Abstract
Fiber optic delay lines have been suggested for use in tapped delay line architectures for performing cross-correlation operations.1-3 Figure 1 shows a diagram of a fiber optic tapped delay line correlator. Since the summation of the weighted signals with different time-delays is performed spatially by a lens, this system can be viewed as a space-integrating architecture. Although attractive because of the potential for high bandwidth operation, this system suffers from two major limitations. The number of taps limits the signal length and therefore the correlation gain, since each tap introduces signal loss, the total number of taps will be limited to a few hundred. Additionally, the system shown cannot implement real-time cross correlations between two arbitrary signals. Similarly, calculation of the autocorrelation of a signal requires temporary storage of the signal and high bandwidth updating of tap weights.
© 1993 Optical Society of America
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