Suppression of sidelobes in the far-field radiation patterns of optical waveguide arrays

Abeles, J. H.; Deri, R. J.
October 1988
Applied Physics Letters;10/10/1988, Vol. 53 Issue 15, p1375
Academic Journal
Arrays of coherent optical emitters are attractive for high-speed, wide-angle optical beamsteering or deflection, but uniform arrays radiate undesirable sidelobes. It is shown that dramatic suppression of sidelobes can be accomplished by configuring emitters in a nonuniform pattern. A nearly optimum radiation pattern for scanning results from gradually doubling the interelement spacing across a one-dimensional array. As an example, a 100-element waveguide array of minimum interelement spacing 5 μm radiates a 0.08° main lobe (full width at half-maximum) with a 30× suppression of sidelobe intensity.


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