研究目的
Design of a four-branch optical power splitter using III-nitride semiconductors with MMI structure and taper output branches for optical communication applications.
研究成果
The designed optical power splitter achieves low excess loss (0.27 dB) and imbalance (0.12 dB) with uniform power distribution across four outputs. It is suitable for the C band range (1530-1565 nm) in optical communications, demonstrating potential for future device applications in III-nitride technology.
研究不足
The design is based on numerical simulation and may not account for all fabrication imperfections; tolerance for MMI width is limited to ±1 μm, which could be challenging in practical manufacturing.
1：Experimental Design and Method Selection:
The design is based on a rib waveguide, a rectangular MMI structure, and four taper waveguides. The finite difference beam propagation method (FD-BPM) is used for numerical simulation to model light propagation and optimize the structure.
2：Sample Selection and Data Sources:
The parameters for modeling are derived from previous work, including a 300 nm AlN buffer layer and 200 nm AlGaN on sapphire substrate. Refractive indexes are nTE =
3：279 ±001 and nTM=316± 001 for GaN/AlGaN. List of Experimental Equipment and Materials:
OptiBPM software is used for simulations. Materials include III-nitride semiconductors (GaN, AlN, AlGaN) on a sapphire substrate.
4：Experimental Procedures and Operational Workflow:
The numerical experiment is conducted in stages: first, optimize the width and length of the MMI structure using 3D FD-BPM for TE polarization at a wavelength of 1.55 μm; then integrate taper branches and simulate the optical field distribution, excess loss, imbalance, and wavelength dependence.
5：55 μm; then integrate taper branches and simulate the optical field distribution, excess loss, imbalance, and wavelength dependence. Data Analysis Methods:
5. Data Analysis Methods: Excess loss and imbalance are calculated using defined equations; results are analyzed for performance metrics and tolerance.
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