研究目的
To design and demonstrate a silicon-based polarization-insensitive optical filter with a large bandwidth and low excess loss for both polarizations.
研究成果
The fabricated optical filter shows polarization-insensitive performances with large 3 dB-bandwidths of 11–12 nm, low losses of 0.6–1.5 dB, and high sidelobe suppression ratios of 17–23 dB for both polarizations. The 3 dB-bandwidth can be adjusted by modifying the corrugation depths.
研究不足
The 3 dB-bandwidth and excess loss may vary with fabrication tolerances and material properties.
1：Experimental Design and Method Selection:
The filter integrates a (de)multiplexer, a TE-type dual-polarization mode multimode waveguide grating (MWG) with triangular corrugations and a TM-type MWG with rectangular corrugations. Lateral-shift apodization is introduced for both types of MWG to suppress side-lobes. Grating-tapers between the grating section and input/output section are used to reduce undesired reflection loss.
2：Sample Selection and Data Sources:
The device is fabricated on an SOI wafer with a 220 nm-thick top-silicon layer and a 2 μm thick buried-dioxide layer.
3：List of Experimental Equipment and Materials:
Scanning electron microscopic (SEM) images are used for characterization.
4：Experimental Procedures and Operational Workflow:
The spectral responses at the drop port are measured for TE and TM polarizations.
5：Data Analysis Methods:
The transmissions of the straight waveguides with TE- or TM-type grating couplers are used for normalization.
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