Interferometric Surface-Wave Acousto-Optic Time-Integrating Correlators

Abstract

A novel structure for a coherent-interferometric acousto-optic (AO) time-integrating correlator has been implemented by using a single surface acoustic wave (SAW) device with tilted transducers to reduce intermodulation terms. 175 MHz, a bandwidth of 60 MHz, and a time aperture of about 10 ps. The instantaneous bandwidth of the A0 correlator is determined by the spacing density of the photodetector array, with a potential of 120 MHz. Typical integration times are 30 to 40 ms, providing processing gains in excess of l o 6 , Such a device is very useful in providing fast synchronization of communication links. In addition, the device can demodulate to base band and simultaneously act as a synchronization lock monitor for moderate data rates. Where processing may be limited by doppler shifts, a two-dimensional architecture has been imgl.emented to allow full processing gain e

Analysis of DNA sequences by an optical time-integrating correlator

“…perform the correlation of two signals. The many possible ways to build TICs are well documented in the literature [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] and good review papers are available [15,21,27].…”