Correcting for spatial-resolution degradation mechanisms in OFDR via inline auxiliary points

Area of Science:

• Optoelectronics
• Optical Sensing
• Fiber Optics

Background:

• Optical Frequency Domain Reflectometry (OFDR) is crucial for high-resolution sensing.
• OFDR's spatial resolution is typically limited by laser phase noise, nonlinear frequency scans, and acoustic noise.
• Existing compensation methods often require complex auxiliary interferometers.

Purpose of the Study:

• To present a novel method for enhancing OFDR spatial resolution.
• To mitigate degradation from laser phase noise, scan nonlinearities, and acoustic noise.
• To achieve this without an auxiliary interferometer.

Main Methods:

• Implementation of inline auxiliary points with known impulse reflectivities.
• Utilizing the responses of these auxiliary points for phase deviation compensation.
• Experimental demonstration of the proposed compensation technique.

Main Results:

• Successful mitigation of spatial resolution degradation mechanisms in OFDR.
• Demonstrated compensation for phase deviations affecting distant measurement points.
• Validation of the inline auxiliary point method through experimentation.

Conclusions:

• The proposed method effectively enhances OFDR spatial resolution.
• Inline auxiliary points offer a practical solution for OFDR performance improvement.
• This technique eliminates the need for external auxiliary interferometers.