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Proceedings Paper

Comparison of alternative modulation techniques for microwave optical links
Author(s): Dumrong Kasemset; Edward I. Ackerman; Stephen Wanuga; Peter R. Herczfeld; Afshin S. Daryoush
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Paper Abstract

Directly- and externally-modulated fiber optic links have been compared in terms of gain, noise, and dynamic range. Data obtained indicate that direct modulation has gain and noise figures relatively insensitive to the optical bias level, provided the increased dynamic range at the higher laser bias level; excess optical noise caused by relaxation oscillation in the semiconductor laser limited the noise figure and dynamic range. For the externally-modulated link, gain and noise figures appeared to significantly depend on the optical input power and RF switching power, but the dynamic range is primarily determined by the optical input power. Photodetector linearity is a significant factor limiting the dynamic range of both of these links, especially at lower microwave frequencies.

Paper Details

Date Published: 1 February 1991
PDF: 11 pages
Proc. SPIE 1371, High-Frequency Analog Fiber Optic Systems, (1 February 1991); doi: 10.1117/12.24901
Show Author Affiliations
Dumrong Kasemset, General Electric Co. (United States)
Edward I. Ackerman, General Electric Co. (United States)
Stephen Wanuga, General Electric Co. (United States)
Peter R. Herczfeld, Drexel Univ. (United States)
Afshin S. Daryoush, Drexel Univ. (United States)

Published in SPIE Proceedings Vol. 1371:
High-Frequency Analog Fiber Optic Systems
Paul Sierak, Editor(s)

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