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Compact Variable {\rm TE} - {\rm TM} Polarization Splitter Based on Simplified Coherent Coupling in Lithium Niobate

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3 Author(s)
Chia-Wei Lin ; Grad. Inst. of Electron. Eng., Nat. Taiwan Univ., Taipei ; Wen-Hung Huang ; Wang, Way‐Seen

A compact-sized electrically tunable TE-TM mode splitter composed of a mode converter and an asymmetric Y-branch structure is presented. The asymmetric Y-branch consists of a straight and a bent waveguides to split two polarization modes based on the mode-sorting effect. To shorten the device length, a simplified coherently coupled-bending structure is utilized for the bent waveguide. Experimental results show that the device length is reduced about 52%, extinction ratios of both TE and TM modes are higher than 25 dB, yet the applied voltage is not significantly increased.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 13 )