研究目的
To realize ultra-low loss arbitrary-ratio multimode interference (MMI) splitters for applications like nanophotonic phased arrays by using tilted tapers to reduce excess loss.
研究成果
The use of tilted tapers minimizes excess loss in asymmetric 1×2 MMI power splitters, with predicted minimum loss of 0.05dB and maximum no more than 0.215dB, making it suitable for compact, ultra-low loss applications like nanophotonic optical phased arrays.
研究不足
The excess loss fluctuates due to variations in mode position distribution at different L and Lr, and the design may require separate optimization of output angles, taper size, and position for overall lower loss.
1：Experimental Design and Method Selection:
The design involves asymmetric 1×2 MMI power splitters with tilted output tapers to minimize excess loss. Simulations are conducted based on a silicon-on-insulator (SOI) platform with SiO2 cladding.
2：Sample Selection and Data Sources:
Simulations are performed for various splitting ratios by varying the multimode region length L and the removed rectangle length Lr.
3：List of Experimental Equipment and Materials:
SOI platform with SiO2 cladding, waveguides of width 450nm.
4：Experimental Procedures and Operational Workflow:
Simulate the relationship between Lr and L, calculate output angles, and optimize taper angles (θ1 and θ2 set to 2°) to reduce excess loss.
5：Data Analysis Methods:
Analysis of excess loss versus splitting ratio, with parameters like Lgap (e.g., 180nm and 200nm) considered.
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