Research on the FBG´s high temperature sustainability influenced by the drawing process

The numerous potential applications of UV-induced fiber Bragg gratings (FBGs) in fiber optic sensing and telecommunication have generated a significant interest in this field in recent years. However, two major factors-the photosensitivity of the fiber in which the grating is written and the thermal stability of the grating-are of prime importance in terms of choosing the most appropriate fiber to use and of the long-term functionality of the grating over a wide range of temperatures. Based on the plasma chemical vapor deposition (PCVD) process and high speed drawing process, the high Ge (Germanium) doped photosensitive fiber were developed. It is mature technique that to precise control the dopant quantity by PCVD process and fiber defects control by the drawing process. The photosensitive fibers with same doping process and drawing process have been studied. Based on the experimental results obtained from studies of several kinds of photosensitive fiber on both the photosensitivity and the temperature sustainability of the FBGs written into them, the experimental results exhibit that the drawing temperature and drawing tension influence on the FBG´s high-temperature sustainability. The drawing tension would influence the FBG´s high-temperature sustainability greater than the drawing temperature.