A spatial-spectral holographic correlator at 1536 nm using 30-symbol BPSK and QPSK codes optimized for secure communications

Summary form only given. Spatial-spectral holographic devices combine spectral hole burning with conventional holography to perform correlations and other signal processing and memory functions in real time and are ideally suited to process multi-phase encoded information. Such devices can operate at bandwidths greater than 10 GHz, have time-bandwidth products of 10/sup 3/ to 10/sup 5/ and can potentially enhance optical telecommunications capabilities. Employing Er/sup 3+/:Y/sub 2/SiO/sub 5/, we demonstrate excellent signal fidelity in the important telecommunications band around 1550 nm. We further believe this to be the maximum number of symbols yet achieved for correlations with optimized codes.