Coherent light generators – Particular beam control device – Modulation
Patent
1987-05-04
1989-05-30
Sikes, William L.
Coherent light generators
Particular beam control device
Modulation
372 28, 372 29, 372 46, 372 96, 372 87, 372102, H01S 310, H01S 308
Patent
active
048357790
ABSTRACT:
There are disclosed a method and apparatus for producing laser pulses at two wavelengths alternately by switching the oscillations of a distributed feedback semiconductor laser of the continuous grating type back and forth across the stop band. The necessary shaping of the gain or index of refraction characteristic along the path of the oscillations is accomplished in part by two top electrodes, one of which is longer than the other along that path, and by varying the current supplied to at least one of those electrodes in the appropriate sense. Applications for optical communication and for optical logic are disclosed, the preferred embodiment being a transmitter for an optical communication system with minimal chirp of the optical pulses, in which pulses at one of the wavelengths are modulated at a bit rate exceeding 1 Gigabit by direct-modulation control of the switching of the laser, and the pulses at the other of the two wavelengths are discarded.
REFERENCES:
patent: 4243951 (1981-01-01), Wolkstein et al.
IEEE Journal of Quantum Electronics, QE-21 (1985), pp. 1880-1886, "Verification of the Light Phase Effect at the Facet on DFB Laser Properties", T. Matsuoka et al.
Electronics Letters, vol. 22, No. 22, Oct. 23, 1986, pp. 1153-1154, "Broad Wavelength Tuning Under Single--Mode Oscillation with a Multi--Electrode Distributed Feedback Laser", Y. Yoshikuni et al.
10th IEEE International Semiconductor Laser Conference, Kanazawa, Japan, Oct. 1986, pp. 64-65, "Improvement of Single Longitudinal Mode Stability by Gain Profile Control in DFB LD", by M. Yamaguchi et al.
American Telephone and Telegraph Company AT&T Bell Laboratories
Epps Georgia Y.
Sikes William L.
Wisner Wilford L.
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