Compact broadband low-loss taper for coupling to a silicon nitride photonic wire

Sethi, Purnima and Kallega, Rakshitha and Haldar, Anubhab and Selvaraja, Shankar Kumar (2018) Compact broadband low-loss taper for coupling to a silicon nitride photonic wire. In: OPTICS LETTERS, 43 (14). pp. 3433-3436.

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Abstract

We demonstrate an ultra-compact waveguide taper on a silicon nitride platform. The proposed taper provides a coupling efficiency of 95% at a length of 19.5 mu m in comparison to the standard linear taper of length 50 mu m, which connects a 10 mu m wide waveguide to a 1 mu m wide photonic wire. The taper has a spectral response > 75% spanning over 800 nm and resilience to fabrication variations; +/- 200 nm change in taper and end waveguide width varies transmission by <5%. We experimentally demonstrate taper insertion loss of <0.1 dB/transition for a taper as short as 19.5 mu m, and reduce the footprint of the photonic device by 50.8% compared to the standard adiabatic taper. To the best of our knowledge, the proposed taper is the shortest waveguide taper ever reported in silicon nitride. (C) 2018 Optical Society of America

Item Type:	Journal Article
Publication:	OPTICS LETTERS
Publisher:	OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Additional Information:	Copy right for this article belong to OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	23 Aug 2018 16:00
Last Modified:	25 Aug 2022 08:48
URI:	https://eprints.iisc.ac.in/id/eprint/60486

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