Theory and experiment of refractive index change of long-period fiber grating induced by CO2 laser pulses

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Pages (from-to)6316-6322
Journal / PublicationWuli Xuebao/Acta Physica Sinica
Issue number9
Publication statusPublished - Sep 2009


The mechanism of refractive index change of long period fiber gratings (LPFGs) induced by high frequency CO2 laser pulses is investigated in theory and by experiment. It is found that the release of residual stress, rapid solidification, fiber densification and fusion distortion are discovered to be the main mechanisms of formation of this kind of gratings. The above four mechanisms play different roles when different fibers, different scanning methods and the different laser power were used in the process of LPFG fabrication. The average refractive index changes of the core and cladding were measured by using M-Z interferometer formed by LPFG pair in this paper, which provides the experimental basis for fabricating all-fiber devices. ©2009 Chin. Phys. Soc.

Research Area(s)

  • CO2 laser pulses, Long period fiber grating, Optical fiber components, Refractive index change