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提出了一种采用F-P光纤环滤波器的窄线宽环形腔激光器,该激光器采用环形腔结构,两个耦合比为30:70的耦合器和一段2 m长的未泵浦掺铒光纤构成F-P光纤环滤波器,F-P光纤环滤波器产生的梳状谱,可以增大激光模式之间的自由光谱范围(FSR),在一定程度上减小跳模现象的发生,有利于模式的稳定。研究表明,通过对掺铒光纤的优化和耦合器的选择可以提高F-P光纤环滤波器的精细度,而F-P光纤环中的未泵浦掺铒光纤起到饱和吸收体的作用,使输出激光的线宽得到有效压缩。将保偏光纤光栅和F-P光纤环滤波器共同应用于环形腔掺铒光纤激光器,在室温下得到了3 dB线宽均小于0.07 nm(实验室光谱仪最小分辨率)的窄线宽双波长输出。在2 h的观测时间内,最大峰值功率波动小于0.4 dB,具有良好的稳定性。
A narrow linewidth ring cavity laser using a FP fiber loop filter is proposed. The laser uses a circular cavity structure, two couplers with a coupling ratio of 30:70 and a 2m long un-pump erbium-doped fiber to form an FP The comb spectrum produced by the fiber ring filter and the FP fiber ring filter can increase the free spectral range (FSR) between the laser modes and reduce the mode jumping phenomenon to a certain extent, which is in favor of the mode stability. The research shows that by optimizing the erbium-doped fiber and the coupler, the precision of the FP fiber loop filter can be improved. However, the un-pumped erbium-doped fiber in the FP fiber loop acts as a saturable absorber, Linewidth is effectively compressed. The polarization-maintaining fiber grating and the F-P fiber loop filter are applied to the ring-cavity erbium-doped fiber laser and the narrow linewidth dual wavelength output with 3 dB linewidth less than 0.07 nm (minimum resolution of laboratory spectrometer) is obtained at room temperature. During the observation time of 2 h, the maximum peak power fluctuation is less than 0.4 dB, with good stability.