5 December 2005 Discrimination between the refractive index and temperature by using a sandwiched structure of long-period gratings
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Proceedings Volume 6019, Passive Components and Fiber-based Devices II; 60191S (2005) https://doi.org/10.1117/12.636283
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China
Abstract
We present a novel scheme for simultaneous measurement of the external RI and temperature by using the sandwiched long-period gratings (SLPGs). An LPG pair coupling between the guided mode and the low-order cladding mode acts a temperature reference element, and another LPG in-between coupling with the higher-order cladding mode performances an RI sensor. The period and length of the paired LPG (with a center to center distance 47.5mm) are 643 μm and 22.5mm, respectively, and those of LPG in-between are chosen to be 428 μm and 23mm, respectively. The experimental results show that the RI sensitivities of a paired LPG coupling with the third order cladding mode is -6.71 nm/R.I.U (refractive index unit), and the sensitivity of the LPG in between coupling with the ninth order cladding mode is -27.77 nm/R.I.U. The temperature sensitivities of these LPGs are -0.315nm/°C; and -0.337nm/°C;, respectively.
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Li-Yang Shao, Li-Yang Shao, A. Ping Zhang, A. Ping Zhang, Jin-Hua Yan, Jin-Hua Yan, Sailing He, Sailing He, "Discrimination between the refractive index and temperature by using a sandwiched structure of long-period gratings", Proc. SPIE 6019, Passive Components and Fiber-based Devices II, 60191S (5 December 2005); doi: 10.1117/12.636283; https://doi.org/10.1117/12.636283
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