研究目的
Investigating the use of a doubly resonant short cavity Brillouin ring-laser with a wavelength locking system as a low-RIN pump-probe source for Brillouin optical time-domain analysis (BOTDA) sensing, and comparing its performance to a long-cavity ring laser for enhanced temperature-strain resolutions.
研究成果
The wavelength locked DR-SC BRL significantly reduces the relative intensity noise (RIN) compared to the LC-BRL, offering a potential improvement in temperature and strain resolutions by up to a factor of 3.7 in BOTDA applications. This advancement could benefit longer sensing ranges and higher accuracy measurements.
研究不足
The study focuses on the comparison between short and long cavity Brillouin ring lasers and their impact on BOTDA sensing performance. Potential areas for optimization include further reducing intensity noise and enhancing the stability of the wavelength locking system.
1：Experimental Design and Method Selection:
The study employs a doubly resonant short cavity Brillouin ring-laser (DR-SC BRL) with a wavelength locking system for BOTDA sensing. The method involves comparing the performance of this laser scheme with a long-cavity ring laser (LC-BRL).
2：Sample Selection and Data Sources:
The sensing fiber used is composed of several spools of single mode fibers with different Brillouin Frequency Shift (BFS) values to simulate varying strain/temperature conditions.
3：List of Experimental Equipment and Materials:
Equipment includes a DFB seed laser, EDFA, EOM, fast photodetector, and ESA for analysis.
4：Experimental Procedures and Operational Workflow:
The procedure involves generating pump and probe signals, injecting them into the sensing fiber, and analyzing the Brillouin gain spectrum and frequency shift to assess performance.
5：Data Analysis Methods:
Data analysis includes evaluating the stability of outputs in terms of intensity noise (RIN) and calculating the signal-to-noise ratio (SNR) to estimate resolution improvements.
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