环境温度和激光器输出波长变化引起的光纤链路时延波动直接影响光纤时间传递的稳定性。采用链路分段处理方法推导了长距离光纤时间传递的稳定性与激光器输出波长及链路温度变化之间的关系；通过分析实测的激光器波长波动数据，建立了激光器波长波动模型。基于实际温度数据构造了3000 km 光纤链路，分析了波长波动和链路铺设深度等对双向时分复用(BTDM)和波分复用(WDM)光纤时间传递稳定性的影响。结果表明：光纤链路温度变化主要影响光纤时间传递的长期稳定性，且这种影响与光纤链路铺设深度和时间传递工作季节有关；激光器波长的随机抖动主要影响光纤时间传递的短期稳定性，而波长漂移主要影响漂移周期对应时间尺度上的时间传递稳定性。当两端激光器波长随机抖动标准差从(0.07, 0.05) pm 变化为(0.27, 0.25) pm 时，3000 km 光纤时间传递的稳定度由3 ps/s 恶化为12 ps/s。

A modal interferometer is experimentally demonstrated based on tapering a single-mode-multimode-single-mode (SMS) fiber structure heated by hydrogen flame. The interference fringe begins to form when tapering length is 19.8 mm, and becomes regular and clear when the tapering length is longer and the tapered waist diameter is smaller. Annealing process is undertaken to achieve a high extension ratio of approximately 17 dB with free spectral range of 1.5 nm when the tapering length is 33 mm and the tapered waist diameter is approximately 5 \mu m. The temperature and axial strain dependences of the tapered SMS structure are characterized, and the measured temperature and strain coefficients are +7 pm/oC and –9.536 pm/\mu \varepsilon, respectively.