Multiple Layers of Silicon-Silica (Si-SiO2) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler

Md Asaduzzaman; Masuduzzaman Bakaul; Stan Skafidas; Md Rezwanul Haque Khandokar

doi:10.20944/preprints201608.0044.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 4 August 2016 / Approved: 4 August 2016 / Online: 4 August 2016 (12:00:43 CEST)

A single mode waveguide grating coupler based on multiple Si-SiO₂ pairs onto Si substrate has been designed. Numerical analysis has been carried out to calculate optimum thickness of the layers of Si-SiO₂ that ensures the constructive interference between reflected waves and actual guided wave for high coupling efficiency. Based on the results, an optimal design is developed and modeled by using a 2-D finite difference time domain (2-D FDTD) simulator that dictates a coupling efficiency of as much as 78% (-1.07 dB) at the wavelength of 1550 nm, and a 1-dB bandwidth of 77 nm. The numerical method will be useful to calculate the optimum thicknesses of the layers for any reflector based grating coupler of different materials.

grating coupler; silicon photonics; optical interconnects; fiber interface; nanophotonics

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Multiple Layers of Silicon-Silica (Si-SiO₂) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler

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