Efficient Dual-Mode Fiber-Chip Edge Coupler Using an Adiabatic Mode Evolution Trident

We propose and demonstrate a silicon based dualmode fiber-chip edge coupler. By utilizing an adiabatic mode evolution trident structure combined with triple inverse tapers, efficient TE0-LP01 and TE1-LP11 mode coupling with low loss, low crosstalk and compact footprint could be achieved simultaneously. Design details and the corresponding simulation results are presented. Experimental results show insertion losses for TE0-LP01 and TE1-LP11 mode coupling are 9.78 dB and 7.82 dB, while crosstalk are -13.9 dB and -22.5 dB within 1520-1580 nm. Total length of the fabricated device is similar to 220 mu m. The proposed dual-mode coupler could be utilized in the interconnection of multi-mode fiber-chip transmission networks.

Automated summary

This study proposes and demonstrates a silicon-based dual-mode fiber-chip edge coupler, which achieves efficient mode coupling with low loss, low crosstalk, and compact footprint. The experimental results confirm the performance and feasibility of the proposed coupler.