Laser differential quantum efficiency control circuit

Details Laser differential quantum efficiency control circuit Laser differential quantum efficiency control circuit

H - Electricity

01

S

315/24

H01S 3/10 (2006.01) H01S 5/0683 (2006.01)

Patent

CA 1229653

LASER DIFFERENTIAL QUANTUM EFFICIENCY CONTROL CIRCUIT Abstract of the Disclosure In an injection laser drive arrangement, variations in differential quantum efficiency are compensated by means of a feedback loop which includes a low pass filter and the usual PIN diode on the rear face of the laser diode. A second low pass filter, having characteristics identical to the first, filters the input signal. The outputs of the two low pass filters are compared and integrated to provide a control signal for varying the amplitude of the signal applied to the laser diode. With this arrangement, laser output variations due to patterns of bits in the input signal are cancelled out in the control signal, which consequently compensates the differential quantum efficiency. - i -

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