一、前言在光缆制造工程中光纤的二次被复是相当重要的工艺,它影响到光纤的机械性能、传输性能及长期稳定性。为此,几年来我们对二次被复的结构、工艺、材料进行了探索试验,取得了一定成绩。对光纤的二次被复主要有如下要求:①被复光纤能耐侧压和弯曲;②被复引起的附加损耗小;③被复光纤损耗的温度特性好;④传输性能的长期稳定性。我们的研制工作也就是根据这几点来做的。 I. Introduction In the fiber optic cable manufacturing engineering in the second is too complex fiber is a very important process, which affects the optical fiber mechanical properties, transmission performance and long-term stability. For this reason, we have made some explorations and tests on the structures, processes and materials that have been reworked in the past few years and achieved some success. There are two main requirements for the optical fiber to be duplicated: (1) the fiber to be covered is resistant to lateral pressure and bending; (2) the additional loss caused by the fiber is small; (3) the temperature characteristic of the fiber being consumed is good; (4) the long-term stability of transmission performance. Our research work is based on these points to do.