为了提高特殊截止单模光纤的弯曲可靠性,采用气相沉积工艺制作了包层直径80 μm碳涂覆的特殊截止单模光纤,测试了光纤的截止波长、模场、衰减谱、宏弯、色散等传输性能和应力腐蚀敏感性参数。测试结果表明光纤截止波长小于915 nm,能够实现915 nm以上波长单模工作,在常用的几个波段具有较低的传输损耗,光纤的零色散波长红移到1 670 nm。采用碳涂覆工艺提高光纤的应力腐蚀敏感性参数达到35,结合小包层直径预期可以提高光纤的使用寿命。

An 80 μm selected cut-off wavelength single mode optical fiber was prepared by CVD process. The transmission characteristics, such as mode field, loss spectra, macro bending, dispersion, temperature cycling, were measured. The results show that cut-off wavelength is less than 915 nm, transmission loss is low in conventional waveband, and zero dispersion wavelength is shifted 1 670 nm. The fatigue parameter is 35, and the fiber is expected high lifetime.