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Ultra-compact waveguide crossing for a mode-division multiplexing optical network

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Abstract

We propose and experimentally demonstrate an ultra-compact multimode waveguide crossing that can process two modes simultaneously. The symmetric Y-junction is introduced to split the high-order modes into fundamental ones, easing the subsequent processing. The footprint of the proposed crossing is as compact as 21μm×21μm. The measured results show an insertion loss of 1.82dB for the TE0 mode and 0.46dB for the TE1 mode at 1550 nm, as well as a crosstalk of <18dB from 1510 to 1600 nm.

© 2017 Optical Society of America

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