一、前言近一、二年来,随着光纤制造技术的进步,光纤的特性有了显著的改善,约1分贝/千米的低损耗光纤已研制成功。这就使光纤向实用化迅速前进。用光纤传输信息,具有许多优点:(1)传输频带宽、容量大;(2)体积小、重量轻;(3)抗干扰能力强;(4)保密性好;(5)资源丰富。在光纤由基础研究阶段向实用化阶段的进程中,各种测试方法的研究和测试装置的研制,具有极其重 I. Preface In the recent one or two years, with the advancement of optical fiber manufacturing technology, the characteristics of optical fibers have been significantly improved. Low-loss optical fibers of about 1 dB / km have been successfully developed. This makes the fiber to the practical rapid progress. Optical fiber transmission of information has many advantages: (1) transmission bandwidth, large capacity; (2) small size, light weight; (3) strong anti-interference ability; (4) confidentiality is good; In the optical fiber from the basic research stage to the practical stage of the process, a variety of test methods research and test equipment development, with extremely heavy