Abstract
A physical micromachining technique is demonstrated in a low-loss flat-fiber
substrate to fabricate a multimode interference (MMI) device. The flat-fiber substrate
is a low-index-contrast material; however, by making use of two physically micromachined
trenches, lateral confinement is achieved providing high index contrast for the MMI
region. A 1 x 3 MMI device exhibiting 1.89 dB of excess loss has been
demonstrated.
© 2012 IEEE
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