Acta Photonica Sinica, Volume. 42, Issue 7, 777(2013)
Design of High Efficiency Grating Coupler for Vertical Coupling
A high-efficiency grating coupler is designed for vertical coupling between silicon-on-insulator waveguides and single-mode fibers. The reflection characteristics of reflector grating and distributed bragg reflector are employed to obtain a high reflection from the right side and bottom of the coupler. The reflected light is interfered destructively to reduce the negative second-order reflection by selecting a reasonable spacing between the reflector grating and the coupler grating when the coupler grating is in the vertical coupling. The coupler is optimized using eigenmode expansion-based simulations. The highest coupling efficiency of 89% at a wavelength 1 550 nm is achieved by simulation. The results provide some useful references for the fabrication of the actual vertical coupling grating coupler.
Get Citation
Copy Citation Text
WU Hua, GUO Xia, HAN Ming-fu. Design of High Efficiency Grating Coupler for Vertical Coupling[J]. Acta Photonica Sinica, 2013, 42(7): 777
Received: Mar. 18, 2013
Accepted: --
Published Online: Jul. 16, 2013
The Author Email: Hua WU (wh1125@126.com)