Share Email Print

Proceedings Paper

Signal Enhancement By Spectral Equalization Of High-Frequency Broadband Signals Transmitted Through Optical Fibers
Author(s): J. W. Ogle; P. B. Lyons; M. A. Holzman
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 30 December 1981
PDF: 5 pages
Proc. SPIE 0288, Los Alamos Conf on Optics '81, (30 December 1981); doi: 10.1117/12.932063
Show Author Affiliations
J. W. Ogle, Los Alamos National Laboratory (United States)
P. B. Lyons, Los Alamos National Laboratory (United States)
M. A. Holzman, Los Alamos National Laboratory (United States)

Published in SPIE Proceedings Vol. 0288:
Los Alamos Conf on Optics '81
Donald H. Liebenberg, Editor(s)

© SPIE. Terms of Use
Back to Top