Optical 30-symbol quadriphase-shift keyed (QPSK) and binary-phase-shift keyed (BPSK) codes were processed in a spatial-spectral holographic correlator with the Er<sup>3+</sup>: Y<sub>2</sub>SiO<sub>5</sub> spectral hole-burning material operating at 1536 nm in the important 1550-nm communications band. The results demonstrate the ability of spatial-spectral holographic correlators to process QPSK codes and BPSK codes with the same apparatus. The high-fidelity correlations produced by this optical coherent transient device exhibit the low sidelobe characteristics expected for the codes used.
© 2000 Optical Society of America
(060.4510) Fiber optics and optical communications : Optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(070.4550) Fourier optics and signal processing : Correlators
(090.7330) Holography : Volume gratings
(200.4560) Optics in computing : Optical data processing
T. L. Harris, Y. Sun, W. R. Babbitt, R. L. Cone, J. A. Ritcey, and R. W. Equall, "Spatial-spectral holographic correlator at 1536 nm using 30-symbol quadriphase- and binary-phase-shift keyed codes," Opt. Lett. 25, 85-87 (2000)