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High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling

2019-11-01

Authors: Zhang, ZY; Chen, X; Cheng, Q; Khokhar, AZ; Yan, XZ; Huang, BJ; Chen, HD; Liu, HW; Li, HQ; Thomson, DJ; Reed, GT

OPTICS LETTERS

Volume: 44 Issue: 20 Pages: 5081-5084 Published: OCT 15 2019 Language: English Document type: Article

DOI: 10.1364/OL.44.005081

Abstract:

We propose and experimentally demonstrate an apodized bidirectional grating coupler for high-efficiency, perfectly vertical coupling.

Through grating apodization, the coupling efficiency (CE) can be notably improved, and the parasitic reflections can be minimized. For ease

of fabrication, subwavelength gratings are introduced, which are also beneficial for the coupling performance. Simulation shows a record CE

of 72%. We found that the coupler is quite robust to the variation of incidence mode field diameter and fiber misalignment. A CE of -1.8 dB

is experimentally measured with a 1-dB bandwidth of 37 nm. (C) 2019 Optical Society of America

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