Peak optical power control circuit for laser driver

Details Peak optical power control circuit for laser driver Peak optical power control circuit for laser driver

H - Electricity

01

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315/24

H01S 3/13 (2006.01) H01S 5/024 (2006.01) H01S 5/0683 (2006.01) H01S 5/068 (2006.01)

Patent

CA 1236514

PEAK OPTICAL POWER CONTROL CIRCUIT FOR LASER DRIVER Abstract of the Disclosure To compensate for variations in a laser's peak power output due to changes in slope efficiency, a feedback loop is provided to monitor light output and effect compensatory changes in the drive current. In the feedback loop, the light output is detected by a photodiode. The output of the photodiode is filtered by a bandpass filter. The mean power of the filtered signal is determined and compared with a reference to control the laser drive. The reference takes account of the relationship between the filtered signal power and the peak power in the frequency spectrum of the pseudo-random input signal. The use of this reduced-bandwidth signal allows a relatively cheap, low bandwidth photodiode to be used with a long-wavelength laser. - i -

474043

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