Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171452
