Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1986-09-30
1988-03-22
Davie, James W.
Coherent light generators
Particular beam control device
Optical output stabilization
372 26, 372 38, 250205, H01S 313
Patent
active
047333987
ABSTRACT:
A drive circuit supplies a semiconductor laser with current pulses corresponding to an input pulse signal. A current supply feeds a d.c. bias current to the laser. A monitoring photodiode produces a light detection signal indicative of the actual laser output level. The detection signal is supplied to a subtraction device, to which the pulse signal is also supplied via a low-pass filter. The subtraction device detects the difference between the two signals to produce an error signal. Integration devices produce average value signals, which are compared by comparators with reference voltages to obtain control signals. The current supply and the current drive circuit are responsive to these control signals to independently modulate the d.c. bias current and the amplitude of the drive pulses applied to the laser, whereby the laser output level can be stabilized to remain at a constant level.
REFERENCES:
patent: 4450564 (1984-04-01), Meuleman et al.
patent: 4631728 (1986-12-01), Simons
patent: 4689795 (1987-08-01), Yoshimoto et al.
patent: 4692606 (1987-09-01), Sakai et al.
Kinoshita Osamu
Shibagaki Taro
Davie James W.
Kabushiki Kaisha Tohsiba
Randolph B.
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