Switching system of optical transmission lines for protecting from trouble

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5327275
SERIAL NO

07784211

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ATTORNEY / AGENT: (SPONSORED)

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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 LIMITEDKAWASAKI17740

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujimoto, Naonobu Kawasaki, JP 10 274
Fukushima, Takeo Kawasaki, JP 18 292
Iino, Hatsumi Kawasaki, JP 6 147
Kihara, Takashi Kawasaki, JP 48 318
Nishimura, Koichi Kawasaki, JP 138 868
Yamane, Kazuo Kawasaki, JP 46 605

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ALCATEL NETWORK SYSTEMS, INC. (1)
* 4393493 Automatic protection apparatus for span lines employed in high speed digital systems 79 1980
 
TTI INVENTIONS A LLC (1)
* 5007070 Service clock recovery circuit 42 1989
 
ERICSSON AB (1)
* 5069521 Optical transmission apparatus 80 1990
 
Tokyo Shibaura Denki Kabushiki Kaisha (1)
* 4347605 Multiplexed telecommunication systems 14 1980
 
HARRIS CORPORATION (1)
* 4451916 Repeatered, multi-channel fiber optic communication network having fault isolation system 208 1980
 
FUJITSU LIMITED (2)
* 4680776 Protection switching system for carrier transmission line 50 1984
* 4967406 Subsignal transmitting system 11 1989
 
HITACHI, LTD. (1)
* 5175639 Optical subscriber network transmission system 15 1990
 
NORTEL NETWORKS LIMITED (1)
* 4646286 Communications system with protection switching and channel identities 24 1985
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
SHARP KABUSHIKI KAISHA (1)
* 5610749 Microcomputer control optical fiber transmission system 4 1995
 
VERIZON PATENT AND LICENSING INC. (1)
* 6061482 Channel layered optical cross-connect restoration system 20 1997
 
NEC PLATFORMS, LTD. (2)
* 8625629 Transmission/reception system and transmission/reception method 0 2011
* 2013/0010,806 TRANSMISSION/RECEPTION SYSTEM AND TRANSMISSION / RECEPTION METHOD 0 2011
 
ERICSSON AB (2)
* 7136586 Optical communication system 2 2001
* 2001/0040,710 Optical communication system 3 2001
 
LUCENT TECHNOLOGIES INC. (1)
* 5594581 Low loss optical transmission/monitoring path selection in redundant equipment terminals 10 1995
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (1)
* 6288813 Apparatus and method for effecting data transfer between data systems 47 1998
 
CIENA CORPORATION (2)
* 7158477 Data communication apparatus with distributed traffic protection switching system 4 2002
* 2003/0120,755 Data communication apparatus with distributed traffic protection switching system 0 2002
 
SAMSUNG ELECTRONICS CO., LTD. (1)
* 5790286 Technique for embodying duplication of optical paths in optical data transmission 13 1996
 
FUJITSU LIMITED (10)
* 5457555 Optical transmission system 19 1993
* 5510925 Relay transmission system including optical amplification 7 1994
* 5434691 Communications system having optical transmission line switching system 22 1994
* 6147783 Optical transmission system wherein protection terminal equipment converts alarm indication signal before relaying same to working terminal equipment 0 1995
* 5949563 Wavelength division multiplexing transmitter receiver, optical transmission system, and redundant system switching method 22 1997
* 7418203 Diagnosis method for standby system of optical ring network 1 2004
* 2005/0169,629 Diagnosis method for standby system of optical ring network 0 2004
* 7764881 Optical apparatus and optical cross connect apparatus 11 2005
* 2006/0210,266 Optical apparatus and optical cross connect apparatus 10 2005
* 9287969 Protection channel provisioning method and node equipment 0 2014
 
HITACHI, LTD. (12)
* 5555477 Optical transmission system constructing method and system 32 1993
* 5739932 Optical transmission system constructing method and system 3 1996
* 5812289 Optical repeater and optical transmitter 14 1996
* 5875046 Optical repeater and optical transmitter 6 1996
* 5861972 Optical multiplex transmission equipment and method 4 1996
* 6005699 Optical wavelength multiplexing system 11 1997
* 6018405 Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal 5 1999
6266169 Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal 14 1999
6728489 Optical transmission system constructing method and system 4 2001
7167652 Optical transmission system constructing method and system 1 2004
* 2004/0161,189 Optical transmission system constructing method and system 0 2004
7292785 Optical transmission system constructing method and system 1 2006
 
CORNING INCORPORATED (1)
* 6323974 Optical protection system for liquid crystal switches 10 2000
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (1)
* 5440538 Communication system with redundant links and data bit time multiplexing 85 1993
 
NEC CORPORATION (3)
* 6317414 Signal switching method 21 1998
* 7613391 Optical signal switching device for use in an optical protection network 4 2003
* 2004/0017,967 Communication node and switching device 3 2003
 
SN AQUISITION CORP. (2)
6321004 Protection switching in bidirectional WDM optical communication networks 12 2001
6307986 Protection switching in bidirectional WDM optical communication networks with transponders 21 2001
 
LIGHTECH FIBEROPTICS, INC. (1)
7532817 Fiber optic link protection apparatus 3 2004
 
KABUSHIKI KAISHA TOSHIBA (1)
* 7310683 Message relaying scheme based on switching in units of flows 11 2003
 
ITALTEL S.P.A. (1)
* 5680546 Passive optical network structure with high fault tolerance 16 1994
 
GOOGLE INC. (2)
* 8611740 System and method for protecting an extended passive optical network 2 2009
* 2009/0214,222 SYSTEM AND METHOD FOR PROTECTING AN EXTENDED PASSIVE OPTICAL NETWORK 5 2009
 
TELLABS OPERATIONS, INC. (2)
* 8018838 Apparatus and method for protection switching in a network 1 2003
* 2004/0085,895 Apparatus and method for protection switching 10 2003
 
ROGERS COMMUNICATIONS INC. (2)
* 7630597 Master/slave multiple path optical switching device 0 2006
* 2007/0280,696 Master/slave multiple path optical switching device 1 2006
 
NEC ELUMINANT TECHNOLOGIES, INC. (1)
6513092 1:N protection switching architecture for common processing units 24 2000
* Cited By Examiner