研究目的
To design and demonstrate a monolithically integrated multi-channel silicon photonic receiver based on second-order microring resonators for high-speed optical interconnects, with improved crosstalk and shape factor.
研究成果
The demonstrated receiver achieves low crosstalk (< -30 dB), wide bandwidth (~50 GHz), and an aggregate data rate of 80 Gb/s at 10 Gb/s per channel, with successful thermal tuning. It shows potential for advanced optical interconnects, with recommendations for optimizing PD design and fabrication to reduce dark current and tuning power.
研究不足
High dark current in Ge photodetectors due to lattice mismatch and defects, high thermal tuning power consumption, and fabrication errors causing wavelength mismatches that require tuning.
1：Experimental Design and Method Selection:
The experiment involved designing and fabricating a multi-channel WDM receiver on an SOI platform using second-order MRR filters for demultiplexing and Ge-on-Si photodetectors for detection. Thermal tuning via integrated micro-heaters was used for wavelength adjustment.
2：Sample Selection and Data Sources:
Fabricated devices on a 200-mm SOI wafer with specific dimensions (2 μm buried oxide, 220 nm top c-Si layer) were used. Data was collected from optical transmission measurements and data transmission tests.
3：List of Experimental Equipment and Materials:
Equipment included an ASE broadband source, lensed fibers, a three-axis micro-positioning stage, an optical spectrum analyzer (OSA), a LiNbO3 modulator, a signal quality analyzer (Anritsu MP1800A), and a sampling oscilloscope (Agilent DCA 86100C). Materials included SOI wafers, TiN for micro-heaters, and Ge for photodetectors.
4：Experimental Procedures and Operational Workflow:
Light was coupled into the device using lensed fibers and a positioning stage. Transmission spectra were measured with the OSA after thermal tuning. Data transmission tests involved modulating light with PRBS signals, detecting with PDs, and observing eye diagrams with the oscilloscope.
5：Data Analysis Methods:
Spectra were normalized, and parameters like insertion loss, bandwidth, crosstalk, and shape factor were calculated. Eye diagrams were analyzed for data rate capability.
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