Supervisory circuit for optical repeater

Details Supervisory circuit for optical repeater Supervisory circuit for optical repeater

1990-12-17

1993-02-02

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1008

Patent

active

051842424

ABSTRACT:
A supervisory circuit for optical repeaters has a selective decoder circuit for selecting and decoding either one of control signals for monitoring which are separated from individual transmission signals being propagated over the first channel and the second channel. When noise ascribable to a fault occurs on the first channel, a signal path connecting to the selective decoder circuit for inputting a control signal from the first channel is interrupted. Noise of this kind is detected in terms of an input signal level which does not lie in the frequency band of control signals.

REFERENCES:
patent: 4887309 (1989-12-01), Andersson
patent: 4973953 (1990-11-01), Shimokawa
C. D. Anderson et al, "The SL Supervisory System", IEEE Journal on selected areas in communications, vol. SAC-2, No. 6, Nov. 1984, pp. 1031-1037.

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