Frequency-division-multiplexed polarimetric fiber laser current-sensor array

Area of Science:

• Optoelectronics
• Sensor Technology
• Applied Physics

Background:

• Fiber optic sensors offer non-intrusive measurement capabilities.
• Polarimetric fiber lasers are sensitive to external perturbations like electric current.
• Multiplexing techniques are crucial for deploying multiple sensors in a single system.

Purpose of the Study:

• To introduce a novel frequency-domain-multiplexing technique for polarimetric fiber laser current sensors.
• To enable simultaneous and independent operation of multiple fiber laser current sensors.
• To simplify signal processing for distributed current sensing applications.

Main Methods:

• Utilizing frequency-domain multiplexing where each sensor operates at a unique polarization-mode beat frequency.
• Modulating the beat frequency in response to the applied electric current.
• Employing a bank of bandpass filters for signal separation.
• Implementing a phase-locked loop for frequency demodulation and signal processing.

Main Results:

• Demonstration of a functional frequency-domain-multiplexing technique for fiber laser current sensors.
• Successful separation and processing of signals from multiple independent sensors.
• The system shows potential for accurate electric current monitoring.

Conclusions:

• The proposed frequency-domain-multiplexing technique is effective for implementing multi-sensor polarimetric fiber laser current sensing systems.
• The use of unique beat frequencies and phase-locked loop demodulation simplifies sensor network design and signal analysis.
• This approach offers a promising solution for advanced electrical current monitoring.