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Based on Sagnac interferometer by incorporating a segment of side-leakage photonic crystal fiber (SLPCF), a curvature sensor with high sensitivity and broad linear measurement range was proposed and demonstrated experimentally. Experimental results show that high sensitivity to curvature can be achieved by measuring group modal birefringence and wavelength shift of transmission dip when the linear side-leakage defect is in the same direction as the bending, but the linear measuring range is not large enough to cover the small curvature. When the linear side-leakage defect is in the vertical direction to the bending, the sensitivity can be as high as 10.798 nm·m-1 and the linear measurement range as wide as 0–5.03 m-1 by measuring wavelength shift of transmission. Combined with the introduction of the measurement matrix, the measurement of temperature and curvature can be realized simultaneously, which would offer a way to eliminate the perturbation of the environment temperature to the measurement values of the curvature. Under the same conditions, though the sensitivity obtained by measuring group modal birefringence is low, it can be regarded as a curvature sensor which is insensitive to temperature.
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Keywords:
- curvature sensor /
- side-leakage photonic crystal fiber /
- high sensitivity /
- broad linear measurement range
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[19] Dong X, Tam H Y, Shum P 2007 Appl. Phys. Lett. 90 151113
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[1] Guo T, Ivanov A, Chen C, Albert J 2008 Opt. Lett. 33 1004
[2] Jin Y, Chan C, Dong X, Zhang Y 2009 Opt. Commun. 282 3905
[3] Shao L Y, Albert J 2010 Opt. Lett. 35 1034
[4] Shao L Y, Laronche A, Smietana M, Mikulic P, Bock W J, Albert J 2010 Opt. Commun. 283 2690
[5] Wang Y P, Rao Y J, Ran Z L, Zhu T 2003 Acta Phys. Sin. 52 1432 (in Chinese) [王义平, 饶云江, 冉曾令, 朱涛 2003 物理学报 52 1432]
[6] Liu Y, Zhang L, Williams J, Bennion I 2001 Opt. Commun. 193 69
[7] Liu Y, Williams J, Bennion I 2000 IEEE Photon. Technol. Lett. 12 531
[8] Frazao O, Silva S, Viegas J, Baptista J M, Santos J L, Kobelke J, Schuster K 2010 IEEE Photon. Technol. Lett. 22 1300
[9] Harhira A, Lapointe J, Kashyap R 2010 Optical Society of America
[10] Gong Y, Zhao T, Rao Y J, Wu Y 2011 IEEE Photon. Technol. Lett. 23 679
[11] Zhou Y, Zhou W, Chan C C, Wong W C, Shao L Y, Cheng J, Dong X 2011 Opt. Commun. 284 5669
[12] Gong H, Chan C, Zu P, Chen L, Dong X 2010 Opt. Commun. 283 3142
[13] Hwang K J, Kim G H, Lim S D, Lee K, Park J W, Lee S B 2011 Jpn. J. Appl. Phys. 50 032202
[14] Zhao Y, Jin Y, Liang H, Wang J, Dong X 2011 Microw. Opt. Technol. Lett. 53 2066
[15] Lou S Q, Wang X, Lu W L 2013 Acta. Phys. Sin. 62 084216 (in Chinese) [娄淑琴, 王鑫, 鹿文亮 2013 物理学报 62 084216]
[16] Gander M, MacPherson W, McBride R, Jones J, Zhang L, Bennion I, Blanchard P, Burnett J, Greenaway A 2000 Electron. Lett. 36 120
[17] Han Y G, Kim G, Lee K, Lee S B, Jeong C H, Oh C H, Kang H J 2007 Opt. Express 15 12866
[18] Rao Y J, Wang Y P, Ran Z L, Zhu T 2003 J. Lightw. Technol. 21 1320
[19] Dong X, Tam H Y, Shum P 2007 Appl. Phys. Lett. 90 151113
[20] Frazão O, Silva S, Baptista J, Santos J, Statkiewicz-Barabach G, Urbanczyk W, Wojcik J 2008 App. Opt. 47 4841
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