By means of the coupling mode theory and the method of the extension of coupling coefficient, the corresponding coupling model is corrected for PBS. Considering the angle of the two Y-branch waveguides in PBS, the coupling length of 1430 is figured out, which is different from that of 2186μm without considering of the coupling in the Y branches in the previous design. And the simulation of the device performances are carried out by beam propagation method (BPM), the extinction ratio of the TE and TM mode is -26dB and -23dB, respectively.
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