FREE SPECTRAL RANGE VARIATIONS OF GRATING-BASED FABRY-PEROT FILTERS PHOTOWRITTEN IN OPTICAL FIBERS

被引:35
作者
LEGOUBIN, S [1 ]
DOUAY, M [1 ]
BERNAGE, P [1 ]
NIAY, P [1 ]
BOJ, S [1 ]
DELEVAQUE, E [1 ]
机构
[1] FRANCE TELECOM,CTR NATL ETUD TELECOMMUN,CTR LANNION 13,RESEAU INTEGRE OPT TRAITEMENT SIGNAL OPT,F-22301 LANNION,FRANCE
来源
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION | 1995年 / 12卷 / 08期
关键词
BRAGG GRATINGS; OPTICAL FIBERS; FABRY-PEROT FILTERS; FREE SPECTRAL RANGE;
D O I
10.1364/JOSAA.12.001687
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We fabricated grating-based Fabry-Perot (FP) interferometers by photowriting a pair of Bragg gratings with a spacing of a few millimeters in a germanosilicate fiber. The measured free spectral range (FSR) of the FP filters is found to vary with the frequency in the spectral range of the tilters. Relative FSR variation reaches values close to 10%. An analytical model is presented and compared with a coupled-mode theory in a matrix approach. The computations and the experimental results demonstrate that the main FSR variation (10%) is due to the spectral modification of the reflection coefficients of the two gratings. The relative FSR variation that is due to the propagation effective-index modification is found to be close to 10(-5) A comparison between a grating-based FP filter photowritten in a fiber and a bulk FP filter is presented.
引用
收藏
页码:1687 / 1694
页数:8
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