Abstract

We report on the design and experimental demonstration of a broadband silicon polarization beam splitter (PBS) with a high extinction ratio $(\mathrm{ER})\ge 30\mathrm{dB}$. This was achieved using triple-bent-waveguide directional coupling in a single PBS, and cascaded PBS topology. For the single PBS, the bandwidths for an $\mathrm{ER}\ge 30\mathrm{dB}$ are 20 nm for the quasi-TE mode, and 70 nm for the quasi-TM mode when a broadband light source (1520–1610 nm) was employed. The insertion loss (IL) varies from 0.2 to 1 dB for the quasi-TE mode and 0.2–2 dB for the quasi-TM mode. The cascaded PBS improved the bandwidth of the quasi-TE mode for an $\mathrm{ER}\ge 30\mathrm{dB}$ to 90 nm, with a low IL of 0.2–2 dB. To the best of our knowledge, our PBS system is one of the best broadband PBSs with an ER as high as $\sim 42\mathrm{dB}$ and a low IL below 1 dB around the central wavelength, and experimentally demonstrated using edge-coupling.

© 2017 Optical Society of America

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