研究目的
To propose a novel and highly efficient multimode waveguide grating coupler for launching four channels including two polarizations of the LP modes, LP01 and LP11, into a step-index few-mode fiber (FMF) for space-division-multiplexing (SDM) networks.
研究成果
The proposed mode multiplexer is entirely passive and capable of excitations of the LP01-x, LP01-y, LP11-x, and LP11-y modes in a step index FMF. Experimental coupling efficiencies of ?4.9 dB and ?6.1 dB were demonstrated respectively for two polarizations of the LP01 mode and the LP11 mode, making it suitable for future high-speed communication applications with FMFs in SDM networks.
研究不足
The experimental performance showed slight discrepancies with simulation results, including a red wavelength shift and a narrower 3-dB optical bandwidth, due to fabrication variations.
1：Experimental Design and Method Selection:
The design utilizes a subwavelength structure on the silicon-on-insulator (SOI) platform, optimized using genetic optimization with 2-D FDTD simulations and second-order EMT.
2：Sample Selection and Data Sources:
The design was fabricated in a multi-project wafer (MPW) run for silicon photonics.
3：List of Experimental Equipment and Materials:
SOI wafer with a 220-nm-thick top silicon layer and a 2-μm-thick buried-oxide layer, OFS two-mode step-index FMF.
4：Experimental Procedures and Operational Workflow:
The coupling efficiency was characterized by measuring the fiber-waveguide-fiber insertion loss with a SSMF as the input and a step-index two-mode FMF as the output.
5：Data Analysis Methods:
Performance was analyzed using 3-D FDTD simulation and experimental measurements.
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