Optical transmission system in which no arrival of a first light

Details Optical transmission system in which no arrival of a first light Optical transmission system in which no arrival of a first light

1996-07-25

1999-08-24

Hofsass, Jeffery A.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359160, 370243, H04B 1008

Patent

active

059431466

ABSTRACT:
In an optical transmission system including a plurality of stations, each of the stations includes a monitor/control circuit and a light signal output circuit. When the monitor/control circuit detects no arrival of a first light signal from the upstream-side station due to cutting of an optical cable or the like, a second light signal multiplexed with an alarm light signal of a predetermined wavelength is sent to the upstream-side station. The upstream-side station separates in wavelength the received multiplexed light signal so as to extract the alarm light signal therefrom and interrupts an optical output of the light signal output circuit toward the downstream-side station, i.e. a sender of the alarm light signal.

REFERENCES:
patent: 4025737 (1977-05-01), Brewer
patent: 5150243 (1992-09-01), Suzuki
patent: 5296956 (1994-03-01), Fatehi et al.
patent: 5436750 (1995-07-01), Kawano
patent: 5491572 (1996-02-01), Ohara
patent: 5724149 (1998-03-01), Stallard et al.
patent: 5757526 (1998-05-01), Shiragaki et al.

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