Coherent light generators – Particular resonant cavity – Distributed feedback
Patent
1989-01-27
1990-03-13
Sikes, William L.
Coherent light generators
Particular resonant cavity
Distributed feedback
372 28, 372 46, 350 9615, 350 9617, H01S 308
Patent
active
049088335
ABSTRACT:
To overcome the deleterious effects of the nonuniform frequency modulation response in semiconductor lasers due to current injection in direct frequency modulation applications, it has been determined that the linewidth enhancement factor .alpha. be made as large as possible. In one embodiment, distributed feedback lasers well suited for frequency modulation lightwave communication systems are designed to have an integrated feedback element such as a corrugation grating whose effective pitch is selected to cause the Bragg wavelength and, therefore, the laser operating wavelength to be longer than the wavelength at substantially the maximum gain or gain peak in the semiconductor structure without the grating. That is, the wavelength of the grating is effectively detuned toward the longer wavelength and lower energy side of the peak of the gain profile. Such detuning increases the linewidth enhancement factor in such a way that the nonuniform frequency modulation response and its effects are minimized and, in some cases, substantially eliminated.
REFERENCES:
patent: 3760292 (1973-09-01), Kogelnik et al.
patent: 3884549 (1975-05-01), Wang et al.
patent: 4023993 (1977-05-01), Scifres et al.
patent: 4096446 (1978-06-01), Haus et al.
patent: 4618959 (1986-10-01), Mito
patent: 4648096 (1987-03-01), Akiba et al.
patent: 4665528 (1987-05-01), Chinone et al.
patent: 4701930 (1987-10-01), Akiba et al.
patent: 4719636 (1988-01-01), Yamaguchi
patent: 4751710 (1988-06-01), Yamaguchi et al.
Utaka et al.; "Room Temperature Operation of GaInAsP/InP Integrated Twin-Guide Lasers with First-Order Distributed Bragg Reflector"; Conference: Integrated and Guided-Ware Optics Technical Digest Incline Village, Nev, U.S.A. (Jan. 28-30, 1980).
C. H. Henry, IEEE J. of Quan. Elec., vol. QE-18, No. 2, Feb. 1982, pp. 259-264, "Theory of the Linewidth of Semiconductor Lasers".
K. Vahala et al., Appl. Phys. Lett., 42 (8), Apr. 15, 1983, pp. 631-633, "On the Linewidth Enhancement . . . ".
K. Kikuchi et al., Elec. Lett., vol. 24, No. 13, Jun. 23, 1988, pp. 821-822, "Measurement of Linewidth Enhancement Factor of . . . ".
S. Ogita et al., Elec. Lett., vol. 22, No. 11, May 22, 1986, pp. 580-581, "Theoretical Calculation of the Linewidth . . . ".
S. Ogita et al., Elec. Lett., vol. 23, No. 8, 1987, pp. 393-394, "Linewidth Reduction in DFB Lasers by Detuning Effect".
L. D. Westbrook et al., Elec. Lett., vol. 19, No. 25/26, 1983, pp. 1076-1077.
S. B. Alexander, J. of Lightwave Tech., vol. 7, No. 1, Jan. 1989, pp. 11-23, "Passive Equalization of Semiconductor . . . ".
S. Kobayashi et al., IEEE J. of Quan. Elec., vol. QE-18, No. 4, Apr. 1982, pp. 582-595, "Direct Frequency Modulation in . . . ".
Y. Yoshikuni et al., J. of Lightwave Tech., vol. LT-5, No. 4, Apr. 1987, pp. 516-522, "Multielectrode Distributed Feedback Laser for . . . ".
Vodhanel et al., J. of Lightwave Tech., vol. LT-5, No. 4, Apr. 1987, pp. 461-468, "FSK Heterodyne Transmission . . . ".
Emura et al., J. of Lightwave Tech., vol. LT-5, No. 4, Apr. 1987, pp. 469-477, "System Design and Long-Span Transmission . . . ".
Saioto et al., IEEE J. Quan. Elec., vol. QE-19, No. 2, 1983, pp. 180-193, "S/N and Error Rate Evaluation for an Optical . . . ".
Kikuchi et al., J. Lightwave Tech., vol. LT-2, No. 6, Dec. 1984, pp. 1024-1033, "Degradation of Bit-Error Rate in Coherent . . . ".
Chraplyvy Andrew R.
Koch Thomas L.
Tkach Robert W.
American Telephone and Telegraph Company
AT&T Bell Laboratories
Holloway B. R. R.
Ranieri Gregory C.
Sikes William L.
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