光学
宽带
材料科学
时域有限差分法
硅
耦合模理论
带宽(计算)
光电子学
平衡模分布
单模光纤
物理
计算机科学
折射率
光纤
辐射模式
电信
作者
Mengjia Lu,Chunyu Deng,Yu Sun,Dongyu Wang,Lei Huang,Pengcheng Liu,Dongdong Lin,Wei Cheng,Guohua Hu,Tong Lin,Binfeng Yun,Yiping Cui
出处
期刊:Optics Express
[The Optical Society]
日期:2022-06-14
卷期号:30 (14): 24655-24655
被引量:11
摘要
A compact and broadband silicon mode-order converter (MOC) scheme by employing reciprocal mode evolution between asymmetric input/output taper and bricked subwavelength gratings (BSWG) is proposed. In the proposed MOC, a quasi-TE0 mode is generated in the BSWG region, which can be regarded as an effective bridge between the two TE modes to be converted. Flexible mode conversion can be realized by only choosing appropriate structure parameters for specific mode transitions between input/output modes and the quasi-TE0 mode. By combing 3D finite difference time domain (FDTD) and particle swarm optimization (PSO) method, TE0-TE1 and TE0-TE2 MOCs are optimal designed, which can efficiently convert TE0 mode to TE1 and TE2 modes with lengths of 9.39 µm and 11.27 µm, respectively. Results show that the insertion losses of <1 dB and crosstalk of <-15 dB are achieved for both TE0-TE1 and TE0-TE2 MOCs, the corresponding working bandwidth are 128 nm (1511∼1639 nm) and 126 nm (1527∼1653 nm), respectively. Additionally, the MOCs can be fabricated with only single etch step with minimum feature size of 145 nm.
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