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High-efficiency vertical fibre-to-polymer waveguide coupling scheme for scalable polymer photonic circuits

TitleHigh-efficiency vertical fibre-to-polymer waveguide coupling scheme for scalable polymer photonic circuits
Publication TypeJournal Article
Year of Publication2021
AuthorsKumar, A, Nambiar, S, Kallega, R, Ranganath, P, Ea, P, Selvaraja, SKumar
JournalOptics Express
Volume29
Pagination9699–9710
Abstract

Polymer photonic circuits offer a versatile platform for various applications, including communication, sensing and optical signal processing. Though polymers offer broadband, linear and nonlinear optical properties, the coupling between an optical fibre and a polymer waveguide has been a challenge. In this work, we propose and demonstrate a wafer-scale vertical coupling scheme for polymer waveguides. The scheme uses a silicon nitride grating coupler with an inverse taper to couple between an optical fibre and a SU8 polymer waveguide. We demonstrate a maximum coupling efficiency of -3.55 dB in the C-band and -2.92 dB in the L-band with a 3-dB bandwidth of 74 and 80 nm, respectively. A detailed design and simulation, fabrication, and characterisation results are presented. The scheme demonstrates a scalable and efficient surface grating approach for polymer photonic integrated circuits.