Magneto-optic current sensor using a helical-fiber Fabry-Perot resonator.

Area of Science:

• Optoelectronics
• Fiber Optics
• Sensor Technology

Background:

• Magneto-optic sensors are crucial for non-invasive current measurement.
• Traditional sensors face limitations in sensitivity and compactness.
• Fabry-Perot resonators offer potential for enhanced optical sensing.

Purpose of the Study:

• To introduce a compact magneto-optic current sensor utilizing a helical fiber-optic Fabry-Perot resonator.
• To investigate the impact of helical geometry on sensor performance.
• To quantify the sensitivity enhancement achieved by the resonator's finesse.

Main Methods:

• Designing a single-turn helical fiber-optic Fabry-Perot resonator.
• Integrating the resonator into a magneto-optic current sensor configuration.
• Conducting experimental measurements to compare sensitivity with single-pass sensors.

Main Results:

• The helical shape enables a compact sensor with necessary polarization properties.
• Resonator finesse significantly increases sensor sensitivity.
• Experimental validation shows a fourfold sensitivity increase for a finesse of F=6 compared to single-pass sensors.

Conclusions:

• The helical fiber-optic Fabry-Perot resonator is a promising approach for high-sensitivity, compact current sensing.
• The resonator's finesse is a key factor in achieving enhanced magneto-optic sensing performance.
• This technology offers a significant improvement over existing single-pass sensor designs.