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首页> 外文会议>RIAO/OPTILAS 2004 >Periodically switched erbium-doped fiber laser for enhanced temperature sensitivity in a fiber sensor
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Periodically switched erbium-doped fiber laser for enhanced temperature sensitivity in a fiber sensor

机译：周期性切换掺-光纤激光器，可增强光纤传感器的温度灵敏度

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摘要

When a pulse of light is launched down a single-mode optical fiber, with a peak power below the threshold for nonlinear effects, backscattered Rayleigh and spontaneous Brillouin signals are generated. The Brillouin signal is temperature sensitive while the Rayleigh signal shows comparatively negligible sensitivity but serves as a backscattered signature for fiber attenuation and loss mechanisms. Ratioing one signal to the other extracts the temperature information. Optical separation of the Rayleigh and Brillouin signals of our sensor requires a source with bandwidth less than 90pm. However, the narrowband Rayleigh signal generated is noisy due to coherent Rayleigh noise. A broader source generates a Rayleigh signal with reduced coherent Rayleigh noise. A Q-switched erbium-doped fiber-optic laser containing a fiber-optic switch in the laser cavity, which allows switching and selection of a narrow ( < 90pm) or broad (～3nm) bandwidth output coupler has been developed. Periodic switching should allow virtually simultaneous capturing of Brillouin and broadband Rayleigh signals thus ensuring that the spontaneous Brillouin signal is correctly referenced even if fiber attenuation, splice or bend losses should vary during extended data collection cycles.
机译：当沿单模光纤发射光脉冲时，其峰值功率低于非线性效应的阈值，就会产生反向散射的瑞利信号和自发的布里渊信号。布里渊信号是温度敏感的，而瑞利信号显示出相对可忽略的敏感度，但充当光纤衰减和损耗机制的反向散射信号。将一个信号与另一个信号按比例提取温度信息。我们传感器的瑞利和布里渊信号的光学分离需要一个带宽小于90pm的光源。然而，由于相干瑞利噪声，所产生的窄带瑞利信号是有噪声的。较宽的源会产生具有降低的相干瑞利噪声的瑞利信号。现已开发出一种Q开关掺-光纤激光器，该激光器在激光腔中包含一个光纤开关，该光纤开关允许切换和选择窄带宽（<90pm）或宽带宽（〜3nm）的输出耦合器。周期性切换应允许几乎同时捕获布里渊信号和宽带瑞利信号，从而确保即使在延长的数据收集周期内光纤衰减，熔接或弯曲损耗发生变化时，也能正确参考自发的布里渊信号。

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