Adiabaticity Engineered Silicon Coupler With Design-Intended Splitting Ratio
oleh: Chih-Hsien Chen, Yu-Fang Lo, Guan-Xun Lu, Yung-Jr Hung, Shuo-Yen Tseng
| Format: | Article |
|---|---|
| Diterbitkan: | IEEE 2024-01-01 |
Deskripsi
We design and experimentally demonstrate compact and robust adiabaticity engineered couplers (AECs) with design intended splitting ratios (SRs) for the silicon-on-insulator platform. Adiabatic couplers (ACs) with variable SRs can be designed by output waveguide width-differences. By analyzing the mode-evolution region of ACs, we redistribute the adiabaticity parameter by engineering the taper function to obtain fast quasiadiabatic evolution, thus reducing the device footprints. AECs with design-intended SRs exhibit broad bandwidth and robustness against fabrication variations. We experimentally demonstrate compact AECs with average SRs of 22%/78% and 15%/85% with mode-evolution lengths of 42 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m and 25 <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m over a bandwidth of 70 nm, i.e., from 1500 to 1570 for the fundamental transverse electric (TE) mode.