Signal Enhancement By Spectral Equalization Of High-Frequency Broadband Signals Transmitted Through Optical Fibers

J. W. Ogle; P. B. Lyons; M. A. Holzman

doi:10.1117/12.932063

30 December 1981 Signal Enhancement By Spectral Equalization Of High-Frequency Broadband Signals Transmitted Through Optical Fibers

J. W. Ogle, P. B. Lyons, M. A. Holzman

Author Affiliations +

Proceedings Volume 0288, Los Alamos Conf on Optics '81; (1981) https://doi.org/10.1117/12.932063
Event: Los Alamos Conference on Optics, 1981, Los Alamos, United States

Abstract

A new technique is discussed for signal strength enhancement of high-frequency (>1 GHz), spectrally-broad, analog signals through 1 km of optical fiber. The conventional method for optical measurement of high-frequency gamma ray signals is to use an optical fiber placed in the gamma radiation beam as a Cerenkov transducer. The radiation-induced optical signal is degraded by material dispersion in transmission through the fiber. To reconstruct the signal (which is carried by each wavelength) and preserve the high-frequency components, a narrow-band filter selects an appropriate bandwidth (1 nm). The filtered signal is detected using a high-speed, microchannel-plate (MCP) photomultiplier detector and recorded on high-speed oscilloscopes. This new technique replaces the narrow-band filter with a wavelength multiplexer crevice. The broadband signal input is dispersed by a grating, and narrow spectral components are collected into an array of fibers used as optical delay lines to compensate for the material dispersion in the kilometer of fiber. The delay fibers, each cut to an appropriate length, couple the spectrally equalized light onto the detector. This technique improves the frequency response by eliminating the wing contributions of narrow-band filters, and increases the signal magnitude by utilizing more of the available broadband spectrum. The new technique is applicable to any optical system wherein material dispersion limits system band-width.

Citation Download Citation

J. W. Ogle, P. B. Lyons, and M. A. Holzman "Signal Enhancement By Spectral Equalization Of High-Frequency Broadband Signals Transmitted Through Optical Fibers", Proc. SPIE 0288, Los Alamos Conf on Optics '81, (30 December 1981); https://doi.org/10.1117/12.932063

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