研究目的
To propose and experimentally demonstrate a wideband and continuously tunable microwave photonic phase shifter based on an active InP/InGaAsP microring resonator incorporating two semiconductor optical amplifiers and a phase modulator.
研究成果
A continuously tunable microwave phase shift over a phase tuning range of 291° from 5 GHz to 20 GHz by tuning the injection current to the PM was implemented with a microwave power variation lower than 5 dB. The proposed MWP phase shifter is simple and can be expected to be fully integrated on a chip, making it suitable for integrated systems and practical microwave applications.
研究不足
The bandwidth of the proposed MWP phase shifter is mainly limited by the free spectral range of the MRR. The microwave power variation during phase shifting can be attributed to the noise of the SOA and thermal noise in the chip.
1：Experimental Design and Method Selection:
The experiment involves designing an add-drop type InP/InGaAsP-based MRR with integrated SOAs and a PM to achieve a tunable microwave phase shifter. The theoretical analysis is performed using the transfer matrix method.
2：Sample Selection and Data Sources:
The MRR is fabricated based on the InP/InGaAsP material system. The transmission response of the MRR is characterized using an optical vector network analyzer.
3：List of Experimental Equipment and Materials:
The setup includes a tunable laser source, a vector network analyzer, an erbium-doped fiber amplifier, a tunable bandpass optical filter, and a polarization controller.
4：Experimental Procedures and Operational Workflow:
The optical carrier is modulated by a microwave signal, amplified, filtered to get an optical single-sideband signal, and then coupled into the MRR. The output is detected by a photodetector and analyzed for intensity and phase.
5：Data Analysis Methods:
The phase and magnitude responses are analyzed to evaluate the performance of the phase shifter.
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