Temperature and thermo-optic coefficient measurements using optical fibre long period gratings operating at phase matching turning point

2013 ◽  
Author(s):  
S. Korposh ◽  
R. Wong ◽  
S. James ◽  
R. Tatam
Keyword(s):  
Optical Fibre ◽  
Turning Point ◽  
Phase Matching ◽  
Long Period ◽  
Long Period Gratings

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 Fabrication of fiber optic long period gratings operating at the phase matching turning point using an ultraviolet laser

2014 ◽  
Vol 53 (21) ◽  
pp. 4669 ◽  
Author(s):  
Rebecca Y. N. Wong ◽  
Edmond Chehura ◽  
Stephen E. Staines ◽  
Stephen W. James ◽  
Ralph P. Tatam
Keyword(s):  
Turning Point ◽  
Fiber Optic ◽  
Phase Matching ◽  
Ultraviolet Laser ◽  
Long Period ◽  
Long Period Gratings

Giant sensitivity of long period gratings in transition mode near the dispersion turning point: an integrated design approach

2012 ◽  
Vol 37 (19) ◽  
pp. 4152 ◽  
Author(s):  
Pierluigi Pilla ◽  
Cosimo Trono ◽  
Francesco Baldini ◽  
Francesco Chiavaioli ◽  
Michele Giordano ◽  
...  
Keyword(s):  
Turning Point ◽  
Integrated Design ◽  
Design Approach ◽  
Transition Mode ◽  
Long Period ◽  
Long Period Gratings ◽  
Integrated Design Approach
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