Apparatus and method for laser bias and modulation control

Details Apparatus and method for laser bias and modulation control Apparatus and method for laser bias and modulation control

H - Electricity

01

S

H01S 3/10 (2006.01) H01S 5/0683 (2006.01) H05B 43/00 (2006.01) H01S 3/096 (1995.01) H01S 3/18 (1995.01) H01S 3/19 (1995.01)

Patent

CA 2129388

The apparatus (10) includes a laser driver (16) that receives low speed and high speed digital and analog input signals (12, 14), and biases and modulates the laser diode (22) accordingly. The laser driver (16) receives and responds to input from a feedback circuit (36, 38), which includes an average power control portion (36), and a modulation power control portion (38). The average power control portion (36) of the feedback circuit generally determines the DC component of the laser diode output, and compares it to a reference average. The modulation power control portion (38) of the feedback circuit generally determines the maximum and minimum peaks in the laser diode output, takes their average and compares the average to the DC component of the laser output from the average power control portion (36). The laser diode (22) is then driven by the laser driver (16) in response to the comparisons.

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