研究目的
To realize forward mode conversion with flat-top bandpass spectrum based on two cascaded Bragg-reflection processes for use in WDM-MDM systems.
研究成果
The proposed scheme successfully demonstrates forward mode conversion with flat-top bandpass spectrum using cascaded Bragg gratings. It offers design flexibility and potential for high-performance mode converters in WDM-MDM systems, with future work needed to optimize bandwidth and fabrication processes.
研究不足
The experimental bandwidth is narrower (8.3 nm) compared to simulation (23 nm), potentially due to fabrication imperfections or grating length constraints. The scheme requires precise control of grating parameters and may have limitations in scalability or integration with other photonic components.
1：Experimental Design and Method Selection:
The study uses a scheme involving two cascaded Bragg gratings in a silicon-on-insulator (SOI) waveguide to achieve forward mode conversion. Simulation is performed using rigorous 3D finite-difference time-domain (FDTD) method, and experimental verification is conducted on fabricated devices.
2：Sample Selection and Data Sources:
The samples are fabricated waveguides on SOI platform supporting three TE modes (TE0, TE1, TE2). Data is collected from simulation outputs and experimental measurements using optical spectrum analysis.
3：2). Data is collected from simulation outputs and experimental measurements using optical spectrum analysis.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes e-beam lithography (EBL) system for fabrication, amplified spontaneous emission light source, optical spectrum analyzer, and fibers for coupling. Materials include silicon, silicon dioxide, PMMA film for grating patterning, and SOI wafers.
4：Experimental Procedures and Operational Workflow:
Fabricate waveguides and gratings using EBL and etching. Launch specific TE modes into the waveguide, measure transmitted spectra (Sij) using fibers connected to light source and spectrum analyzer. Analyze conversion spectra and mode profiles.
5：Data Analysis Methods:
Analyze transmission spectra to determine bandwidth and conversion efficiency. Use simulation data to validate experimental results and study mode field profiles.
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