Title :
CMOS-Compatible Polarization Splitting Grating Couplers With a Backside Metal Mirror
Author :
Zaoui, Wissem Sfar ; Kunze, Andreas ; Vogel, Wolfgang ; Berroth, Manfred
Author_Institution :
Inst. of Electr. & Opt. Commun. Eng., Univ. of Stuttgart, Stuttgart, Germany
Abstract :
We present a highly efficient 1-D grating structure that serves to couple light between standard optical fibers and single-mode waveguides in the silicon-on-insulator platform and to split both orthogonal polarization states. The efficiency of the fabricated coupler is enhanced by a backside metal mirror and reaches -2.4 dB for both polarizations at 1552 nm with an extinction ratio >25 dB in a wide wavelength range. The efficiency can be theoretically improved to -1.1 dB when optimizing the number of periods and using a nonuniform grating.
Keywords :
CMOS integrated circuits; diffraction gratings; integrated optoelectronics; mirrors; optical fibre couplers; optical fibre fabrication; optical fibre polarisation; silicon-on-insulator; 1D grating structure; CMOS-compatible polarization splitting grating couplers; Si; backside metal mirror; extinction ratio; nonuniform grating; orthogonal polarization states; silicon-on-insulator platform; single-mode waveguides; standard optical fibers; wavelength 1552 nm; Grating coupler; metal mirror; photonic integrated circuits; polarization splitter; silicon-on-insulator;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2266132
