H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/155 (2006.01) H01S 5/0683 (2006.01)
Patent
CA 1151733
ABSTRACT An injection laser diode transmitter contains a detector arrangement that permits the quality of the signal transmitted over a fiber optic link of interest to be monitored for degradation and error detection, by examining the transmitted optical pulses. The transmitted signal component is extracted from the back facet of the ILD for feedback stability control purposes and is coupled to signal quality measuring circuitry from a wideband current-to-voltage converter that is coupled to the output of a fast photo diode that extracts the optical output signal from the rear facet of the ILD for the purposes of generating a feedback control voltage to be used for ILD bias control. The bias current generated through a feedback loop from the fast photo diode to the wideband current-to-voltage converter feeds reference amplifier, the output of which is coupled to a lowpass filter to remove the pulse signal component. The output of the low pass filter is a DC voltage level which is directly proportional to the average optical output of the ILD. The voltage level output of the lowpass filter is applied to a current sink coupled to the ILD. The bias current for the ILD is controlled to drive the differential to zero. Because the bias current control feedback loop is responsive to the optical output of the ILD, the bias current is automatically compensated for changes in temperature. The current-voltage converter output is further coupled to a buffer amplifier to supply an output voltage to downlink signal quality monitoring circuitry. In a repeatered, multichannel fiber optic communication system, this quality-indication signal availability facilitates a fault isolation scheme wherein the transmitter outputs are examined selectively.
374944
Ashley William B.
Casper Paul W.
Harris Corporation
Pascal & Associates
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