Tolerant wideband high-efficiency grating coupler for TM mode excitation
Shum, Perry Ping
Date of Issue2012
Photonics Global Conference (2012 : Singapore)
School of Electrical and Electronic Engineering
An optimized grating coupler featuring both ultra-broad bandwidth and high-efficiency has been achieved for the first time for the +1 diffraction order at a central operating wavelength 1.55 μm for TM polarization in horizontal slot waveguides. With proper design of the thickness of the groove thickness in grating region, we achieved a 60 nm 1 dB bandwidth, and the 3 dB bandwidth is 92 nm covering the entire C-band, and most of L-band and S-band. It is nearly two times more than the previously reported value. Maximum coupling efficiency of 65% has been achieved for positive detuned grating couplers with incident light from SMF at 8o. Sensitivity to fabrication and alignment tolerances of the structure has been analyzed.
DRNTU::Engineering::Electrical and electronic engineering
© 2012 IEEE.