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CMOS-Compatible Polarization Splitting Grating Couplers With a Backside Metal Mirror

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4 Author(s)
Zaoui, W.S. ; Inst. of Electr. & Opt. Commun. Eng., Univ. of Stuttgart, Stuttgart, Germany ; Kunze, A. ; Vogel, W. ; Berroth, M.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 14 )