研究目的
Designing and analyzing a novel, compact, on-chip spectrometer that combines the advantages of Echelle gratings (EG) and arrayed waveguide gratings (AWGs) to achieve superior performance in terms of spectral range, resolution, and cross talk.
研究成果
The innovative combination of EG with multiple AWGs in the proposed on-chip spectrometer design achieves both large bandwidth and high resolution, offering a compact, flexible, and cost-effective solution for spectroscopic applications. The design is compatible with PIC foundry processes, facilitating easy fabrication and integration into various applications.
研究不足
The design's efficiency and performance are subject to the limitations of the fabrication process and the inherent trade-offs between the operational bandwidth and resolution of EGs and AWGs.
1：Experimental Design and Method Selection:
The design combines an Echelle grating (EG) and multiple arrayed waveguide gratings (AWGs) in a cascaded layout to leverage their respective advantages. The EG is designed for maximum efficiency with an additional coating layer for higher intensity diffraction, while the AWG is optimized for a flat-top response for spectral uniformity.
2：Sample Selection and Data Sources:
The device operates in the spectral range of 1050 nm -1250 nm, with simulations performed for discrete wavelengths within this range.
3：List of Experimental Equipment and Materials:
The design includes components compatible with photonic integrated circuit (PIC) foundry processes, with simulations performed using BeamPROP of RSoftTM and finite difference time domain (FDTD) simulation tools.
4：Experimental Procedures and Operational Workflow:
Light is propagated through a single mode polarization maintaining waveguide, with polarization controlled by a splitter and rotator. The input light is separated into bands by the EG, each fed into an AWG designed for that specific band.
5：Data Analysis Methods:
The performance is evaluated based on resolution, cross talk, and output channels, with simulations providing interference patterns and transmission spectra.
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