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(1)前言目前,采用多模光纤的光通信方式正进入实用化阶段,为此需要各种技术,其中光纤的连接最为重要。现今,随着连接技术的提高,在人孔、隧道等传输线路建设现场,已能获得非常低的接头损耗。可以预料,将来随着接头技术的进一步提高,接头损耗将益发降低。但是,届时由于熔融连接时所外加的热及压进光纤,或者在 V 槽连接中,由于纤维之间有间隙,所以在连接部的折射率分布处,会产生与原来光纤的折射率分布相异的波动。可以设想,这种连接部的折射率分布的波动,会引起接头损耗及模式变换,而接头损耗及模式变换将使传输线路的特性受到影响。传
(1) Preface At present, multi-mode optical fiber optical communication is entering the practical stage, for which a variety of technologies are required, of which optical fiber connection is the most important. Nowadays, with the improvement of connection technology, very low connector loss has been achieved at the construction site of transmission lines such as manholes and tunnels. It can be expected that in the future as the joint technology to further improve the joint loss will benefit less. However, due to the heat applied to the optical fiber during melt-bonding and the optical fiber or the V-groove connection, there is a gap between the fibers at that time, so the refractive index distribution in the connecting portion Different volatility. It is conceivable that fluctuations in the refractive index profile of such a connection cause joint loss and mode change, whereas joint loss and mode change will affect the characteristics of the transmission line. pass