AI Article Synopsis
- A compact silicon polarization beam splitter (PBS) is created using an asymmetrical directional coupler with a wide and a narrow waveguide that are optimized for TE and TM polarizations.
- The design allows for near-perfect coupling of the TM mode while the TE mode experiences significant uncoupling, making the PBS efficient despite its short length of about 8.13 μm.
- The simulation results indicate that the PBS has a broad operational bandwidth of around 100 nm, a large extinction ratio greater than 10 dB, and low insertion loss under 0.61 dB, while also considering fabrication tolerances.
Article Abstract
A compact silicon polarization beam splitter (PBS) is proposed based on an asymmetrical directional coupler consisting of a wide waveguide and a dielectric loaded narrow waveguide. Given that TE and TM polarizations are the dominant mode in the wide and narrow waveguides, respectively, a perfect phase-matching condition in the TM mode but a huge phase mismatching in the TE mode can be achieved. Therefore, the TE mode is almost uncoupled regardless of device length but the TM mode can only completely couple to the cross port at an appropriate coupling length. An ultrashort (∼8.13 μm long) PBS is designed based on a silicon-on-insulator nanowire with a loading refractive index of 2.0 and a gap width of 200 nm. Numerical simulations show that the proposed PBS has a broad bandwidth (∼100 nm) with large extinction ratio (>10 dB) and low insertion loss (<0.61 dB). The fabrication-error tolerance of the PBS is also discussed.
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| http://dx.doi.org/10.1364/AO.55.003313 | DOI Listing |
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