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Abstract
This paper defines new structures of highly unidirectional uniform optical grating
couplers which are all within constraints of the standard 45nm SOI-CMOS foundry process.
Analysis in terms of unidirectivity and coupling efficiency is done. Maximum achieved
unidirectivity (power radiation in one direction) is 98%. Unidirectional uniform gratings
are fabricated in the standard 45nm SOI-CMOS foundry process. These gratings are measured
and compared, using the new method of comparison, with typical bidirectional uniform
gratings fabricated in the same process, in terms of coupling efficiency (in this
case unidirectivity) with the standard singlemode fiber. For both types of gratings
spectrum is given, measured with optical spectrum analyzer.