Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1989-07-20
1990-12-11
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Optical output stabilization
372 38, 372 28, H01S 313
Patent
active
049775650
ABSTRACT:
Reference signals having a predetermined frequency interval are produced in use of a wavelength tunable laser device and an optical resonator. Plural laser devices are controlled to radiate light outputs with oscillation frequency separation. The light outputs and a frequency swept light output of the wavelength tunable laser device are combined, and then converted to beat signals. The reference signals and the beat signals are compared to detect time differences of signal occurrance timings. The plural laser devices are driven with the oscillation frequency separation, such that the time differences become a predetermined value. Where a beat pulse is not produced due to a fault in at least one laser device among the plural laser devices, a dummy pulse is produced to produce signal of the time differences. The laser device of the fault may be driven with an injecting current varying in a predetermined range to produce a beat pulse.
REFERENCES:
patent: 4835782 (1989-05-01), Kaede et al.
"Part 2", National Conference Record, 1986, The Institute of Electronics and Communication Engineers of Japan, p. 2-204.
"Technical Digest", vol. III, 5th International Conference on Integrated Optics and Optical Fiber Communication; Oct. 1-4, 1985, pp. 61-64.
Electronics Letters, Apr. 9, 1987, vol. 23, No. 8, pp. 403-405.
12th European Conference on Optical Communication, Technical Digest, vol. 1, Sep. 22/25, 1986, pp. 29-32.
Jr. Leon Scott
NEC Corporation
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