Zhan-Qiang HUI, Bin LI, Tian-Tian LI, Dong-Dong HAN, Jia-Min GONG. Silicon-based C-band low-loss compact polarization splitter rotator based on PSO algorithm[J]. Journal of Infrared and Millimeter Waves, 2023, 42(1): 132
- Journal of Infrared and Millimeter Waves
- Vol. 42, Issue 1, 132 (2023)
Fig. 1. The PSR is composed of mode converter and mode beam splitter: (a) 3D view, (b) side view
Fig. 2. The effective refractive index（TE0、TM0 and TE1 modes）of air-clad strip silicon waveguide versus waveguide width（central wavelength 1 550 nm）
Fig. 3. Flow diagram of PSO optimization
Fig. 4. （a）Top view of PSO optimized structure，（b）top view of structure after PSO combined with spline interpolation fitting，（c）the variation of mode conversion efficiency with device length after different iteration times and interpolation optimization
Fig. 5. （a）Variation of mode conversion efficiency and mode field distribution with device length under optimal parameters，（b）other mode converter related literature for comparison
Fig. 6. （a）Top view of PSO optimized structure，（b）the variation process of FOM with the number of iterations，the inset shows the variation process of mode coupling efficiency with the coupling length at 40 iterations
Fig. 7. Mode profile transmission distribution：（a）TE0 mode incident，（b）TE0 mode incident，plot of IL，CT，and PER with wavelength：（c）TE0 mode incident，（d）TM0 mode incident
Fig. 8. Tolerance analysis: (a) △g=+10 nm, (b) △g=-10 nm, (c) △w1=+10 nm, (d) △w1=-10 nm, (e) △w2=+10 nm, (f) △w2=-10 nm, (g) △w3=+10 nm, (h) △w3=-10 nm, (i) △w4=+10 nm, (j) △w4=-10 nm
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Table 1. Structure parameters of TM0-TE1 mode converter optimized by PSO
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Table 2. Structure parameters of TM0-TE1 mode converter optimized by spline interpolation fitting
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Table 3. Left waveguide structural parameters of mode beam splitter optimized by PSO
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Table 4. Performance comparison of mode evolution PSR
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Table 5. Tolerance analysis of structural parameters
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