Patent ID: 7362972
Filing Date: 2008-04-22
Classification: H04B

Abstract:
1. An optical transmitter, transponder or transceiver for sending supervisory data signals and line data signals as a composite optical signal through an optical fiber link comprising: a) means for receiving a line data signal in the form of an electrical signal having a line data bit rate; b) means for receiving a supervisory data signal in the form of an electrical signal; c) means for converting the supervisory data signal into a modulated supervisory data signal having one or more predetermined supervisory carrier frequencies and a supervisory carrier frequency amplitude; d) a driver for driving the line data signal to a laser module; e) the laser module coupled to the driver for sending as a single combined signal, the composite optical signal comprising the line data signal and the modulated supervisory data signal having a modulation index that is the ratio of an optical power associated with the supervisory data signal to an optical power associated with the line data signal; f) circuitry for receiving line data bit rate information; and, g) control circuitry for controlling the modulation index by varying the supervisory carrier frequency amplitude in dependence upon the line data bit rate.