Means for controlling a semiconductor device and communication s

Details Means for controlling a semiconductor device and communication s Means for controlling a semiconductor device and communication s

1985-06-28

1987-07-14

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

324158D, 455618, H04B 900

Patent

active

046808108

ABSTRACT:
The novel technique for stabilizing an electronic device, e.g., a semiconductor laser, is disclosed. The technique can advantageously be used to stabilize the bias current of such a laser at or near the lasing threshold of the device. A preferred application of thus stabilized lasers is in optical communication systems. The inventive technique comprises determination of a derivative of a variable characteristic of the device operation, e.g., the voltage across a laser, with respect to a parameter, e.g., the laser bias current. The derivative is determined by a novel method. For the particular case of laser bias stabilization, the method comprises injecting one or more nonsinusoidal ac current components into the laser, and phase-sensitivity detecting the voltage changes at the ac frequencies. The method can, in principle, be used to determine derivatives of arbitrarily high order. A circuit capable of determining the second, third and fourth derivatives of the voltage as a function of bias current is disclosed. The derivative extraction method can also be embodied in measurement apparatus, and as useful in other process control applications.

REFERENCES:
patent: 4062632 (1977-12-01), Dixon
patent: 4081670 (1978-03-01), Albanese
patent: 4101847 (1978-07-01), Albanese
patent: 4106096 (1978-08-01), Paoli
patent: 4612671 (1986-09-01), Giles
Semiconductor Devices for Optical Communication, edited by H. Kressel, Springer-Verlag, 1982, "Lightwave Transmitters" by P. W. Shumate and M. DiDomenico, pp. 182-186.
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Electronics Letters, vol. 20, No. 11, May 1984, "Transient Chirping in Single-Frequency Lasers: Lightwave Systems Consequences" by R. A. Linke, pp. 472-474.
The Bell System Technical Journal, vol. 62, No. 7, Part I, Sep. 1983, "Stabilized Biasing of Semiconductor Lasers" by R. G. Swartz and B. A. Wooley, pp. 1923-1936.
The Bell System Technical Journal, vol. 55, No. 7, Sep. 1976, "Derivative Measurements of Light-Current-Voltage Characteristics of (Al, Ga) As Double-Heterostructure Lasers" by R. W. Dixon, pp. 973-980.
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