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Writing Bragg Gratings in Multicore Fibers
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Experimental Demonstration of Low-Uncertainty Calibration Methods for Bragg Grating Interrogators
José Luis de Miguel1, Juan Galindo-Santos2, Concepción Pulido de Torres3
1Instituto de Óptica, CSIC, C/Serrano 121, 28006 Madrid, Spain. jl.demiguel@csic.es.
Sensors (Basel, Switzerland)
|June 13, 2018
Summary
We present two novel methods for precise calibration of fiber Bragg grating (FBG) interrogators. These techniques achieve low uncertainties, improving FBG sensor accuracy for various applications.
Area of Science:
- Optics and Photonics
- Metrology
- Fiber Optic Sensing
Background:
- Accurate calibration of fiber Bragg grating (FBG) interrogators is crucial for reliable sensor data.
- Existing calibration methods may have limitations in precision or applicability.
Purpose of the Study:
- To propose and demonstrate two alternative high-precision calibration methods for FBG interrogators.
- To compare the uncertainties and requirements of the proposed methods.
Main Methods:
- Method 1: Direct comparison with a calibrated wavemeter using a simulated FBG.
- Method 2: Measuring reference absorption lines from calibrated gas cells.
Main Results:
- Both methods successfully calibrated commercial FBG interrogators.
- Method 1 uncertainty is limited by tunable filter characteristics.
- Method 2 achieved lower uncertainties, limited by interrogator resolution and gas cell data.
Conclusions:
- The proposed methods offer viable alternatives for high-precision FBG interrogator calibration.
- Method 2 provides superior accuracy but requires more advanced interrogator software.
- Achieved uncertainties as low as 0.63 pm at 1550 nm demonstrate the effectiveness of the techniques.
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