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Proceedings Paper

Effects of the asymmetric refractive index change profile on the reflection spectra of multimode fiber Bragg gratings
Author(s): Hong-Gang Yu; Yong Wang; Chun Yang; Qing-Yang Xu; Xiao-Le Yang; Chang-Qing Xu
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Paper Abstract

In this paper, the effects of the asymmetric refractive index change profile on the reflection spectra of multimode fiber Bragg gratings (MMFBGs) are experimentally and theoretically investigated. Different guided modes in a multimode fiber (MMF) are coupled with each other and the sub-reflection peaks are generated if the refractive index change profile of the MMFBG is asymmetric in the cross section of the fiber core. It is found that by increasing the UV exposure, the reflectivities of the main reflection peaks are decreased, the reflectivities of the sub-peaks are increased, even higher than the main reflection peaks, which indicate the grating becomes more asymmetric with increasing the UV exposure. It is further shown that an MMFBG is much more sensitive to the polarization state of the injected light compared with an SMFBG. The numerical simulations are carried out to explain the excitation condition dependence of the reflection spectra of MMFBG, which agree well with the experimental results.

Paper Details

Date Published: 12 October 2005
PDF: 8 pages
Proc. SPIE 5970, Photonic Applications in Devices and Communication Systems, 597008 (12 October 2005); doi: 10.1117/12.628783
Show Author Affiliations
Hong-Gang Yu, McMaster Univ. (Canada)
Yong Wang, McMaster Univ. (Canada)
Chun Yang, McMaster Univ. (Canada)
Qing-Yang Xu, McMaster Univ. (Canada)
Xiao-Le Yang, McMaster Univ. (Canada)
Chang-Qing Xu, McMaster Univ. (Canada)


Published in SPIE Proceedings Vol. 5970:
Photonic Applications in Devices and Communication Systems
Peter Mascher; John C. Cartledge; Andrew Peter Knights; David V. Plant, Editor(s)

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