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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 30, Iss. 14 — May. 10, 1991
  • pp: 1826–1838

Design and performance optimization of fiber optic adaptive filters

Palacharla Paparao, Anjan Ghosh, and Susan D. Allen  »View Author Affiliations


Applied Optics, Vol. 30, Issue 14, pp. 1826-1838 (1991)
http://dx.doi.org/10.1364/AO.30.001826


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Abstract

There is a great need for easy-to-fabricate and versatile fiber optic signal processing systems in which optical fibers are used for the delay and storage of wideband guided lightwave signals. We describe the design of the least-mean-square algorithm-based fiber optic adaptive filters for processing guided lightwave signals in real time. Fiber optic adaptive filters can learn to change their parameters or to process a set of characteristics of the input signal. In our realization we employ as few electronic devices as possible and use optical computation to utilize the advantages of optics in the processing speed, parallelism, and interconnection. Many schemes for optical adaptive filtering of electronic signals are available in the literature. The new optical adaptive filters described in this paper are for optical processing of guided lightwave signals, not electronic signals. We analyzed the convergence or learning characteristics of the adaptive filtering process as a function of the filter parameters and the fiber optic hardware errors. From this analysis we found that the effects of the optical round-off errors and noise can be reduced, and the learning speed can be comparatively increased in our design through an optimal selection of the filter parameters. A general knowledge of the fiber optic hardware, the statistics of the lightwave signal, and the desired goal of the adaptive processing are enough for this optimum selection of the parameters. Detailed computer simulations validate the theoretical results of performance optimization.

© 1991 Optical Society of America

History
Original Manuscript: April 9, 1990
Published: May 10, 1991

Citation
Palacharla Paparao, Anjan Ghosh, and Susan D. Allen, "Design and performance optimization of fiber optic adaptive filters," Appl. Opt. 30, 1826-1838 (1991)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-30-14-1826


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