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Phase-coded Brillouin optical correlation domain analysis with 2-mm resolution based on phase-shift keying.

Dexin Ba, Yue Li, Jialiang Yan

|December 25, 2019

Summary

This study introduces phase-shift keying (PSK) for phase-coded Brillouin optical correlation-domain analysis (BOCDA). This method achieves precise phase switching, improving sensing resolution and suppressing unwanted amplification.

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Area of Science:

Optics and Photonics
Sensing Technologies
Signal Processing

Background:

Brillouin optical correlation-domain analysis (BOCDA) is a high-resolution sensing technique.
Conventional phase-coded BOCDA faces limitations due to non-ideal phase transitions.

Purpose of the Study:

To develop a novel phase-coded BOCDA system using phase-shift keying (PSK).
To overcome the limitations of traditional phase modulation in BOCDA.

Main Methods:

Implementation of pseudo-random binary sequence (PRBS) phase coding using a Mach-Zehnder modulator (MZM).
Utilizing PSK for precise phase switching (0 and π) with zero-width edges.
Conducting numerical simulations and experimental validation.

Main Results:

Demonstrated effective suppression of Brillouin amplification at off-peak positions.
Achieved a spatial resolution of 2 mm using a 20-GHz bandwidth MZM.
Showcased robustness against modulator bandwidth and modulation signal power variations.

Conclusions:

PSK-based phase-coded BOCDA offers superior performance compared to conventional methods.
The developed technique enables high-resolution sensing with improved signal fidelity.
This advancement holds potential for various distributed sensing applications.