name “KITAJIMA SHIGEKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
22 patentsUS5515196AMay 7, 1996
Optical intensity and phase modulators in an optical transmitter apparatus
HITACHI LTD158 citations98
US5323258AJun 21, 1994
Homodyne optical receiver equipment
HITACHI LTD84 citations96
US5305134AApr 19, 1994
Optical frequency division multiplexing transmitter and optical frequency division multiplexing transmission apparatus
HITACHI LTD57 citations96
US6933852B2Aug 23, 2005
Optical switching apparatus and optical communication network system
HITACHI LTD18 citations92
US6424445B1Jul 23, 2002
Optical transmission apparatus and optical systems
HITACHI LTD26 citations92
US6362905B1Mar 26, 2002
Optical crossconnect apparatus and optical transmission system
HITACHI LTD36 citations92
US5144467ASep 1, 1992
Optical tuning method and apparatus suitable for selective reception of optical frequency division multiplex signals
HITACHI LTD26 citations92
US6304346B1Oct 16, 2001
Fault restoration control method and it's apparatus in a communication network
HITACHI LTD18 citations84
US5815502ASep 29, 1998
Information transmission system with variable transmission rate
HITACHI LTD16 citations82
US5515368AMay 7, 1996
Information transmission system with variable transmission rate
HITACHI LTD16 citations82
US6731874B2May 4, 2004
Optical transmission apparatus and optical systems
HITACHI LTD6 citations74
US5761352AJun 2, 1998
Optical switch having a two-level crossing between input/output optical waveguides
HITACHI LTD13 citations74
US6839480B2Jan 4, 2005
Optical switching apparatus, optical transmission system and method of setting up for optical signal route
HITACHI LTD6 citations73
US6813445B2Nov 2, 2004
Optical crossconnect apparatus and optical transmission system
HITACHI LTD6 citations73
US6778725B1Aug 17, 2004
Optical switching apparatus, optical transmission system and method of setting up for optical signal route
HITACHI LTD9 citations73
US6317230B1Nov 13, 2001
Optical cross-connect system and optical transmission system
HITACHI LTD14 citations73
US5576872ANov 19, 1996
Optical distribution device, optical distribution circuit, and synthesizing method of distribution circuits
HITACHI LTD6 citations70
US7356257B2Apr 8, 2008
Optical switching apparatus and optical communication network system
HITACHI LTD4 citations62
US7206475B2Apr 17, 2007
Optical switching apparatus, optical transmission system and method of setting up for optical signal route
HITACHI LTD2 citations62
US5790290AAug 4, 1998
Optical distribution system having time switch
HITACHI LTD2 citations59
US7272314B2Sep 18, 2007
Optical crossconnect apparatus and optical transmission system
HITACHI LTD0 citations52
US7194205B2Mar 20, 2007
Optical transmission apparatus and optical systems
HITACHI LTD0 citations52