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提高光纤强度的方法都是消除光纤表面的微裂纹。而提高光纤强度既是系统工程,又是环境工程,贯穿在光纤制作的各个环节。微纹刻蚀技术、TiO_2涂覆等方法用作消除表面微裂纹是有效的,而钝化工艺及密封涂覆既可消去光纤表面微裂纹,亦可解决光纤“疲劳”问题。碳涂覆较金属涂覆、陶瓷材料涂覆理想,因为碳的低扩散系数允许使用较薄的涂覆防止氢和水的渗透,碳的低弹性模量使碳涂覆光纤在破断之前就能经受很高的应力,并且碳涂覆的拉丝速度可达600m/min。
The way to increase fiber strength is to eliminate the micro-cracks on the fiber surface. The improvement of optical fiber strength is not only a systematic project, but also an environmental project, which runs through every link of optical fiber production. Micro-etching technology, TiO 2 coating and other methods for the elimination of surface micro-cracks is effective, while the passivation process and seal coating can eliminate optical fiber surface micro-cracks, but also solve the optical fiber “fatigue” problem. Carbon coating is preferable to metal coating and ceramic coating since the low diffusion coefficient of carbon allows the use of thinner coatings to prevent the infiltration of hydrogen and water and the low modulus of elasticity of carbon allows the carbon coated fiber to break before it is broken Withstands high stresses, and carbon coated drawing speeds up to 600 m / min.