scholarly journals Response of a fibre optic long period grating operating at the phase matching turning point to the deposition of a nanostructured coating

2009 ◽  
Author(s):  
S. W. James ◽  
S. M. Topliss ◽  
S. C. Cheung ◽  
R. P. Tatam
Keyword(s):  
Turning Point ◽  
Nanostructured Coating ◽  
Phase Matching ◽  
Fibre Optic ◽  
Long Period Grating ◽  
Long Period

scholarly journals Sensitivity Characterization of Cascaded Long-Period Gratings Operating near the Phase-Matching Turning Point

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 5978
Author(s):  
Wei Zhou ◽  
Yanli Ran ◽  
Zhijun Yan ◽  
Qizhen Sun ◽  
Chen Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Temperature Sensitivity ◽  
Turning Point ◽  
Phase Matching ◽  
Long Period ◽  
Long Period Gratings ◽  
High Measurement ◽  
Surrounding Refractive Index ◽  
Wavelength Resolution ◽  
Quality Factor Q

We characterized a cascaded long-period gratings (LPGs)-based sensor that was operating at the phase-matching turning point (PMTP). The cascaded LPGs constructed an in-fiber Mach–Zehnder interferometer (MZI), which exhibited a series of high-quality-factor (Q) narrow-bandwidth resonance peaks. As the LPG operated at the PMTP, the proposed sensor showed an ultrahigh refractive index (RI) and temperature sensitivity, and high measurement precision. In this study, we took an in-depth look at the effects of grating separation on Q-factor and sensitivity. The results showed that the sensitivity to the surrounding refractive index (SRI) reached 4741.5 nm/RIU at 1.4255 and 2138 nm/RIU, over the range of 1.335–1.373. In addition, the temperature sensitivity was around 4.84 nm/°C. With a 0.02 nm wavelength resolution, the RI and temperature sensing limits were 9.3 × 10−6 RIU and 5.5 × 10−3 °C.

scholarly journals Fibre optic chemical sensor based on graphene oxide-coated long period grating

2016 ◽  
Author(s):  
Chen Liu ◽  
Qi Cai ◽  
Zhongyuan Sun ◽  
Baojian Xu ◽  
Jianlong Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Chemical Sensor ◽  
Fibre Optic ◽  
Long Period Grating ◽  
Long Period

Fibre-optic interferometric immuno-sensor using long period grating

2006 ◽  
Vol 42 (6) ◽  
pp. 324 ◽  
Author(s):  
D.W. Kim ◽  
Y. Zhang ◽  
K.L. Cooper ◽  
A. Wang
Keyword(s):  
Fibre Optic ◽  
Long Period Grating ◽  
Long Period
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