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High sensitivity microwave phase noise analyzer based on a phase locked optoelectronic oscillator
Optics Express
|June 30, 2019
Summary
This study introduces a novel microwave phase noise analyzer using a photonic-based reference, achieving high sensitivity for microwave oscillators. This advancement overcomes limitations in precisely characterizing high-frequency carriers, crucial for many applications.
Area of Science:
- Microwave engineering
- Optical physics
- Signal processing
Background:
- Phase noise is critical for microwave oscillator short-term stability, impacting various applications.
- Existing phase noise measurement techniques face challenges with high-frequency carriers due to reference signal limitations.
Purpose of the Study:
- To develop a high-sensitivity microwave phase noise analyzer.
- To overcome the limitations of conventional phase noise characterization for high-frequency signals.
Main Methods:
- Proposed a phase noise analyzer utilizing a photonic-based reference, combining an optoelectronic oscillator (OEO) and a direct digital synthesizer.
- Achieved a frequency-tunable reference (9-11 GHz) with low phase noise (-140 dBc/Hz at 10 kHz offset).
Main Results:
- Attained an X-band phase noise analyzer with -139 dBc/Hz sensitivity at 10 kHz offset without cross-correlation.
- Demonstrated the first phase noise analyzer based on a phase-locked loop (PLL) and an OEO.
Conclusions:
- The proposed photonic-based analyzer offers high sensitivity for microwave phase noise measurement.
- The OEO's frequency-independent phase noise characteristic enables extension to millimeter-wave frequencies while maintaining high sensitivity.
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