Ultra-compact broadband high efficient grating coupler

Author

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

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Melbourne, VIC, Australia

fYear

2015

fDate

23-25 April 2015

Firstpage

31

Lastpage

34

Abstract

We present an ultra-compact metal reflector based grating coupler for coupling light between optical fiber and nano photonic waveguides. The coupler is designed and simulated based on Finite Difference Time Domain (FDTD) method. The lateral dimension of the grating waveguide has been tapered down from 10 μm to 400 nm within 8 μm length to interface with nano photonic waveguides using half overlay triangular waveguides. We have achieved a coupling efficiency of 94% (-0.25dB) using metal reflector and after the cascaded triangular waveguides, the efficiency remains as high as 80% (-0.95dB) with 1-dB bandwidth of 80 nm. The total length of the coupler is as low as 24 μm which provides very small foot print in silicon (Si) photonic ICs.

Keywords

diffraction gratings; elemental semiconductors; finite difference time-domain analysis; integrated optics; nanophotonics; optical fibre couplers; silicon; Si; cascaded triangular waveguides; coupling efficiency; finite difference time domain method; half overlay triangular waveguides; high efficient grating coupler; lateral dimension; light coupling; nanophotonic waveguides; optical fiber; silicon photonic IC; size 8 mum; ultra-compact broadband grating coupler; ultra-compact metal reflector; Couplers; Couplings; Fiber gratings; Gratings; Optical waveguides; Photonics; Silicon; Diffrcation grating; Grating coupler; Photonic integrated circuits; Silicon photonics;

fLanguage

English

Publisher

ieee

Conference_Titel

Broadband and Photonics Conference (IBP), 2015 IEEE International

Conference_Location

Bali

Print_ISBN

978-1-4799-8474-9

Type

conf

DOI

10.1109/IBP.2015.7230761

Filename

7230761