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Dispersion spectroscopy with optical frequency comb-based single-shot dual-heterodyne mixing
Applied Optics
|December 25, 2019
Summary
This study introduces a new high-speed dispersion spectroscopy method for wide dynamic range measurements. The novel technique achieves precise parallel phase measurements in just 1 millisecond.
Area of Science:
- Optical Spectroscopy
- Photonics Engineering
Background:
- Dispersion spectroscopy is crucial for characterizing optical fibers.
- Existing methods often face limitations in speed and dynamic range.
Purpose of the Study:
- To develop a high-speed, wide dynamic range dispersion spectroscopy system.
- To enable parallel phase measurements for enhanced accuracy.
Main Methods:
- Utilized scanless dual-heterodyne mixing with 50 and 1.4 GHz frequency intervals.
- Employed an optical frequency comb and intensity modulator for adjacent frequency generation.
- Used arrayed waveguide grating for sideband separation.
Main Results:
- Achieved a 26 nm dispersion spectrum measurement.
- Demonstrated a wide measurement range of 1785 ps/nm.
- Obtained a low measurement uncertainty of 0.27 ps/nm.
- Completed measurements in 1 ms.
Conclusions:
- The novel approach offers a significant advancement in high-speed dispersion spectroscopy.
- The system's wide dynamic range and speed are suitable for demanding fiber optic applications.
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