研究目的
Investigating the capability of a new microwave photonic frequency divider to generate a microwave frequency component with a frequency of 1/n times the input microwave signal frequency.
研究成果
The microwave photonic 1/n frequency divider has been successfully demonstrated, capable of realizing 1/2 and 1/3 frequency division for a 20 GHz input microwave signal, with improved phase noise performance. The divider can find applications in photonic-assisted microwave frequency synthesis for ultra-low phase microwave signal generation.
研究不足
The operating frequency of the microwave photonic frequency divider is limited by the DPMZM bandwidth. The measurement bandwidth is limited to 17.5-20 GHz due to the bandwidth of the bandpass filter used in the experiment.
1：Experimental Design and Method Selection:
The system is implemented based on an optoelectronic oscillator (OEO) consisting mainly of a dual-parallel Mach Zehnder modulator for microwave signal modulation and an optical filter for sideband suppression.
2：Sample Selection and Data Sources:
A continuous-wave light from a laser source is launched into a dual-parallel Mach Zehnder modulator (DPMZM).
3：List of Experimental Equipment and Materials:
Includes a wavelength tunable laser source, DPMZM, EDFA, optical filter, photodetector, LNA, and microwave splitter.
4：Experimental Procedures and Operational Workflow:
The microwave modulated optical signal is amplified by an EDFA, followed by an optical filter before detection at a photodetector. The electrical signal at the output of the PD is amplified by an LNA and fed back to MZM2 inside the DPMZM.
5：Data Analysis Methods:
The phase noise of the generated signals is measured using an electrical spectrum analyzer.
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wavelength tunable laser source
N7711A
Keysight
Provides continuous-wave light for the experiment
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optical filter
BVF-300CL
Alnair Labs
Suppresses unwanted sidebands and the optical carrier
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low noise amplifier
SHF 806E
SHF
Amplifies the electrical signal
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electrical spectrum analyzer
N9020B
Keysight
Measures the electrical spectrum of the output signal
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Dual-parallel Mach Zehnder modulator
IQ-0D6V-35-PFA-PFA-LB
EOSpace
Modulates the microwave signal onto the optical carrier
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Erbium-doped fiber amplifier
EDFA-BA-20-B
Max-ray Photonics
Amplifies the optical signal
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photodetector
XPDV2120RA
U2t
Detects the optical signal and converts it to an electrical signal
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microwave signal generator
HMC-T2220
Hittite
Generates the input microwave signal
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