Abstract In this paper a compact polarization beam splitter based on a deformed photonic crystal directional coupler is designed and simulated. The transverse-electric (TE) guided mode and transverse-magnetic (TM) guided mode are split due to different guiding mechanisms. The effect of the shape deformation of the air holes on the coupler is studied. It discovered that the coupling strength of the coupled waveguides is strongly enhanced by introducing elliptical airholes, which reduce the device length to less than 18.5$\mu$m. A finite-difference time-domain simulation is performed to evaluate the performance of the device, and the extinction ratios for both TE and TM polarized light are higher than 20 dB.
Received: 05 June 2007
Revised: 01 January 2008
Accepted manuscript online:
(Design and performance testing of integrated-optical systems)
Fund: Project supported by
National Key Basic Research Special Fund of China (Grand No
2006CB921701-705).
Cite this article:
Ren Gang(任刚), Zheng Wan-Hua(郑婉华), Wang Ke(王科), Du Xiao-Yu(杜晓宇), Xing Ming-Xin(邢名欣), and Chen Liang-Hui(陈良惠) Design of a compact polarization beam splitter based on a deformed photonic crystal directional coupler 2008 Chin. Phys. B 17 2553
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