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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 5dBto 10dBwhenm=8. 相似文献
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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. 相似文献
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最近DEOS公司的工程师们向人们展示了亚微秒激光脉冲的微细加工能力。光脉冲从密封的CO2激光器平台发出,利用新颖的Q开关技术产生150ns的脉冲。用该种激光器加工的几种材料展现了非常好的性能,如较好的成形,清洁的边缘,很好的持续性,以及最小的热影响区。 相似文献
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