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Proceedings Paper

Computer-controlled two-segment DFB local oscillator laser tuning for multichannel coherent systems
Author(s): Peter Thomas Johnson; Judith Hankey; Brian T. Debney
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Paper 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.

Paper Details

Date Published: 1 January 1991
PDF: 12 pages
Proc. SPIE 1372, Coherent Lightwave Communications: Fifth in a Series, (1 January 1991); doi: 10.1117/12.24920
Show Author Affiliations
Peter Thomas Johnson, Plessey Research Caswell Ltd. (United Kingdom)
Judith Hankey, Plessey Research Caswell Ltd. (United Kingdom)
Brian T. Debney, Plessey Research Caswell Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 1372:
Coherent Lightwave Communications: Fifth in a Series
Harish R. Sunak; Roger C. Steele, Editor(s)

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