Coherent light generators – Particular beam control device – Tuning
Patent
1989-05-04
1990-04-10
Davie, James W.
Coherent light generators
Particular beam control device
Tuning
372 26, 372 32, H01S 310
Patent
active
049167057
ABSTRACT:
A selectively tunable coherent optical receiver includes a tunable laser for producing a selectable local oscillator frequency for receiving any one of a group of received optical channel signals. The tunable laser is controlled by a feedback loop and a digital processor that stores values of laser bias current. The arrangement produces an exact local oscillator frequency for operating with any one of the group of selectable received channel signals which are spaced over a range of optical carrier frequencies. This receiver avoids frequency sticking and very long pull-in time and determines when there is a missing channel or missing channels.
REFERENCES:
patent: 4719636 (1988-01-01), Yamaguchi
patent: 4806873 (1989-02-01), Nagano
patent: 4829527 (1987-05-01), Wortman et al.
patent: 4829535 (1989-05-01), Utaka
Y. Kotaki et al., 1.55 .mu.m Wavelength Tunable FBH-DBR Laser, Electronics Letters, Mar. 26, 1987, vol. 23, No. 7, pp. 325-327.
S. Murata et al., Over 720 GHz (5.8 nm) Frequency Tuning by a 1.5 .mu.m DBR Laser with Phase and Bragg Wavelength Control Regions, Electronics Letters, Apr. 9, 1987, vol. 23, No. 8, pp. 403-405.
T. L. Koch et al., Continuously Tunable 1.5 .mu.m Multiple-Quantum-Well GaInAs/GaInAsP Distributed-Bragg-Reflector Lasers, Electronics Letters, Nov. 10, 1988, vol. 24, No. 23, pp. 1431-1433.
B. S. Glance et al., Densely Spaced FDM Coherent Star Network with Optical Signals Confined to Equally Spaced Frequencies, Jnl. Lightwave Tech., vol. 6, No. 11, Nov. 1988, pp. 1770-1781.
B. Glance et al., Frequency Stabilisation of FDM Optical Signals Originating from Different Locations, Electronic Letters, Nov. 5, 1987, vol. 23, No. 23, pp. 1243-1245.
B. Glance et al., Frequency Stabilisation of FDM Optical Signals, Electronic Letters, Jul. 2, 1987, vol. 23, No. 14, pp. 750-752.
AT&T Bell Laboratories
Davie James W.
Havill Richard B.
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