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Proceedings Paper

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

Paper Details

Date Published: 16 March 2015
PDF: 7 pages
Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 935714 (16 March 2015); doi: 10.1117/12.2074727
Show Author Affiliations
Yin Xu, Southeast Univ. (China)
Jinbiao Xiao, Southeast Univ. (China)
Xiaohan Sun, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 9357:
Physics and Simulation of Optoelectronic Devices XXIII
Bernd Witzigmann; Marek Osiński; Fritz Henneberger; Yasuhiko Arakawa, Editor(s)

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