Apparatus for servo-controlling the bias voltage of a light sour

Details Apparatus for servo-controlling the bias voltage of a light sour Apparatus for servo-controlling the bias voltage of a light sour

1994-06-28

1995-08-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359187, 372 33, H01S 310

Patent

active

054401135

ABSTRACT:
A particular embodiment comprises:
a semiconductor laser;
a Mach-Zehnder type modulator;
an analog adder for adding a modulation signal representing binary data with a DC bias voltage;
a coupler for taking off a fraction of the modulated light signal;
a photodiode;
an amplifier;
a bandpass filter tuned to a frequency equal to the binary data transmission rate;
an amplifier;
an amplitude detector;
an amplifier; and
a microprocessor associated with an analog-to-digital converter and with a digital-to-analog converter to modify the bias voltage so as to cause the amplitude of the spectrum line extracted by the filter and the amplitude detector to remain below a fixed threshold value. The invention is applicable to digital data transmissions.

REFERENCES:
patent: 4162398 (1979-07-01), Kayanuma
patent: 4253734 (1981-03-01), Komurasaki et al.
patent: 4698817 (1987-10-01), Burley
patent: 5003624 (1991-03-01), Terbrack et al.
patent: 5208817 (1993-04-01), Kao et al.
T. Kataoka et al, "Novel Automatic Bias Voltage Control for Travelling Wave Electrode Optical Modulators", Electronics Letter, vol. 27, No. 11, May 23, 1991, pp. 943-945.
French Search Report FR 9308068.

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