Abstract
A novel and simple polarization independent grating couplers is designed and
analyzed here, in which the TE polarization and the TM polarization light can be
simultaneously coupled into a silicon waveguide along the same direction with high
coupling efficiency. For the polarization-insensitive grating coupler, the coupling
efficiencies of two orthogonal polarizations light are more than 60% at 1550 nm
wavelength based on our optimized design parameters including grating period, etching
height, filling factor, and so on. For TE mode the maximum efficiency is ∼72% with more
than 30 nm 1 dB bandwidth, simultaneously, for TM mode the maximum efficiency is 75.15%
with 40 nm 1 dB bandwidth. Their corresponding wavelength difference between two
polarizations’ coupling peaks is demonstrated to be 35 nm. Polarization independent
grating coupler designed here can be widely used in optical communication and optical
information processing.
© 2015 Chinese Laser Press
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