Acousto-optic channelizer study

Author

Powers, J.P. ; Harvey, J.P. ; Marinsalta, D.

Author_Institution

Dept. of Electr. & Comput. Eng., US Naval Postgraduate Sch., Monterey, CA, USA

fYear

1990

fDate

4-7 Dec 1990

Firstpage

689

Abstract

A coherent acoustooptic spectrum analyzer has been used to channelize a wideband RF signal into several narrowband signals. The channelizer features a Bragg cell used to physically spread out the wave´s spectrum, a reference beam, and a fiber-optic array with each fiber leading to an optical detector. The effects of imperfections in the channelizing process caused by the physical setup were investigated. These effects can be characterized as notches in the bandpass frequency filter. Experimentally these notches have depths of 0.5 to 1.5 dB. The phase linearity of the response is within 5 degrees. The effects of these notches and of experimental techniques to alleviate the effects on the signal are described. Experimental results demonstrating the successful transmission and recovery of a BPSK (binary phase shift keying) spread-spectrum signal are also presented

Keywords

acousto-optical devices; fibre optic sensors; notch filters; phase shift keying; signal processing equipment; spectral analysers; BPSK spread spectrum signal; Bragg cell; bandpass frequency filter; coherent acoustooptic spectrum analyzer; fiber-optic array; notches; reference beam; response phase linearity; wideband RF signal channelizer; Band pass filters; Binary phase shift keying; Frequency; Narrowband; Optical arrays; Optical detectors; RF signals; Sensor arrays; Spectral analysis; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171452

Filename

171452