Method and device for automatic frequency control of semiconduct

Details Method and device for automatic frequency control of semiconduct Method and device for automatic frequency control of semiconduct

1989-03-24

1990-04-17

Sikes, William L.

Coherent light generators

Particular beam control device

Optical output stabilization

372 38, 372 26, 372 29, 372 28, H01S 313, H01S 300

Patent

active

049187007

ABSTRACT:
In a method for the automatic frequency control of semiconductor kasers, the signal emitted from the laser (1) is sent to an optical resonator (6) whose resonance frequency is modulated by a ramp signal, the signal outgoing from the resonator (6) is converted into an electrical signal, the derivative of such an electrical signal is calculated, the zero crossing of the derivative is detected, the ramp signal is sampled in corresponding with such a zero crossing, and the sample thus obtained is algebraically summed to a reference signal depenent on the nominal laser emission frequency, thus obtaining an error signal which is sent to devices (3) driving the laser (1). In case of a plurality of lasers (1a . . . 1n) the signals of which are wavelength multiplexed, the rame signal is sampled in correspondence with the derivative zero crossings corresponding with the emission frequencies of the individual lasers (1a . . 1n), and the samples thus obtained are compared with respective reference signals, obtaining a control signal for each laser.
A device for implementing the method is also supplied (FIG. 1).

REFERENCES:
patent: 4583228 (1986-04-01), Brown et al.
patent: 4709417 (1987-11-01), Kuwabara
patent: 4827116 (1989-05-01), Takagi et al.

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