GB2189961B - Optical transmission system - Google Patents

Optical transmission system

Info

Publication number
GB2189961B
GB2189961B GB8610579A GB8610579A GB2189961B GB 2189961 B GB2189961 B GB 2189961B GB 8610579 A GB8610579 A GB 8610579A GB 8610579 A GB8610579 A GB 8610579A GB 2189961 B GB2189961 B GB 2189961B
Authority
GB
United Kingdom
Prior art keywords
frequencies
nodes
adjacent
image
transmission system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB8610579A
Other versions
GB8610579D0 (en
GB2189961A (en
Inventor
Isobel Jennifer Goddard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
STC PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STC PLC filed Critical STC PLC
Priority to GB8610579A priority Critical patent/GB2189961B/en
Publication of GB8610579D0 publication Critical patent/GB8610579D0/en
Publication of GB2189961A publication Critical patent/GB2189961A/en
Application granted granted Critical
Publication of GB2189961B publication Critical patent/GB2189961B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

An optical fibre transmission system has a large number (eg. 30) of nodes connected to an optical transmission line by passive couplers, there being at each node an incoming coupler and an outgoing coupler. If the adjacent nodes have adjacent frequencies, crosstalk is a problem. In the present system the allocation of frequencies to nodes is on a non-adjacent basis, preferably to a preset pattern. This reduces crosstalk between the channels formed by the various frequencies. In the system described the transmission line uses mono-mode optical fibre, and the frequency allocation to the nodes is as in the following table <IMAGE> and so on. When the odd-numbered frequencies have all been allocated, the even-numbered ones 2, 4, 6, 8... are used. <IMAGE>
GB8610579A 1986-04-30 1986-04-30 Optical transmission system Expired - Fee Related GB2189961B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8610579A GB2189961B (en) 1986-04-30 1986-04-30 Optical transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8610579A GB2189961B (en) 1986-04-30 1986-04-30 Optical transmission system

Publications (3)

Publication Number Publication Date
GB8610579D0 GB8610579D0 (en) 1986-06-04
GB2189961A GB2189961A (en) 1987-11-04
GB2189961B true GB2189961B (en) 1990-02-14

Family

ID=10597123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8610579A Expired - Fee Related GB2189961B (en) 1986-04-30 1986-04-30 Optical transmission system

Country Status (1)

Country Link
GB (1) GB2189961B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE41247E1 (en) 1997-04-01 2010-04-20 Lockheed Martin Corporation Optical transport system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5101290A (en) * 1990-08-02 1992-03-31 At&T Bell Laboratories High-performance packet-switched wdm ring networks with tunable lasers
JP3055603B2 (en) * 1996-07-19 2000-06-26 日本電気株式会社 Optical network
US6021233A (en) * 1998-02-12 2000-02-01 Ciena Corporation WDM ring transmission system having reduced adjacent channel cross-talk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE41247E1 (en) 1997-04-01 2010-04-20 Lockheed Martin Corporation Optical transport system

Also Published As

Publication number Publication date
GB8610579D0 (en) 1986-06-04
GB2189961A (en) 1987-11-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920430