Compact polarization beam splitter for silicon photonic integrated circuits with a 340-nm-thick silicon core layer

Optics Letters
Chenlei Li, Daoxin Dai

Abstract

A polarization beam splitter (PBS) is proposed and realized for silicon photonic integrated circuits with a 340-nm-thick silicon core layer by introducing an asymmetric directional coupler (ADC), which consists of a silicon-on-insulator (SOI) nanowire and a subwavelength grating (SWG) waveguide. The SWG is introduced to provide an optical waveguide which has much higher birefringence than a regular 340-nm-thick SOI nanowire, so that it is possible to make the phase-matching condition satisfied for TE polarization only in the present design when the waveguide dimensions are optimized. Meanwhile, there is a significant phase mismatching for TM polarization automatically. In this way, the present ADC enables strong polarization selectivity to realize a PBS that separates TE and TM polarizations to the cross and through ports, respectively. The realized PBS has a length of ∼2  μm for the coupling region. For the fabricated PBS, the extinction ratio (ER) is 15-30 dB and the excess loss is 0.2-2.6 dB for TE polarization while the ER is 20-27 dB and the excess loss is 0.3-2.8 dB for TM polarization when operating in the wavelength range of 1520-1580 nm.

References

Jun 11, 2008·Optics Express·Hiroshi FukudaSei-Ichi Itabashi
Mar 14, 2013·Optics Express·Shahram KeyvaniniaJean-Marc Fedeli
Oct 17, 2014·Optics Express·Valentina DonzellaLukas Chrostowski

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Citations

Aug 19, 2018·Optics Express·Md Ghulam SaberDavid V Plant
Jul 8, 2020·Optics Letters·José Manuel Luque-GonzálezRobert Halir
Dec 17, 2017·Optics Express·Ke MaDaoxin Dai

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