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

Optics Letters
Purnima SethiShankar Kumar Selvaraja

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 μm in comparison to the standard linear taper of length 50 μm, which connects a 10 μm wide waveguide to a 1 μm 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 μm, 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.

References

Jun 3, 2009·Nature·Matt EichenfieldOskar Painter
Apr 30, 2011·Science·T J KippenbergS A Diddams
Feb 22, 2012·Optics Letters·Zhe XiaoPing Shum
Jun 22, 2013·Optics Express·Sebastian Romero-GarcíaJeremy Witzens
Nov 2, 2014·Optics Letters·J T BovingtonJ E Bowers
Feb 26, 2016·Optics Express·Zengkai ShaoSiyuan Yu
Mar 26, 2016·Physical Review Letters·Maxim KarpovTobias J Kippenberg
Jan 7, 2017·Optics Letters·Christopher V PoultonMichael R Watts
Feb 6, 2017·Scientific Reports·Cosimo LacavaPeriklis Petropoulos
Feb 25, 2017·Nature Communications·Atul BhardwajFrank Wuest

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