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The cladding mode of the in-fiber interference sensor relates to the externally sensing physical quantity, so the investigation of the cladding mode is very important for designing and improving the sensing performance of the sensor. By using the finite difference beam propagation method, the interference spectra of the sensors with different lengths and different core-to-core diameter ratios are simulated. Its spatial frequency spectrum is obtained through Fourier transform. The effective refractive index of the dominant cladding mode can be obtained through analyzing its spatial frequency spectrum. Its corresponding cladding mode order can be determined through substituting the values of the effective refractive index into the dispersion equation of sensing optical fiber. The simulation results show that the number and the order of the cladding modes both increase with sensing part fiber length increasing. The interference spectrum becomes dense according to the superposition of multi order cladding mode interferences. Its free spectral space of the sensor output interference spectrum becomes small. With the variations of the input fiber and sensing fiber core-to-core diameter ratio, the power distributions among the modes change obviously. The increase of core-to-core diameter ratio can increase the number and order of the cladding modes.
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Keywords:
- all in-fiber interferometer /
- effective refractive index /
- cladding modes /
- spatial frequency spectrum
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[8] Li L C, Xia L, Xie Z H, Liu D M 2012 Opt. Express 20 11109
[9] Rong Q Z, Qiao X G, Du Y Y, Feng D Y, Wang R H, Ma Y, Sun H, Hu M L, Feng Z Y 2012 IEEE Sens. J. 12 2501
[10] Rong Q Z, Qiao X G, Du Y Y, Feng D Y, Wang R H, Ma Y, Sun H, Hu M L, Feng Z Y 2013 Appl. Opt. 52 1441
[11] Fu H W, Li H D, Shao M, Zhao N, Liu Y G, Li Y, Yan X, Liu Q P 2015 Opt. Lasers Eng. 69 58
[12] Li L C, Xia L, Xie Z H, Hao L N, Shuai B B, Liu D M 2012 Sens. Actuators A: Phys. 180 19
[13] Li L J, Lai Y Z, Cao M Y, Liu C, Yuan X M, Zhang X, Guan J P, Shi J, Li J 2013 Acta Phys. 62 140201 (in Chinese) [李丽君, 来永政, 曹茂永, 刘超, 袁雪梅, 张旭, 管金鹏, 史静, 李晶 2013 62 140201]
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[1] Li L J, Ma Q, Cao M Y, Zhang G N, Zhang Y, Jiang L, Gao C T, Yao J, Gong S S, Li W X Rong Q Z, Qiao X G, Du Y Y, Sun H, Feng D Y, Wang R H, Hu M L, Feng Z Y 2013 Applied Opt. 52 1441
[2] Rong Q Z, Qiao X G, Du Y Y, Sun H, Feng D Y, Wang R H, Hu M L, Feng Z Y 2013 Applied Opt. 52 1441
[3] Zhu J J, Zhang P A, Xia T H, et al. 2010 IEEE Sens. J. 10 1415
[4] Li L J, Ma Q, Zhang Y, Cao M Y, Zhang G N, Jiang L, Gao C T, Yao J, Li Y D, Gong S S, Li W X Canning J, Garter A L 1997 Opt. Lett. 22 561
[5] Canning J, Garter A L 1997 Opt. Lett. 22 561
[6] Hae Y C, Myong J K, Byeong H L 2007 Opt. Express 15 5711
[7] Linh V N, Dusun H, Sucbei M, Dae S M, Youngjoo C 2008 Opt. Express 16 11369
[8] Li L C, Xia L, Xie Z H, Liu D M 2012 Opt. Express 20 11109
[9] Rong Q Z, Qiao X G, Du Y Y, Feng D Y, Wang R H, Ma Y, Sun H, Hu M L, Feng Z Y 2012 IEEE Sens. J. 12 2501
[10] Rong Q Z, Qiao X G, Du Y Y, Feng D Y, Wang R H, Ma Y, Sun H, Hu M L, Feng Z Y 2013 Appl. Opt. 52 1441
[11] Fu H W, Li H D, Shao M, Zhao N, Liu Y G, Li Y, Yan X, Liu Q P 2015 Opt. Lasers Eng. 69 58
[12] Li L C, Xia L, Xie Z H, Hao L N, Shuai B B, Liu D M 2012 Sens. Actuators A: Phys. 180 19
[13] Li L J, Lai Y Z, Cao M Y, Liu C, Yuan X M, Zhang X, Guan J P, Shi J, Li J 2013 Acta Phys. 62 140201 (in Chinese) [李丽君, 来永政, 曹茂永, 刘超, 袁雪梅, 张旭, 管金鹏, 史静, 李晶 2013 62 140201]
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