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

Kumar, A and Nambiar, S and Kallega, R and Ranganath, P and Ea, P and Selvaraja, SK (2021) High-efficiency vertical fibre-to-polymer waveguide coupling scheme for scalable polymer photonic circuits. In: Optics Express, 29 (7). pp. 9699-9710.

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Official URL: https://doi.org/10.1364/OE.412266


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. © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Item Type: Journal Article
Publication: Optics Express
Publisher: The Optical Society
Additional Information: The copyright for this article belongs to The Optical Society
Keywords: Efficiency; Nonlinear optics; Optical communication; Optical fibers; Optical properties; Polymers; Signal processing; Silicon nitride; Silicon wafers; Timing circuits; Waveguide components; WSI circuits, Coupling efficiency; Efficient surface; Grating couplers; High-efficiency; Linear and nonlinear optical properties; Polymer photonics; Polymer waveguides; Vertical coupling, Optical waveguides
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 29 Mar 2021 11:05
Last Modified: 29 Mar 2021 11:05
URI: http://eprints.iisc.ac.in/id/eprint/68584

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