High-efficiency grating-couplers: demonstration of a new design strategy

We present a simple and practical strategy that allows to design high-efficiency grating couplers. The technique is based on the simultaneous apodization of two structural parameters: the grating period and the fill-factor, along with the optimization of the grating coupler etching depth. Considering a 260 nm Si-thick Silicon-on-insulator platform, we numerically demonstrated a coupling efficiency of −0.8 dB (83%), well matching the experimental value of −0.9 dB (81%). Thanks to the optimized design, these results represent the best performance ever reported in the literature for SOI structures without the use of any back-reflector.

[1]  Lee Carroll,et al.  Optimising apodized grating couplers in a pure SOI platform to -0.5 dB coupling efficiency. , 2015, Optics express.

[2]  Daoxin Dai,et al.  Ultra-small Si-nanowire-based 400 GHz-spacing 15 X 15 arrayed-waveguide grating router with microbends , 2011 .

[3]  R. Baets,et al.  High efficiency Silicon-on-Insulator grating coupler based on a poly-Silicon overlay. , 2006, Optics express.

[4]  Yunhong Ding,et al.  Ultra-high-efficiency apodized grating coupler using a fully etched photonic crystal , 2013, 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR).

[5]  T. Krauss,et al.  Compact and Highly Efficient Grating Couplers Between Optical Fiber and Nanophotonic Waveguides , 2007, Journal of Lightwave Technology.

[6]  Roberto Gaudino,et al.  Low-Loss Micro-Resonator Filters Fabricated in Silicon by CMOS-Compatible Lithographic Techniques: Design and Characterization , 2017 .

[7]  ENOIT,et al.  Group-velocity dispersion in SOI-based channel waveguides with reduced-height , 2017 .

[8]  Huihui Lu,et al.  Photonic Packaging: Transforming Silicon Photonic Integrated Circuits into Photonic Devices , 2016 .

[9]  G. Islan,et al.  Design and characterization , 2016 .

[10]  B. Jalali,et al.  Silicon Photonics , 2006, Journal of Lightwave Technology.

[11]  Kresten Yvind,et al.  Fully etched apodized grating coupler on the SOI platform with -0.58 dB coupling efficiency. , 2014, Optics letters.

[12]  Lech Wosinski,et al.  Highly efficient nonuniform grating coupler for silicon-on-insulator nanophotonic circuits. , 2010, Optics letters.

[13]  E. Sleeckx,et al.  Highly efficient grating coupler between optical fiber and silicon photonic circuit , 2009, 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum electronics and Laser Science Conference.

[14]  Siegfried Janz,et al.  Fiber-chip edge coupler with large mode size for silicon photonic wire waveguides. , 2016, Optics express.

[15]  Guo-Qiang Lo,et al.  A High-Efficiency Nonuniform Grating Coupler Realized With 248-nm Optical Lithography , 2013, IEEE Photonics Technology Letters.

[16]  Dong Wook Kim,et al.  Comparative Study of Uniform and Nonuniform Grating Couplers for Optimized Fiber Coupling to Silicon Waveguides , 2016 .

[17]  H. Tsang,et al.  Apodized Waveguide Grating Couplers for Efficient Coupling to Optical Fibers , 2010, IEEE Photonics Technology Letters.

[18]  Periklis Petropoulos,et al.  Nonlinear silicon photonic signal processing devices for future optical networks , 2017 .

[19]  Ke Li,et al.  Recent breakthroughs in carrier depletion based silicon optical modulators , 2014 .

[20]  R. Baets,et al.  Compact efficient broadband grating coupler for silicon-on-insulator waveguides. , 2004, Optics letters.

[21]  P. Verheyen,et al.  High-efficiency fiber-to-chip grating couplers realized using an advanced CMOS-compatible silicon-on-insulator platform. , 2010, Optics express.

[22]  Manfred Berroth,et al.  Bridging the gap between optical fibers and silicon photonic integrated circuits. , 2014, Optics express.

[23]  D. Trotter,et al.  High performance waveguide-coupled Ge-on-Si linear mode avalanche photodiodes. , 2016, Optics express.

[24]  P. Dumon,et al.  Silicon microring resonators , 2012 .