Abstract
Diffractive optical elements as deflectors for optical free-space interconnects have been proposed by several authors.1,2 Unfortunately, the high flexibility of such elements is in many cases outweighed by the strong chromatic aberrations. Surface relief gratings have commonly a rather low carrier frequency (due to the limited resolution of the lithography) and, therefore, the chromatic aberrations are less severe. For volume gratings with their high carrier frequency a close cascade geometry has been proposed to reduce the chromatic aberrations.3,4 Another possibility for optical interconnects is spaceinvariant imaging of the transmitters onto the receivers? Both approaches have been demonstrated for an optical backplane (Fig. 1).
© 1994 IEEE
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