A simple and wavelength-flexible procedure for fabricating phase-shifted fibre Bragg gratings
A simple and wavelength-flexible procedure for fabricating phase-shifted fibre Bragg gratings
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DOI：
10.1088/0957-0233/21/9/094001
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发表时间：
2010-09
影响因子：
2.4
通讯作者：
E. Chehura;S. James;R. Tatam
中科院分区：
文献类型：
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作者：
E. Chehura;S. James;R. Tatam
提出了一种不需要相移掩模的相移光纤布拉格光栅（PSFBG）的制作方法。在单模光纤中顺序地写入两个长度相等且具有相同布拉格波长的标准光纤布拉格光栅（FBG），使得FBG物理上重叠一个光栅周期。该过程在反射光谱的中间诱导光谱孔，相当于π相移FBG。PSFBG已在1300 nm和1550 nm的波长带宽，展示了在中心波长的选择的灵活性。制作的PSFBG进行了比较与模型的基础上修改的Rouard的方法，随后被用来调查的平移阶段的错误的PSFBG的制造上的影响。该模型表明，PSFBG的强度/反射率影响光谱孔的线宽以及器件的精细度，而PSFBG的长度只影响光谱孔的线宽，但不影响器件的精细度。通过这种技术生产的PSFBG器件是可再现的，并且制造过程是快速的，非常适合于WDM PSFBG的制造。
A simple procedure for fabricating phase-shifted fibre Bragg gratings (PSFBGs) that does not require the use of a phase-shifted phase mask is presented. Two standard fibre Bragg gratings (FBGs) of equal length and with the same Bragg wavelength are inscribed sequentially in a single mode optical fibre, such that the FBGs overlap physically by one grating period. This procedure induces a spectral hole in the middle of the reflection spectrum, equivalent to a π-phase-shifted FBG. PSFBGs have been fabricated in the 1300 nm and 1550 nm wavelength bandwidths, demonstrating flexibility in the choice of the centre wavelength. The PSFBGs fabricated are compared with a model based on a modified Rouard's method, which is subsequently used to investigate the influence of translation stage errors on the fabrication of the PSFBGs. The model demonstrates that the strength/reflectivity of the PSFBG influences the spectral-hole linewidth as well as the finesse of the device while the length of the PSFBG affects only the linewidth of the spectral hole but not the finesse of the device. The PSFBG devices produced by this technique are reproducible and the fabrication process is fast and is well suited for the fabrication of WDM PSFBGs.