研究目的
Investigating the suppression of second-order distortions (SDs) in wideband multi-octave phase-shifting photonic links and proposing an all-optical microwave phase shifter that supports amplitude tuning of the fundamental signals.
研究成果
The proposed all-optical multi-octave microwave phase shifter with 360° phase shift is verified by simulations. The phase and amplitude of the output fundamental signals can be independently continuously tuned. The SDs are well suppressed by differential detection, improving the SFDR of the phase shifter. The proposed phase shifter can be expanded to multiple independent phase shifting channels suitable for phased array beamforming and microwave filters.
研究不足
The polarization stability of the proposed phase shifter can be improved if electronically controlled PCs or photonic integration are used. The minimum operating frequency is affected by the edge roll-off factor of the WDM.
1：Experimental Design and Method Selection:
The proposed all-optical microwave phase shifter is based on polarization modulation and differential detection. The phase and amplitude of the output fundamental signals are tuned by manipulating the polarization states of the optical signals. SDs components with same frequencies cancel out each other through differential detection.
2：Sample Selection and Data Sources:
Simulation is set up using the commercial software VPIphotonics. The TLS has a frequency of 193.1 THz, a line width of 500 kHz, an output power of 10 dBm, and a relative intensity noise (RIN) of -160 dBm/Hz.
3：1 THz, a line width of 500 kHz, an output power of 10 dBm, and a relative intensity noise (RIN) of -160 dBm/Hz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: TLS, three PCs, a PolM, an EDFA, a dual channel WDM, two Pols, and a BPD.
4：Experimental Procedures and Operational Workflow:
The optical fields at the output of the PolM along its two principal axes are written and analyzed. The orthogonally polarized DSB signal is amplified by an EDFA and then split into two SSB signals by a WDM. The two SSB signals are differentially detected by a BPD.
5：Data Analysis Methods:
The photocurrents recovered by PD1 and PD2 are analyzed to show the suppression of SDs and the tuning of the phase and amplitude of the fundamental signals.
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