Tunable optical source for producing a coherent optical beam wit

Details Tunable optical source for producing a coherent optical beam wit Tunable optical source for producing a coherent optical beam wit

1994-04-25

1995-02-07

Davie, James W.

Coherent light generators

Particular beam control device

Tuning

372 26, 372 46, 372 50, H01S 310

Patent

active

053881060

ABSTRACT:
A tunable laser diode comprises a first reflector, a second reflector, an optical cavity extending between the first reflector and the second reflector for establishing an optical resonance by transmitting an optical beam therethrough, and a gain region for amplifying the optical beam. The optical cavity comprises a first waveguide part connected to the first reflector and extending toward the second reflector, a second waveguide part connected to the second reflector and extending toward the first reflector, a third waveguide part connecting the first waveguide part and the second waveguide part with each other for passing a first optical beam between the first and second reflectors, and a fourth waveguide part connecting the first waveguide part and the second waveguide part for passing a second optical beam between the first and second reflectors, wherein the first waveguide part, the second waveguide part and the third waveguide part form a first optical path having a first optical path length while the first waveguide part, the second waveguide part and the fourth waveguide part form a second optical path having a second optical path length that is different from said first optical path length. In correspondence to the third and fourth waveguide parts, a refractive index modulator is provided for changing a refractive index of the third waveguide part and the fourth waveguide part relatively with each other.

REFERENCES:
patent: 4111521 (1978-09-01), Streifer et al.
patent: 5200969 (1993-04-01), Paoli
Scifres et al., "Semiconductor lasers with integrated interferometric reflectors," Applied Physics Letters, vol. 30, No. 11, Jun. 1, 1977, pp. 585-587.
Fukui et al., "Suppression of Mode Hopping Noise Caused by External Reflection in Dynamic Single Mode (DSM) Lasers," The Transactions of the IEICE, vol. E370, No. 9, Sep. 1987, pp. 857-864.
Kotaki et al., "Tunable DBR Laser with Wide Tuning Range," Electronics Letters, vol. 24, No. 8, Apr. 14, 1988, pp. 503-505.
Patent Abstract of Japan, vol. 13, No. 26 (E-706) Jan. 20, 1989 & JP-A-229796 (Fujitsu) Sep. 26, 1988.
Patent Abstracts of Japan, vol. 14, No. 248 (E-933) May 28, 1990 & JP-A-2 069983 (Toshiba) Mar. 8, 1990.
M. Schilling et al., "Widely Tunable Y-Coupled Cavity Integrated Interferometric Injection Laser," Electronics Letters, vol. 26, No. 4, 15th Feb. 1990, pp. 243-244.

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