Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler

Yin Xu; Jinbiao Xiao; Xiaohan Sun

doi:10.1117/12.2074727

16 March 2015 Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler

Yin Xu, Jinbiao Xiao, Xiaohan Sun

Author Affiliations +

Proceedings Volume 9357, Physics and Simulation of Optoelectronic Devices XXIII; 935714 (2015) https://doi.org/10.1117/12.2074727
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

A compact polarization beam splitter (PBS) for silicon-based slot waveguides is proposed based on a multimode interference coupler, where an asymmetrical multimode waveguide (AMW), cut by a right angle at one corner, is employed to efficiently separate the TE and TM modes. With the unique modal properties of the slot waveguides and corresponding optimized designs, the input TE mode can almost pass through the AMW and then enter into the bar port, while a mirror image is formed at the cross port for the input TM mode due to the self-imaging effect. Meanwhile, tapered waveguide structures and S-bend are incorporated into the designed PBS for further enhancing the performance. According to the numerical results, a PBS with an AMW of 2.3 μm in length is achieved, where the extinction ratios are 16.6 and 20.9 dB, respectively, for TE and TM modes, and the insertion losses are 1.37 and 0.81 dB, respectively, at the wavelength of 1.55 μm. For keeping extinction ratios over 15 and 20 dB for TE and TM modes, the bandwidths are around 59 and 73 nm, respectively, both covering the entire C-band. In addition, field evolution along the propagation distance through the PBS is also demonstrated.

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Yin Xu, Jinbiao Xiao, and Xiaohan Sun "Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler", Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 935714 (16 March 2015); https://doi.org/10.1117/12.2074727

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KEYWORDS

Waveguides

Silicon

Polarization

Beam splitters

Brain-machine interfaces

Dielectric polarization

Mirrors

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