Chinese Optics Letters, 2016, 14 (8): 081301, Published Online: Aug. 3, 2018
Design of an ultra-broadband and fabrication-tolerant silicon polarization rotator splitter with SiO2 top cladding
Figures & Tables
Fig. 1. Schematic of the proposed device based on a cascaded adiabatic bi-level taper and mode-evolution counter-tapered coupler.
Fig. 2. (a) The calculated effective refractive indices of the first three modes in the waveguide cross section along the bi-level taper at wavelengths of 1310 nm (dashed) and 1550 nm (straight). (b) The electric field profiles of the first two modes in the cross section along this taper at the wavelength of 1310 nm.
Fig. 3. (a) The mode conversion efficiency from the TM 0 mode to TE 1 mode in the bi-level taper as the L tp 1 varies with the second taper length L tp 2 = 15 , 20, and 25 μm at the wavelength of 1310 nm (dashed) and 1550 nm (straight). (b) Wavelength dependence of the mode conversion efficiency when L tp 1 = 28.5 μm and L tp 2 = 25 μm . Inset: simulated electric field intensity distributions in the bi-level taper as the TM 0 mode launched at 1310 and 1550 nm wavelengths.
Fig. 4. (a) The calculated effective refractive indices of the modes (TE 0 / TE 0 and TE 1 ) in the cross/through waveguide of the counter-tapered coupler with width tapering from 0.18/0.72 to 0.4/0.5 μm at wavelengths of 1310 nm (dashed) and 1550 nm (straight). (b) Mode conversion loss from the launched TE 1 mode to the TE 0 mode at the wavelengths of 1310 and 1550 nm. Inset: wavelength dependence of the mode conversion loss at L tp 3 = 200 μm and W g = 0.16 μm . (c) and (d) Simulated electric field intensity distributions in the counter-tapered coupler as the TE 1 mode launched at the wavelengths of 1310 and 1550 nm, respectively. W 7 = 0.45 μm .
Fig. 5. (a) Wavelength dependence of the PRS performance in terms of the IL and CT for different launched modes. (b)–(g) Simulated electric field intensity distributions in our proposed PRS as the TE 0 mode and TM 0 mode launched at the wavelengths of 1310, 1490, and 1550 nm.
Table1. Parameters and Corresponding Values of the Proposed Device
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Xin Chen, Chao Qiu, Zhen Sheng, Aimin Wu, Haiyang Huang, Yingxuan Zhao, Wei Li, Xi Wang, Shichang Zou, Fuwan Gan. Design of an ultra-broadband and fabrication-tolerant silicon polarization rotator splitter with SiO2 top cladding[J]. Chinese Optics Letters, 2016, 14(8): 081301.