Amplification of optical signals optical control tone

Details Amplification of optical signals optical control tone Amplification of optical signals optical control tone

H - Electricity

04

B

325/1, 345/12

H04B 10/16 (2006.01) H04B 10/08 (2006.01) H04B 10/17 (2006.01)

Patent

CA 1293996

ABSTRACT AMPLIFICATION OF OPTICAL SIGNALS 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 cable which include a plurality of inaccessible amplifiers.

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