Study on the sensing characteristics of a local micro-structured long period fiber grating

Abstract

A simple and effective method employing a local micro-structured long period fiber grating (LMS-LPFG) for the simultaneous measurement of temperature and refractive index is proposed and investigated experimentally. The LMS-LPFG is formed by using the partial etching technique with hydrofluoric (HF) acid in a standard LPFG, in which there are discontinuities in the effective refractive index of cladding modes. Similar to the phase shift theory, a narrow passband and two stopbands are formed. The temperature and the surrounding refractive index (SRI) characteristics of the two stopbands and passband are studied. The temperature sensitivities of the two stopbands and passband are 0.05 nm/°C approximately. The SRI sensitivity of passband (−61.56 nm/RIU) is bigger than that of the two stopbands (−35.62 nm/RIU). Thus, with the sensitive matrix, we can simultaneously measure the changes of temperature and refractive index.

Keywords

Refractive Index / Fiber Bragg Grating / Effective Refractive Index / Core Mode / IEEE Photonic Technology Letter

References

[1] ShiS-h, ZhouX-j, ZhangZ-y, LiuY. Journal of Optoelectronics·Laser, 2012, 23: 1644

[2] IadiciccoA, CusanoA, CampopianoS, Cutolo, Antonello, GiordanoM. IEEE Sensors Journal, 2005, 5: 1288

[3] CaoY, YangY, YangX, TongZ. Chinese Optics Letters, 2012, 10: 030605

[4] YanJ-H, ZhangA P, ShaoL-Y, DingJ-F. IEEE Sensors Journal, 2007, 7: 1360

[5] ZhaoH, ChengP, BaoJ, ShenH, LiL, DuH. Chinese Journal of Lasers, 2012, 39: 1205005

[6] ChenL R. Optics Communications, 2001, 200: 187

[7] ChungK-W, YinS. Microwave and Optical Technology Letters, 2005, 45: 18

[8] ZhangL, MiaoF, SuiQ-m, FengD-j, LiuH-p, LiuH-l. Journal of Optoelectronics ·Laser, 2012, 23: 897

[9] GuZ-t, ZhaoX-y, ZhangJ-t. Optoelectronics Letters, 2009, 5: 244

[10] NavruzI, AltuncuA. Journal of Lightwave Technology, 2008, 26: 2155

[11] KeH, ChiangK S, PengJ H. IEEE Photonics Technology Letters, 1998, 10: 1596

[12] XiaolanL, WeigangZ, ShanshanZ, HongjianF, LimeiY. Acta Optica Sinica, 2011, 31: 0606006

[13] LiX-l, ZhangW-g, ShangJ-b, ZhangS-s. Journal of Optoelectronics·Laser, 2012, 23: 413

[14] IadiciccoA, CampopianoS, GiordanoM, CusanoA. Applied Optics, 2007, 46: 6945

[15] ChiangK S, LiuY, NgM N, DongX. Electronics Letters, 2000, 36: 966

[16] Martinez-RiosA, Monzon-HernandezD, Torres-GomezI. Optics Communications, 2010, 283: 958