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研究了多通道自混合干涉时的环路中光谱的特性以及温度对自混合干涉效应的影响。用光纤激光器和阵列波导光栅搭建多通道自混合干涉系统,用光谱分析仪监测环路中的光谱特性。实验结果显示:环路中无光反馈时,其光谱是多个峰值,各峰值与阵列波导光栅通道特性对应,其包络与掺饵光纤激光器的自由增益谱吻合;有光反馈时,该通道光强减弱,多个通道同时引入光反馈时,光路中能量泄露到其他增益较高的通道,形成尖锋;当靶面距离光纤端面较近时,形成强反馈,该通道中会产生自激现象;当环境温度较高时,与AWG对应的各通道都能形成明显的波峰和波谷,温度较低时,波长较短部分波形较平坦,不适合作为传感通道。证明了多通道自混合干涉系统用于传感网络是可行的。
The characteristics of the spectrum in the loop with multi-channel self-mixing interference and the effect of temperature on the self-mixing interference effect are studied. A multi-channel self-mixing interference system is constructed by using a fiber laser and an arrayed waveguide grating, and the spectral characteristics in the loop are monitored by a spectrum analyzer. The experimental results show that the spectrum has multiple peaks when there is no light feedback in the loop, and each peak corresponds to the channel characteristics of the arrayed waveguide grating. The envelope of the spectrum matches the free gain spectrum of the erbium-doped fiber laser. When there is optical feedback, Light intensity is weakened. When multiple channels are introduced into the optical feedback at the same time, the energy in the optical path is leaked to other channels with higher gain to form a sharp front. When the target is closer to the end face of the optical fiber, a strong feedback is generated, and self-excitation Phenomenon; when the ambient temperature is high, each channel corresponding to the AWG can form obvious peaks and troughs. When the temperature is lower, the waveform of the shorter wavelength is flatter, which is not suitable as the sensing channel. It is proved that multi-channel self-mixing interference system is suitable for sensing network.