Compact single-etched sub-wavelength grating couplers for O-band application Article Swipe

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Optics Materials science Bandwidth (computing) Grating Wavelength Broadband Diffraction grating Optoelectronics Diffraction efficiency Physics Telecommunications Computer science

Yun Wang , Luhua Xu , Amar Kumar , Yannick D’Mello , David Patel , Zhenping Xing , Rui Li , Md. Ghulam Saber , Eslam El‐Fiky , David V. Plant ·

YOU? · · 2017 · Open Access · · DOI: https://doi.org/10.1364/oe.25.030582 · OA: W2768837478

We demonstrate two single-etched sub-wavelength grating coupler (SWGC) designs for O-band application, one targeting at high coupling efficiency and the other targeting at broad operating bandwidth. The high-efficiency SWGC has a measured peak coupling efficiency of -3.8 dB and a 3-dB bandwidth of 40 nm, and the broadband SWGC has a measured peak coupling efficiency of -4.3 dB and a 3-dB bandwidth of 71 nm. Focusing gratings have been used in our SWGCs to reduce the design footprints and the dimensions of our SWGCs are smaller than 45 μm × 24 μm. The back reflections of our SWGCs are suppressed to be below -15 dB over the wavelength range from 1260 nm to 1360 nm.