We show that input and output coupling have an extremely strong effect on the
performance of a metal-clad polarizer integrated in an optical circuit, with the
extinction ratios showing large oscillations for small changes in device length
for conventional low-index buffers. We further show that if high-index buffers
are used, very high extinction ratios for very short devices can be achieved;
moreover, such devices are insensitive to small changes in device lengths.
© 1995 Optical Society of America
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