A continuous-wave tunable all-fiber optical parametric oscillator (FOPO) was demonstrated with a single-mode–multimode–single-mode (SMS) device used as wavelength selection filter. A highly nonlinear fiber (HNLF) was used to provide nonlinear gain, and two cascaded SMS fiber structures, having low insertion losses and containing multimode fibers of different lengths and core diameters, were used for effective wavelength selection. The maximum FOPO signal power was 0.5 W at 1642.5 nm, with 2 W of pump light incident on the HNLF end face. The power stability of the FOPO signal output was better than 0.2 dB over 30 min. A wavelength tuning range from 1642.5 to 1655.4 nm was realized by stretching a multimode fiber in the SMS device.

演示了一种连续波可调谐全光纤光学参量振荡器（FOPO），该器件具有用作波长选择滤波器的单模-多模-单模（SMS）器件。使用高度非线性的光纤（HNLF）提供非线性增益，并使用两个插入损耗低并且包含不同长度和纤芯直径的多模光纤的级联SMS光纤结构进行有效的波长选择。在1642.5 nm处，最大FOPO信号功率为0.5 W，其中2 W的泵浦光入射在HNLF端面上。FOPO信号输出在30分钟内的功率稳定性优于0.2 dB。通过在SMS装置中拉伸多模光纤，可以实现1642.5至1655.4 nm的波长调谐范围。