Experimental Research on Multi-Wavelength FBG Fabrication Based on Multiple Exposure

• 作者: Chang WANG Gangding PENG Haifeng QI Jian Guo Jingsheng LV Xiaolei ZHANG
• 来源期刊: 光子传感器:英文版
• 学科: 工学
• 关键词: 光纤光栅 光栅制作 多重曝光 多波长 实验 FBG 制造方法 曝光方法
• 年，卷（期）: 2015,（3）
• 页码范围: 273-277
• 页数: 5页
• 分类号: TN253
• 语种: 中文

摘要

A fabrication method of the multi-wavelength fiber grating (FBG) was introduced. Using the scan exposure method, the multi-wavelength FBG can be successfully manufactured through applying different tensile forces during the multiple exposures process on the same fiber. Experiment results show that the position and the overlap of different sub FBGs will greatly affect the spectrum of every sub FBG. The spectrum of each sub FBG will be affected by short wave oscillation unless the lengths and positions of all sub FBGs are fully overlapped. For hydrogen loaded fiber, the wavelength and reflectivity of the nth level FBG will increase as the (n+1)th level FBG is written. But for germanium doped photosensitive fiber, multiple exposure will increase the wavelength of previous sub FBGs while decrease the reflectivity of all sub FBGs. Through well distributing exposure intensity of every sub FBGs, a four-wavelength FBG with same sub FBG's spectrtLrn was fabricated on a hydrogen loaded single mode fiber.