Amplication of optical signals

Details Amplication of optical signals Amplication of optical signals

1989-03-02

1991-02-19

Grosland, Donnie L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455609, 455611, 330 43, G02F 100

Patent

active

049951009

ABSTRACT:
An AGC for a laser amplifier uses a control tone modulated onto the optical signals. During use the modulation on the optical signals is superimposed on the drive current for the laser. The AGC derives a control signal by detecting the modulation in the drive current, multiplying it by the drive current. The drive current for the laser is adjusted to keep the control signal constant. In a preferred embodiment a low level sensor detects when the control tone falls below a threshold level and switches the circuit to a default configuration. The default configuration provides a distress signal to indicate a fault and to identify the affected amplifier. This preferred embodiment is particularly suitable for submarine telecommunications capable which include a plurality of inaccessible amplifiers.

REFERENCES:
patent: 4499610 (1985-02-01), Miltonberger
patent: 4574249 (1986-03-01), Williams
patent: 4688268 (1987-08-01), Holland
patent: 4859015 (1989-08-01), Krinksky et al.
Patent Abstracts of Japan, vol. 11, No. 113 (E-497)[2560], 9th Apr. 1987, and JP-A-61 262 327 (Mitsubishi Electric Corp.).
Patents Abstract of Japan, vol. 8, No. 198 (E-265)[1635], 11 Sep. 1984; & JP-A-59 86 930 (Fujitsu K. K.).

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