Abstract

The implementation of optical perfect shuffle network by has been discussed by various authors.^1,2 Their methodologies involve the use of either microlens array or four off-axis subholograms to generate perfect shuffle pattern. Recently, S. H. Song et. al.³ decided to integrate a two dimensional square gratings on a ordinary Fresnel zone plate to provide the same result, i.e. both imaging and fanout, and would give a higher spatial bandwidth product. The implementation of this approach is shown by Fig. 1a & 1b. The slightly shifted input array pattern in Fig. la, after passing through the designed hologram, is duplicated four times and imaged at the back focal plane. The desired perfect shuffle output can be obtained from the interlaced central region of the image. However, one short-coming of Fresnel zone plate is the presence of high orders foci which can lead to cross-talk errors.

© 1995 IEEE