Spectra of dual overwritten fiber Bragg grating

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• 作者：Bao ; Jilong ; Zhang ; Xianmin ; Chen ; Kangsheng ; Zhou ; Wen
• 关键词：Dual overwritten grating ; Fiber Bragg grating ; Coupled-mode theory
• 刊名：Optics Communications
• 出版年：2001
• 出版时间：February 1, 2001
• 年：2001
• 卷：188
• 期：1-4
• 页码：31-39
• 全文大小：179 K

文摘

The perturbation to the refractive index induced by dual overwritten fiber Bragg grating (FBG) is analyzed, and the coupled-mode equations are obtained. The spectral characteristics that can be achieved in dual overwritten fiber gratings are investigated by numerical simulation. It is found that the spectral characteristics are affected significantly by period difference ΔΛ, primary phase difference Δφ and grating length L. Moreover, multiwavelength reflection and strong second harmonics will occur in dual written FBG when the nonlinear UV-induced index perturbation exists, which is very useful for multichannel wavelength-division multiplexing. The results concluded in this paper are conducive to the fabrication and applications of dual overwritten FBGs.