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High-efficiency dual-band-multiplexing three-port grating coupler on 220-nm silicon-on-insulator with 248-nm deep-UV lithography

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Abstract

We experimentally demonstrate a novel, to the best of our knowledge, three-port grating coupler (TPGC) for dual-wavelength-band operation. The TPGC can couple light to/from two ports for S/C-band with polarization diversity and a third port for O-band. Such a coupling scheme could be applied in an integrated wavelength-division-multiplexing passive optical network (PON) unit, benefiting a polarization-diverse receiver for downstream S/C-band and transmitter for upstream O-band. The device is fabricated on a multi-project wafer, with peak coupling efficiency measured to be ${-}{3.8}\;{\rm dB}$ and ${-}{5.4}\;{\rm dB}$ for O-band and S/C-band, respectively. We also present a proof-of-concept demonstration for 10-Gb/s PON transmission based on the TPGC.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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