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针对成品相移光栅反射谱中透射窗口位置的不可调谐性,提出了一种由单模光纤谐振环和普通布拉格光栅组成的新型器件。利用信号流程图的方法,详细分析了该器件的工作原理,给出了该器件的反射输出表达式,并推导了该器件的精细度和半峰全宽的表达式,利用Matlab进行了数值模拟。结果发现光栅辅助的光纤谐振环的反射谱具有相移光栅反射谱的特点,并且该器件反射谱中透射窗口的深度和位置还具有可调谐性。最后,分析了光纤谐振环参数对该器件反射谱的半峰全宽和精细度的影响,为进一步提高该器件作为窄线宽单频光纤激光器选频元件的性能提供了理论依据。
Aiming at the non-tunability of the transmission window position in the reflection spectrum of the finished phase shift grating, a novel device consisting of a single mode fiber resonator and an ordinary Bragg grating is proposed. The working principle of the device is analyzed in detail by using the signal flow diagram. The expression of the reflected output of the device is given, and the expression of the fineness and full width at half maximum of the device is derived. The numerical simulation . The results show that the reflection spectrum of grating-assisted fiber ring has the characteristic of phase-shift grating reflection spectrum, and the depth and position of the transmission window in the reflection spectrum of the device are also tunable. Finally, the influence of the parameters of the fiber ring resonator on the full width at half maximum of the reflection spectrum of the device is analyzed, providing a theoretical basis for further improving the performance of the device as a frequency selective element of a narrow linewidth single frequency fiber laser.