Broadband silicon polarization beam splitter with a high extinction ratio using a triple-bent-waveguide directional coupler

We report on the design and experimental demonstration of a broadband silicon polarization beam splitter (PBS) with a high extinction ratio (ER)≥30  dB. This was achieved using triple-bent-waveguide directional coupling in a single PBS, and cascaded PBS topology. For the single PBS, the bandwidths f...

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Bibliographic Details
Published in:Optics letters 2017-11, Vol.42 (21), p.4450-4453
Main Authors: Ong, Jun Rong, Ang, Thomas Y L, Sahin, Ezgi, Pawlina, Bryan, Chen, G F R, Tan, D T H, Lim, Soon Thor, Png, Ching Eng
Format: Article
Language:English
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Summary:We report on the design and experimental demonstration of a broadband silicon polarization beam splitter (PBS) with a high extinction ratio (ER)≥30  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 ER≥30  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 ER≥30  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 ∼42  dB and a low IL below 1 dB around the central wavelength, and experimentally demonstrated using edge-coupling.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.42.004450