Dependence of Fiber Bragg Grating Characteristics on its Length

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  • Ando Maki
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Yamauchi Makoto
    Shinko Electric Wire Co., Ltd.
  • Nakayama Keisuke
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Moriyama Kenji
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Fujita Keio
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Masuda Yuji
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Kimura Masanori
    Shinko Electric Wire Co., Ltd.
  • Mizutani Yasuo
    Shinko Electric Wire Co., Ltd.
  • Kimura Susumu
    Shinko Electric Wire Co., Ltd.
  • Yokouchi Takashi
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Suzaki Yoshifumi
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Nakagawa Kiyoshi
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University
  • Ejima Seiki
    Department of Advanced Material Science, Faculty of Engineering, Kagawa University

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Abstract

A fiber Bragg grating (FBG) is normally made with a length of 10 to 30 mm. Depending on the application, however, a short length may be desired, especially in sensor applications for local detection. Under the most common fabrication conditions using the phase mask method, we have fabricated FBGs with lengths ranging from 0.35 to 15 mm using different excimer laser irradiation times. Although 0.35-mm-long FBGs can be made with laser exposure times exceeding 1 h, the practical minimum FBG length appears to be around 3 mm with exposure times in the range of 3 to 5 min.

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