Method for controlling the operation of a laser

Details Method for controlling the operation of a laser Method for controlling the operation of a laser

1997-03-07

2000-06-20

Bovernick, Rodney B.

Coherent light generators

Particular component circuitry

Optical pumping

H01S 300

Patent

active

060786019

ABSTRACT:
A control method is provided by which a laser output can be controlled through the use of a signal provided by a photodiode that receives a reflected ratio of the laser output signal. A time varying signal is added to the low magnitude portions of an electrical data input signal to the laser. This first electrical monitoring signal, which is essentially an average output from the photodiode because of its frequency response, is then passed through a low pass filter to provide a second electrical monitoring signal. The first electrical monitoring signal is multiplied by a time varying signal to provide a third electrical monitoring signal. The time varying signal, which can be a sinusoidal waveform, is added to the low magnitude portions of an electrical input signal provided to the laser. The third electrical monitoring signal is averaged over time by a low pass filter to provide a fourth electrical monitoring signal. Therefore, by adding the time varying signal, or tone, to the electrical input signal of the laser, the output power of the laser can be controlled so that the laser is operated at an appropriate threshold magnitude and with an appropriate depth of modulation, regardless of possible temperature effects on the operating characteristics of the laser.

REFERENCES:
patent: 5033061 (1991-07-01), Hobart et al.

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