Multiplexing of RF-assisted fiber ring resonators based on phase-shift amplification

Area of Science:

• Photonics
• Optical Sensing
• Resonator Technology

Background:

• Fiber ring resonators (FRRs) are crucial optical components.
• Multiplexing FRRs for sensing applications presents challenges, particularly crosstalk.
• Existing methods often require complex configurations or additional components.

Purpose of the Study:

• To propose and experimentally demonstrate a novel multiplexing scheme for fiber ring resonators (FRRs).
• To achieve crosstalk-free loss sensing by optimizing the multiplexing strategy.
• To verify the feasibility of independent demodulation for cascaded FRRs.

Main Methods:

• Theoretical analysis comparing parallel and series FRR configurations.
• Experimental implementation using an optical carrier-based microwave interferometry system.
• Analysis of frequency response properties at distinct radio frequency (RF) working points.

Main Results:

• Demonstrated independent demodulation of each FRR through phase-shift based demodulation at specific RF points.
• Achieved high sensitivity of transmittance (-0.341 rad) with robustness and immunity to power fluctuations.
• Virtually eliminated crosstalk between multiplexed FRRs using insensitive points and a series strategy.

Conclusions:

• The proposed series configuration for multiplexing FRRs effectively eliminates crosstalk in loss sensing.
• Independent demodulation of phase-based FRR sensors is achievable without additional cost.
• This innovative approach offers a promising solution for advanced optical sensing systems.