Method and system for indicating an optical transmit amplifier f

Details Method and system for indicating an optical transmit amplifier f Method and system for indicating an optical transmit amplifier f

1993-12-02

1996-09-17

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

359110, 250214A, 250214LA, 25022721, G08B 2100

Patent

active

055572650

ABSTRACT:
Optical transmit amplifier (24) fault indicator system (46), (78), and (80) indicates the failure of optical transmit amplifier (24) and includes an input loss circuit (46), an output failure circuit (80), and a modulation detector circuit (78). The modulation detector circuit (78) receives a portion (76) of the optical output signal (74) for determining therefrom that a failure in modulation exists in optical output signal (74) of optical transmit amplifier (24). The modulation detector (78) includes a modulation conversion circuit (82) and (84) for converting modulation in the optical output signal (76) into a measurable signal having a level within a first predetermined range in the presence of modulation and a second predetermined range in the absence of modulation. The modulation detector circuit (78) converts the measurable signal to a DC signal and produces a loss of modulation alarm signal (114) in response to a loss of modulation.

REFERENCES:
patent: 4257033 (1981-03-01), Ota et al.
patent: 4994675 (1991-02-01), Levin et al.
patent: 5150243 (1992-09-01), Suzuki
patent: 5212713 (1993-05-01), Frisch
patent: 5260819 (1993-11-01), Hadjifotiou et al.
patent: 5267068 (1993-11-01), Torihata
patent: 5335104 (1994-08-01), Johnson

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