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将多波长激光光源技术引入瑞利布里渊光时域分析系统,其中抑制载波的微波调制多波长脉冲基底1阶边带会在传感光纤中产生多波长背向瑞利散射;将该散射光作为探测光与多波长传感脉冲发生受激布里渊散射(SBS)作用,可有效地提高光纤SBS阈值和SBS作用效率,进而提高系统信噪比和布里渊频移的测量精度。分析了相位调制器产生多波长激光光源的原理以及利用电光强度调制器产生作为探测光的多波长斯托克斯和反斯托克斯激励光的原理,建模分析了多波长瑞利布里渊光时域分析系统原理,给出了系统信噪比与波长数关系的表达式;搭建了单波长和三波长光纤SBS阈值测量系统及瑞利布里渊光时域分析系统,测量了光纤的SBS阈值和系统性能。实验结果表明,当单波长与三波长瑞利布里渊光时域分析系统的传感脉冲宽度为100ns,峰值功率为100mW,单个波长的脉冲基底功率约为1.3mW,传感光纤长度为2.4km时,三波长较单波长系统的光纤SBS阈值和信噪比分别提高了3倍和2.83倍,在2km光纤内布里渊频移波动由33.4 MHz降至15.6 MHz。
The multi-wavelength laser light source technology is introduced into the Rayleigh Brillouin optical time-domain analysis system, in which the first-order side band of the microwave modulated multi-wavelength pulse substrate restraining the carrier generates multi-wavelength back-facing Rayleigh scattering in the sensing fiber; Stimulated Brillouin scattering (SBS) as a probe light and multi-wavelength sensing pulse can effectively improve the SBS threshold and SBS efficiency of optical fiber, and improve the measurement accuracy of S / N ratio and Brillouin frequency shift. The principle of multi-wavelength laser light source generated by phase modulator and the principle of generating multi-wavelength Stokes and anti-Stokes excitation light as probe light using electro-optic intensity modulator are analyzed. The multi-wavelength Rayleighbury The principle of time-domain analysis of deep-light system is given, and the expressions of signal-to-noise ratio and wavelength number are given. Single-wavelength and three-wavelength optical SBS threshold measurement system and Rayleigh Brillouin optical time-domain analysis system are established. SBS threshold and system performance. The experimental results show that when single-wavelength and three-wavelength Rayleigh Brillouin optical time-domain analysis system has a sensing pulse width of 100ns and a peak power of 100mW, the pulse base power of a single wavelength is about 1.3mW and the sensing fiber length is 2.4 km, the optical fiber SBS threshold and signal-to-noise ratio of the three-wavelength single-wavelength system are respectively increased by 3 times and 2.83 times respectively. The fluctuation of the Brillouin frequency shift within the 2 km optical fiber is reduced from 33.4 MHz to 15.6 MHz.