Title:
OPTICAL TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/1993/014574
Kind Code:
A1
Abstract:
In an optical transmission system, on both transmitting and receiving sides, provided are respectively an auxiliary transmitter and a plurality of live transmitters. By connecting the main optical transmitting/receiving circuits of the auxiliary and live transmitters to an optical transmission line, transmitted are optical signals between the transmitting and receiving sides. In the optical transmission system, provided are an additional optical transmission line and control means. Via the additional optical transmission line, optical signals, produced by combining the outputs of optical transmitting sub-circuits of the live transmitters on the transmitting and receiving sides, are fed to optical receiving sub-circuits of the auxiliary transmitters. Also, via the additional transmission line, the optical signals outputted from optical transmitting sub-circuits of the auxiliary transmitters on both transmitting and receiving sides, are fed to the optical receiving sub-circuits of the live transmitters. In normal transmission by the live transmitters, the control means operates one of the optical receiving sub-circuits of the live transmitters. The control means selects one of the optical transmitting sub-circuits of live transmitters and operates the selected one in succession. However, if the selected sub-circuit of the live transmitters has a failure, the control means does not operate it and selects another optical transmitting sub-circuit. Also, the auxiliary transmitters detect the circuit quality between the auxiliary transmitters and the live transmitters.
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Inventors:
MORIYAMA JUNICHI (JP)
Application Number:
PCT/JP1993/000013
Publication Date:
July 22, 1993
Filing Date:
January 08, 1993
Export Citation:
Assignee:
FUJITSU LTD (JP)
International Classes:
G06F11/20; H04B1/74; H04B10/032; H04L1/22; (IPC1-7): H04B1/74
Foreign References:
| JPH01286645A | 1989-11-17 | |||
| JPS6216640A | 1987-01-24 | |||
| JPS5274211A | 1977-06-22 |
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