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1 January 1991 Computer-controlled two-segment DFB local oscillator laser tuning for multichannel coherent systems
Peter Thomas Johnson, Judith Hankey, Brian T. Debney
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Proceedings Volume 1372, Coherent Lightwave Communications: Fifth in a Series; (1991) https://doi.org/10.1117/12.24920
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States
Abstract
This paper demonstrates channel selection under embedded microprocessor control within an optical heterodyne receiver. The receiver is for use in a coherent multi-channel system demonstrator having ten channels occupying a total wavelength bandwidth of 0. 8 nm at 1 560nm. . The local oscillator laser in the receiver has to have a sufficiently large continuous wavelength tuning range achieved by electronic methods to ensure that all channels can be received and tuned rapidly. It is demonstrated that a twosegment DFB laser can used to achieve this. Use of computer control of the bias currents and temperature of the laser combined with the flexibility of the tuning method adopted has allowed an adaptive method of channel acquisition and lock to be built. Computer control of other features of the receiver simplifies design and allows relatively straightforward incorporation of infra-red remote control LCD display of date/time/channel information and allows laser ageing effects i. e. long-term drift of wavelength with constant operating conditions to be compensated for.
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Peter Thomas Johnson, Judith Hankey, and Brian T. Debney "Computer-controlled two-segment DFB local oscillator laser tuning for multichannel coherent systems", Proc. SPIE 1372, Coherent Lightwave Communications: Fifth in a Series, (1 January 1991); https://doi.org/10.1117/12.24920
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KEYWORDS
Computing systems
Oscillators
Receivers
Channel projecting optics
Heterodyning
LCDs
Wavelength tuning
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