Improvement on peak-to-trough ratio of sampled fiber Bragg gratings with multiple phase shifts期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Improvement on peak-to-trough ratio of sampled fiber Bragg gratings with multiple phase shifts

Authors:	Bin Xie Wei Pan Bin Luo Xihua Zou

Institution:	School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031

Abstract:	Via a cascaded structure, the peak-to-trough ratio is considerably improved for sampled fiber Bragg gratings (SFBGs) based on multiple-phase-shift (MPS) technique. This cascaded filter is composed of two identical SFBGs which are inserted with the increasing or decreasing arrangement of phase shifts.With this inverse arrangement of MPS in grating design, the phase fluctuation of individual SFBG can be compensated, and as a result an excellent phase matching condition is realized. In this way, the peak-to-trough ratio in reflection spectra is improved from 6 to 12 dB when multiplication factor m = 4, and from 5 dB to 10 dB when m=8.

Keywords:	phase fluctuation multiple fiber Bragg gratings sampled ratio reflection spectra multiplication factor result matching condition individual compensated inverse grating design filter inserted increasing decreasing technique
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