US Patent No: 5,327,275

Number of patents in Portfolio can not be more than 2000

Switching system of optical transmission lines for protecting from trouble

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Abstract

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A system for optical communication between first and second optical terminal stations, containing a plurality of working optical transmission lines each for connecting between the first and second optical terminal stations, a protection optical transmission line. Each of the first and second optical terminal stations contains a plurality of working pieces of optical terminal equipment, connected to the respective working optical transmission lines, a protection piece of optical terminal equipment connected to the protection optical transmission line, and a plurality of bidirectional optical signal paths, provided corresponding to the respective working pieces of optical terminal equipment, and each operative to connect the corresponding working piece of optical terminal equipment to the protection piece of optical terminal equipment.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
FUJITSU LIMITEDKAWASAKI24374

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujimoto, Naonobu Kawasaki, JP 10 265
Fukushima, Takeo Tokyo, JP 19 276
Iino, Hatsumi Kawasaki, JP 6 139
Kihara, Takashi Chiba, JP 68 258
Nishimura, Koichi Susono, JP 190 3413190
Yamane, Kazuo Kawasaki, JP 57 550

Cited Art Landscape

Patent Info (Count) # Cites Year
 
FUJITSU LIMITED (2)
4,680,776 Protection switching system for carrier transmission line 50 1984
4,967,406 Subsignal transmitting system 11 1989
 
ALCATEL NETWORK SYSTEMS, INC. (1)
4,393,493 Automatic protection apparatus for span lines employed in high speed digital systems 78 1980
 
ERICSSON AB (1)
5,069,521 Optical transmission apparatus 79 1990
 
HARRIS CORPORATION (1)
4,451,916 Repeatered, multi-channel fiber optic communication network having fault isolation system 189 1980
 
HITACHI, LTD. (1)
5,175,639 Optical subscriber network transmission system 15 1990
 
NORTEL NETWORKS LIMITED (1)
4,646,286 Communications system with protection switching and channel identities 24 1985
 
Tokyo Shibaura Denki Kabushiki Kaisha (1)
4,347,605 Multiplexed telecommunication systems 14 1980
 
TTI INVENTIONS A LLC (1)
5,007,070 Service clock recovery circuit 42 1989

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
HITACHI, LTD. (11)
5,555,477 Optical transmission system constructing method and system 32 1993
5,739,932 Optical transmission system constructing method and system 3 1996
5,812,289 Optical repeater and optical transmitter 14 1996
5,875,046 Optical repeater and optical transmitter 6 1996
5,861,972 Optical multiplex transmission equipment and method 3 1996
6,005,699 Optical wavelength multiplexing system 9 1997
6,018,405 Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal 5 1999
6,266,169 Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal 14 1999
6,728,489 Optical transmission system constructing method and system 4 2001
7,167,652 Optical transmission system constructing method and system 0 2004
7,292,785 Optical transmission system constructing method and system 0 2006
 
FUJITSU LIMITED (7)
5,457,555 Optical transmission system 19 1993
5,510,925 Relay transmission system including optical amplification 7 1994
5,434,691 Communications system having optical transmission line switching system 21 1994
6,147,783 Optical transmission system wherein protection terminal equipment converts alarm indication signal before relaying same to working terminal equipment 0 1995
5,949,563 Wavelength division multiplexing transmitter receiver, optical transmission system, and redundant system switching method 20 1997
7,418,203 Diagnosis method for standby system of optical ring network 1 2004
7,764,881 Optical apparatus and optical cross connect apparatus 8 2005
 
NEC CORPORATION (2)
6,317,414 Signal switching method 21 1998
7,613,391 Optical signal switching device for use in an optical protection network 1 2003
 
SN AQUISITION CORP. (2)
6,321,004 Protection switching in bidirectional WDM optical communication networks 12 2001
6,307,986 Protection switching in bidirectional WDM optical communication networks with transponders 19 2001
 
CIENA CORPORATION (1)
7,158,477 Data communication apparatus with distributed traffic protection switching system 4 2002
 
CORNING INCORPORATED (1)
6,323,974 Optical protection system for liquid crystal switches 9 2000
 
ERICSSON AB (1)
7,136,586 Optical communication system 2 2001
 
ITALTEL S.P.A. (1)
5,680,546 Passive optical network structure with high fault tolerance 16 1994
 
KABUSHIKI KAISHA TOSHIBA (1)
7,310,683 Message relaying scheme based on switching in units of flows 10 2003
 
LIGHTECH FIBEROPTICS, INC. (1)
7,532,817 Fiber optic link protection apparatus 3 2004
 
LUCENT TECHNOLOGIES INC. (1)
5,594,581 Low loss optical transmission/monitoring path selection in redundant equipment terminals 9 1995
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (1)
5,440,538 Communication system with redundant links and data bit time multiplexing 81 1993
 
MOTOROLA MOBILITY LLC (1)
8,611,740 System and method for protecting an extended passive optical network 0 2009
 
NEC ELUMINANT TECHNOLOGIES, INC. (1)
6,513,092 1:N protection switching architecture for common processing units 22 2000
 
NEC INFRONTIA CORPORATION (1)
8,625,629 Transmission/reception system and transmission/reception method 0 2011
 
ROGERS COMMUNICATIONS INC. (1)
7,630,597 Master/slave multiple path optical switching device 0 2006
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,790,286 Technique for embodying duplication of optical paths in optical data transmission 13 1996
 
SHARP KABUSHIKI KAISHA (1)
5,610,749 Microcomputer control optical fiber transmission system 4 1995
 
TELLABS OPERATIONS, INC. (1)
8,018,838 Apparatus and method for protection switching in a network 1 2003
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (1)
6,288,813 Apparatus and method for effecting data transfer between data systems 44 1998
 
VERIZON PATENT AND LICENSING INC. (1)
6,061,482 Channel layered optical cross-connect restoration system 19 1997