Analysis of polarisation mode splitting characteristic in optical race-track resonator based on silicon-on-insulator rib waveguide

作者:Wei, Liping*; Zang, Junbin; Wang, Yonghua; Cui, Danfeng; Li, Yanna; Liu, Yaoying; Xue, Chenyang
来源:Micro & Nano Letters, 2013, 8(10): 664-667.
DOI:10.1049/mnl.2013.0274

摘要

The detailed design and analysis of a polarisation mode splitting resonator based on a silicon-on-insulator rib waveguide are presented. By analysing the mode birefringence in the ultra-small rib waveguide, the directional coupler is introduced to the microring resonator to realise the splitting of the quasi-TE and quasi-TM polarisation modes from the same output port for a specific wavelength range. It is demonstrated that after splitting the quasi-TM polarisation mode, the Q-value of the quasi-TE polarisation mode is about 2.3 x 10(4), almost twice of that without splitting the quasi-TM polarisation mode. This novel characteristic of a race-track resonator allows it to obtain single polarisation mode at a specific wavelength by itself. This characteristic makes a contribution to accurate wavelength selection, which has been proved to be very useful in the dynamic testing of electrooptical modulators and quite promising in many other applications of optical components.

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