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Proceedings Paper

Optical equalization of polarization dispersion
Author(s): Jack H. Winters; Zygmunt Haas; Mario A. Santoro; Alan H. Gnauck
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Paper Abstract

In this paper, we describe a demonstration of the optical equalization of polarization dispersion in direct-detection lightwave systems. We use a polarization controller to adjust the polarization into a fiber to one of the principal states of polarization of the fiber, which eliminates first-order polarization dispersion. Results for a 2.5 Gbps, externally modulated system with a fiber with 120 ps rms of polarization dispersion, show that by using the equalizer we maintain a 10-9 BER, while without the technique the BER varies with time from 10-5 to 10-9. At 10 Gbps, the equalizer allows reliable bit detection even though the eye is closed without equalization, demonstrating an order of magnitude increase in the dispersion-limited B2L product, in agreement with our analytical and computer simulation results. We also describe a demonstration of the technique at the receiver, and show how to implement an adaptive polarization controller to continuously track the principal states using a gradient search algorithm. This technique provides bit-rate-independent equalization of first-order polarization dispersion.

Paper Details

Date Published: 17 December 1992
PDF: 12 pages
Proc. SPIE 1787, Multigigabit Fiber Communications, (17 December 1992); doi: 10.1117/12.139326
Show Author Affiliations
Jack H. Winters, AT&T Bell Labs. (United States)
Zygmunt Haas, AT&T Bell Labs. (United States)
Mario A. Santoro, AT&T Bell Labs. (United States)
Alan H. Gnauck, AT&T Bell Labs. (United States)


Published in SPIE Proceedings Vol. 1787:
Multigigabit Fiber Communications
Leonid G. Kazovsky; Karen Liu, Editor(s)

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