光敏光纤机械可靠性研究

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涂峰^*1  杨晨² 刘德明¹

¹ 华中科技大学光电子科学与工程学院  ² 长飞光纤光缆有限公司研发中心  430073

Feng Tu^*a，Chen Yang^b，Deming Liu^a

<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />^aHuazhong University of Science and Technology 430074；

^bYangtze optical fiber and cable company 430073

Abstract

　　With the expand of application of the fiber grating in the fiber communication area，the quality of fiber grating is required more higher. Many application situation request it should resist high temperature and high pressure，and also should be long period stability. The photosensitive fiber’s mechanical reliability has become one of the most crucial performances with the increase of the use length. This paper review the research evolvement of the normal single mode fiber’s mechanical reliability. Based on the standard measure method of the normal fiber，research on the mechanical reliability of the high Ge doped and Ge/B co－doped photosensitive fiber. The measurement results validate that our fabricate process does not import affixation defect，the mechanical reliability approach the normal single mode fiber’s. It can be forecast that with the continuing deep understand of the photosensitive fiber，the fiber communication and fiber sensor would be greatly developed.

　　Key words：photosensitive fiber，mechanical reliability，prooftest strength，resist pull strength

　　引言

　　1978年K.O.Hill^[1]对紫外光纤光敏性的发现和1989年G.Meltz^[2]首次用干涉法写出通信波长的光纤光栅给现代光纤通信带来了深刻的变革，它已被用于制作色散补偿器、滤波器、波分复用器和传感器等各个方面，普通光纤中的紫外光敏性有限，不能写出高反射率的光栅，除非采用氢载（H2 loading）等增敏技术，但这不但消耗时间还会带来光纤熔接时的危险性，以及不能在拉丝时在线写入光栅，从而不能大批量快速生产光栅，并且不在线写入方式降低了光纤的强度。这就需要研制出本身具有较高光敏性的光敏光纤。高掺锗的光纤是一种较好的选择，它可以利用现有的工艺制备，而且紫外光导致的有效折射率改变可达10－ 4；硼最初是用来降低光纤包层的折射率，后来偶然发现即便不用氢载处理，它与锗共掺也可以大幅度提高光纤的光敏性，Ge/B光纤现已成为国际上写紫外光纤光栅的首选光纤。Ge/B光纤的紫外光敏性是现在发现的不用氢载处理的光纤中光敏性最高的，Δn可达10－ 3以上，远高于普通光纤中的10－ 5和高掺锗光纤中的10－ 4。