Device for driving a laser

Details Device for driving a laser Device for driving a laser

1986-11-07

1988-05-10

Davie, James W.

Coherent light generators

Particular component circuitry

Optical pumping

372 26, 372 29, 372 33, H01S 300

Patent

active

047440872

ABSTRACT:
A device for driving a laser (2) includes a quiescent-current means (3) which supplies, under control of a negative feedback current (I.sub.D) from a photodetector (9), a quiescent current (I.sub.B) to the laser in order to stabilize the laser light output at a level corresponding to a logic one value of a digital input signal (D). A modulation device (10), which comprises a converter, is responsive to the digital input signal to supply a first drive current (i.sub.M1) to modulate the laser. The modulation device supplies a second drive current (i.sub.M2), complementary to the first drive current, to a compensation device (20) which, for a logic zero signal, applies a compensation current (I.sub.C) to the quiescent current means thereby to reduce the light level.

REFERENCES:
patent: 4539686 (1985-09-01), Bosch et al.
Swartz et al., "Stabilized . . . Semiconductor Lasers"; The Bell System Technical Journal, vol. 62, No. 7, Part 1; 09/1983; pp.1923-1936.

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