研究目的
To propose and analyze a novel photonic method for instantaneous microwave frequency measurement (IMFM) based on Stimulated Brillouin scattering (SBS) to achieve high resolution and wide frequency range.
研究成果
The proposed IMFM scheme based on SBS and ACF achieves a high resolution of 8 MHz and a wide frequency range of 23 GHz with a simple system structure, demonstrating feasibility and improvement over previous methods.
研究不足
The measurement range is limited by the bandwidth of instruments used, not by the system structure. Measurement accuracy depends on the amount of data used to construct the ACF curve; more data improve accuracy but may increase complexity.
1：Experimental Design and Method Selection:
The method utilizes SBS effect in highly nonlinear fiber (HNLF) to amplify or attenuate two adjacent frequency components, creating an amplitude comparison function (ACF) for frequency measurement. A vector network analyzer (VNA) is used to generate scanning microwave signals and detect outputs.
2：Sample Selection and Data Sources:
Unknown RF signals with frequencies ranging from 0.47 GHz to 23 GHz are used as inputs. Scanning signals are generated with specific frequency intervals.
3：47 GHz to 23 GHz are used as inputs. Scanning signals are generated with specific frequency intervals. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Laser diode (LD), phase modulator (PM), isolator (ISO), Mach-Zehnder modulator (MZM), erbium-doped fiber amplifier (EDFA), optical circulator (OC), highly nonlinear fiber (HNLF), photodetector (PD), vector network analyzer (VNA).
4：Experimental Procedures and Operational Workflow:
Light from LD is split; one path is phase-modulated with scanning signals, the other is modulated with the unknown RF signal to produce a double-sideband suppressed carrier (DSB-SC) signal, amplified by EDFA, and used as pump light in HNLF where SBS occurs. The output is detected by PD and analyzed by VNA.
5：Data Analysis Methods:
The ACF is calculated from the power ratios of two scanning signals, and the unknown frequency is determined using the inverse function of the ACF curve. Simulation and experimental data are compared for validation.
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Laser Diode
Used as the light source in the experimental setup.
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Phase Modulator
Modulates the light with scanning microwave signals.
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Isolator
Prevents residual pump power from the phase modulator.
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Mach-Zehnder Modulator
Modulates the light with the unknown RF signal to produce a double-sideband suppressed carrier signal.
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Erbium-Doped Fiber Amplifier
Amplifies the modulated signal.
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Optical Circulator
Routes the optical signals in the setup.
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Highly Nonlinear Fiber
Medium where stimulated Brillouin scattering occurs.
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Photodetector
Detects the optical signals and converts them to electrical signals.
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Vector Network Analyzer
Generates scanning microwave signals and analyzes the output signals.
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