Calculation of the Fourier spectrum of the orthogonal phase-coded beam shows that in order to maintain phase-only modulation and orthogonality in the reference beam pattern, the phase modulator should be imaged to the recording plane.
© 2011 OSA
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(090.4220) Holography : Multiplex holography
(210.1635) Optical data storage : Coding for optical storage
W. Song and S. Tao, "Fundamental Study on Hybrid Orthogonal-Phase Coding and Spatial Multiplexing for Holographic Data Storage," in Digital Holography and Three-Dimensional Imaging, OSA Techinal Digest (CD) (Optical Society of America, 2011), paper DWF5.