研究目的
To develop and demonstrate a Silicon-on-Insulator (SOI) based flexible filtering element with wide bandwidth tunability and full free spectral range (FSR) tuning for elastic optical networks.
研究成果
The proposed SOI-based filtering element achieves wide bandwidth tunability (9-103 GHz) and full FSR tuning with low power consumption and simple control. Experimental results align well with simulations, demonstrating its potential for elastic optical networks. Future work includes reducing thermal crosstalk and optimizing FSR and extinction ratio.
研究不足
Thermal crosstalk effects were observed at higher power levels, affecting MZI performance. The device may require optimization for narrower bandwidths below 9 GHz and further reduction of insertion loss variations.
1：Experimental Design and Method Selection:
The study involves designing a filtering element using two serially coupled micro ring resonators with three thermo-optically tuned Mach-Zehnder interferometers (MZIs) as variable optical couplers. Simulation analysis using ASPIC simulation package was conducted to investigate phase offset effects on spectral behavior. Experimental evaluation was performed to verify simulation results.
2：Sample Selection and Data Sources:
Fabricated SOI chips were used, produced by AMO GmbH. Measurements were taken using an Erbium Doped Fiber Amplifier (EDFA) for ASE noise input and a Continuous Wave (CW) laser source for extinction ratio measurements.
3：List of Experimental Equipment and Materials:
Equipment includes EDFA, OSA, power meter, DC probe tip, polarization controller, fiber-array assembly, and probe station. Materials include SOI wafer with 220 nm top-Si layer, 3 μm BOX layer, HSQ resist, SiO2 cladding, Si3N4 layer, titanium and aluminum electrodes.
4：Experimental Procedures and Operational Workflow:
The filtering element was characterized on a probe station using fiber-array coupling. Bandwidth tunability was achieved by controlling electrodes (yellow for bandwidth, blue for wavelength tuning). Measurements involved recording spectral responses and extinction ratios with varying control signals.
5：Data Analysis Methods:
Data analysis included calculating extinction ratio, center wavelength shift, and shape factor from measured spectral responses, comparing with simulation results.
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Erbium Doped Fiber Amplifier
Amplifying input signals for experimental evaluation
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Optical Spectrum Analyzer
Recording spectral responses of the filtering element
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Power Meter
Measuring power levels during experiments
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Polarization Controller
Ensuring TE-polarization state of light
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Fiber-Array Assembly
16× Single Mode Fiber channels
Coupling light in and out of the SOI chip
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DC Probe Tip
Providing electrical access to heating wires for thermo-optic control
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SOI Wafer
AMO GmbH
Substrate for fabricating the filtering element
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