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Opt Express. 2004 Jan 12;12(1):117-23.

Polarization-independent vertical coupler for photonics integration.

Abstract

We present the first systematic design approach for compact polarization-independent mode-size transformers based on tapered resonant vertical couplers with transfer efficiencies greater than 90%. Resonant coupling occurs at a critical taper width having equal TE and TM effective index. Being polarization-independent broadens the usefulness of vertical coupler as a building block for minimizing insertion loss in photonic integrated circuits.

PMID:
19471517
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