论文部分内容阅读
研究了基于单纵模分布Bragg反射(DBR)光纤激光器的拍频解调传感技术,并对其组网技术进行了探讨。由于光纤本身的固有双折射,DBR光纤激光器能够产生两种正交偏振模式的激光,而这两种偏振模式的频率差拍会在射频域形成对温度变化极为敏感的拍频(beatfrequency)。实验结果表明:在20～100℃的温度范围内,激光器拍频随温度的增加呈线性减小,其线性拟合度高达0.99981,拍频灵敏度为0.51063MHz/℃。这种偏振式光纤激光器具有高输出功率、高信噪比、低解调成本和窄输出线宽等特点,有助于构建大规模的光纤有源传感网络。参考近年关于光纤传感网络的报道,提出一种有源光纤环形传感网络的构想。
The beat demodulation sensing technology based on single longitudinal mode distributed Bragg reflection (DBR) fiber laser is studied and its networking technology is discussed. Due to the inherent birefringence of the fiber itself, the DBR fiber laser produces two types of lasers in orthogonal polarization mode, and the frequency beat of both polarization modes creates a beatfrequency that is very sensitive to temperature changes in the radio frequency domain. The experimental results show that the laser beat frequency decreases linearly with the increase of temperature in the temperature range of 20 ~ 100 ℃, the linear fitting degree is up to 0.99981 and the beat frequency sensitivity is 0.51063MHz / ℃. This polarization fiber laser features high output power, high signal-to-noise ratio, low demodulation cost and narrow output line width to help build large-scale fiber optic active sensing networks. With reference to the recent reports on optical fiber sensing networks, a concept of active optical fiber ring sensing network is proposed.