Electro-optical modulator which provides optical bias stabilizat

Details Electro-optical modulator which provides optical bias stabilizat Electro-optical modulator which provides optical bias stabilizat

1992-03-31

1994-03-08

Chilcot, Jr., Richard E.

Optical: systems and elements

Prism

With reflecting surface

359181, 359187, 359194, 372 29, 372 31, 372 38, H04B 1004, H04B 1006

Patent

active

052932630

ABSTRACT:
An optical transmitter comprising a control loop for stabilizing the bias current which sets a bias level of the amount of light emitted by a laser diode 6. A cascade circuit 5 which includes the laser diode 6, a photodiode 7 and a variable gain control amplifier 8 is connected in the negative feedback path of the control loop. To prevent amplitude modulation of the bias current when a modulation signal occurs at the input of the gain control amplifier, the control loop produces a cancelling signal of a magnitude which cancels the mean value of such modulation signal. The cancelling signal is derived from the modulation signal in a fixed manner, by fixing the transfer factor of the negative feedback path as measured by transmission of an auxiliary signal through such path and adjusting the gain of amplifier 8 in accordance with the result of such measurements.

REFERENCES:
patent: 4504976 (1985-03-01), Beaudet
patent: 4884280 (1989-11-01), Kinoshita
patent: 5018155 (1991-03-01), Miyairi
patent: 5127015 (1992-06-01), Chikugawa et al.
12th European Conference On Optical Communication, ECOC 1986, Technical Digest vol. 1, Sep. 22-25, 1986, Barcelona, Spain, pp. 321-324.

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