We propose a new optical implementation of orthogonal phase-code multiplexing in which an arbitrary phase shift of θ or θ +π is used in the reference beam instead of 0 or π as in the conventional method. To compare the new and the conventional methods, we employ a 2-bit orthogonal phase code and store two binary-data images in a BaTiO₃ crystal with each method. We also employ numerical methods to simulate the 2-bit phase-code multiplexing and show that the signal-to-noise ratio in the restored images is improved by more than one order of magnitude in the new method in our experimental conditions.

© 2001 Optical Society of America

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