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Proceedings Paper

Modal Noise In Single-Mode-Fiber Communication System
Author(s): F. T. Stone
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Paper Abstract

The amount of modal noise that appears in a single-mode-fiber communication system depends on the coherence properties of the laser transmitter, the length of the noise-generating fiber present in the system, and the splice losses of the connections to that piece of fiber. This paper shows that the coherence lengths of multi-mode lasers are sufficient to generate modal noise over lengths as long as several tens of meters. Nevertheless, the attenuation of the higher-order mode, even for lasers operated several tens of nm below the effective cutoff wavelength, is sufficient to reduce the modal noise to tolerable levels. From model noise experiments at 90 Mb/s, 432 Mb/s, and 1.7 Gb/s, a fiber design equation is derived that quantifies the relation between the minimum length of fiber that can be used and the maximum amount by which the effective cutoff wavelength can exceed the operating wavelength.

Paper Details

Date Published: 26 December 1984
PDF: 6 pages
Proc. SPIE 0500, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications II, (26 December 1984); doi: 10.1117/12.944571
Show Author Affiliations
F. T. Stone, AT&T Bell Laboratories (United States)

Published in SPIE Proceedings Vol. 0500:
Fiber Optics: Short-Haul and Long-Haul Measurements and Applications II
Robert L. Galawa, Editor(s)

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