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Wideband and low-error microwave frequency measurement using degenerate four-wave mixing-based nonlinear
Optics Letters
|April 2, 2019
Summary
We developed a photonic instantaneous frequency measurement (IFM) system using nonlinear interferometry for wideband microwave signal analysis. This system achieves a 40 GHz bandwidth with only 0.4% error, enhancing accuracy and practicality.
Area of Science:
- Photonics
- Nonlinear Optics
- Microwave Engineering
Background:
- Accurate and wideband instantaneous frequency measurement (IFM) is critical for modern electronic warfare and communication systems.
- Existing IFM systems often face limitations in bandwidth, accuracy, or practicality.
Purpose of the Study:
- To report a novel photonic instantaneous frequency measurement (IFM) system.
- To achieve wideband measurement with high accuracy and practicality for microwave signals.
Main Methods:
- Utilized a nonlinear interferometer with cascaded degenerate four-wave mixing (FWM).
- Introduced a tunable time delay using in-between dispersion.
- Interpreted microwave frequency via interference of two idlers generated in cascaded FWM stages.
Main Results:
- Achieved a wide measurement bandwidth of 40 GHz.
- Demonstrated a low measurement error of approximately 0.4%.
- Enabled parallel implementation of multiple IFMs without idler wavelength overlap.
Conclusions:
- The proposed photonic IFM system offers a practical solution for wide frequency coverage and high accuracy.
- The use of cascaded FWM and tunable time delay is effective for precise microwave frequency measurement.
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