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Proceedings Paper

Coherent Fiber-Optic Transmission Systems: Potentials And Problems
Author(s): B Basch; G R Joyce; S Stone; R F Kearns
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Paper Abstract

Optical communication systems which use heterodyne or homodyne detection are commonly referred to as coherent systems. These systems provide a significant improvement in receiver sensitivity, leading to a substantial increase in repeater spacing. Heterodyning also allows the frequency domain multiplexing of several hundred or more optical carriers, with very narrow separation, leading to a vast improvement in capacity. However, these systems place very stringent requirements upon the coherence of the lasers used. The semiconductor lasers intended for use in these systems possess both phase and intensity noise, which limit the system performance. We give an overview of the manner and extent to which these problems degrade a coherent transmission system. The resulting requirements on laser linewidth are noted. Techniques for the linewidth reduction of semiconductor lasers, such as external grating loading and injection locking, are reviewed.

Paper Details

Date Published: 23 February 1987
PDF: 8 pages
Proc. SPIE 0716, High Frequency Optical Communications, (23 February 1987); doi: 10.1117/12.937468
Show Author Affiliations
B Basch, GTE Laboratories Incorporated (United States)
G R Joyce, GTE Laboratories Incorporated (United States)
S Stone, GTE Laboratories Incorporated (United States)
R F Kearns, GTE Laboratories Incorporated (United States)

Published in SPIE Proceedings Vol. 0716:
High Frequency Optical Communications
O. Glenn Ramer; Paul Sierak, Editor(s)

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