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

Purnima Sethi; Rakshitha Kallega; Anubhab Haldar; Shankar Kumar Selvaraja

doi:10.1117/12.2289851

23 February 2018 Compact broadband taper for low-loss coupling to a silicon nitride photonic wire

Purnima Sethi, Rakshitha Kallega, Anubhab Haldar, Shankar Kumar Selvaraja

Proceedings Volume 10535, Integrated Optics: Devices, Materials, and Technologies XXII; 1053523 (2018) https://doi.org/10.1117/12.2289851
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

We demonstrate a compact efficient waveguide taper in Silicon Nitride platform. The proposed taper provides a coupling-efficiency of 95% at a length of 19.5 μm in comparison to the standard linear taper of length 50 μm that connects a 10 μm wide waveguide to a 1 μm wide photonic wire. The taper has a spectral response > 75% spanning over 800 nm (spanning O, C & L band) and robustness to fabrication variations; ±200 nm change in taper and end waveguide width varies transmission by <5%. We experimentally report a taper insertion loss of <0.1 dB/transition and reduction in the footprint of the photonic device by 50.8% for the proposed compact taper in comparison to the traditional adiabatic taper. To the best of our knowledge, the proposed taper is the shortest waveguide taper ever reported in Silicon Nitride.

Citation Download Citation

Purnima Sethi, Rakshitha Kallega, Anubhab Haldar, and Shankar Kumar Selvaraja "Compact broadband taper for low-loss coupling to a silicon nitride photonic wire", Proc. SPIE 10535, Integrated Optics: Devices, Materials, and Technologies XXII, 1053523 (23 February 2018); https://doi.org/10.1117/12.2289851

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