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Wavelength switching technique for phase interrogation of Mach Zehnder interferometer-based optical sensors
Optics Express
|January 5, 2024
Summary
A new method accurately measures Mach Zehnder interferometer phase shifts by switching laser wavelengths. This technique offers unambiguous, real-time measurements suitable for bio and medical sensing applications.
Area of Science:
- Optics and Photonics
- Interferometry
- Sensing Technology
Background:
- Mach Zehnder interferometers (MZIs) are crucial for various sensing applications.
- Accurate and unambiguous phase shift determination is essential for MZI-based sensing.
- Existing methods may have limitations in range, complexity, or applicability.
Purpose of the Study:
- To present a novel method for unambiguous phase shift determination in Mach Zehnder interferometers.
- To enable real-time, high-accuracy phase shift measurements.
- To provide a versatile method suitable for bio and medical sensing.
Main Methods:
- Utilizes wavelength switching of continuous wave (CW) laser light illuminating the MZI.
- Measures interferometer output amplitudes at both DC and the switching frequency.
- Employs simple detection without requiring sensor modification or laser electronics access.
Main Results:
- Demonstrates unambiguous measurement of MZI phase shift over the full 2π range.
- Achieves real-time measurement with high repeatability and accuracy.
- Accuracy is primarily limited by optical frequency drift and laser power fluctuations.
Conclusions:
- The presented method offers a robust and simple approach for MZI phase shift determination.
- Its suitability for bio and medical sensing is highlighted due to its non-invasive nature and simplicity.
- This technique advances the capabilities of MZI-based sensing platforms.
