Investigations of the spectral sensitivity of long period gratings fabricated three-layered optical fiber

2003 ◽  
Vol 21 (1) ◽  
pp. 264-268 ◽  
Author(s):  
T. Allsop ◽  
D.J. Webb ◽  
I. Bennion
Keyword(s):  
Optical Fiber ◽  
Spectral Sensitivity ◽  
Long Period ◽  
Long Period Gratings

scholarly journals The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber

2004 ◽  
Author(s):  
Thomas D. Allsop ◽  
Tim Earthrowl ◽  
Helen Dobb ◽  
Vladimir Mezentsev ◽  
Andrew M. Gillooly ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Spectral Sensitivity ◽  
Long Period ◽  
Long Period Gratings ◽  
Elliptical Core

scholarly journals Soil moisture content measurement using optical fiber long period gratings

2017 ◽  
Author(s):  
J. S. Hallett ◽  
M. Partridge ◽  
S. W. James ◽  
D. Tiwari ◽  
T. Farewell ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Optical Fiber ◽  
Soil Moisture Content ◽  
Long Period ◽  
Content Measurement ◽  
Long Period Gratings ◽  
Moisture Content Measurement

scholarly journals Optical Fiber Interferometers Based on Arc-Induced Long Period Gratings at INESC TEC

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7400
Author(s):  
Paulo Caldas ◽  
Gaspar Rego
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Cavity Length ◽  
Fiber Optic ◽  
Fiber Diameter ◽  
Long Period Grating ◽  
Long Period ◽  
Long Period Gratings ◽  
Cladding Mode ◽  
Mode A

In this work, we review the most important achievements of an INESC TEC long-period-grating-based fiber optic Michelson and Mach–Zehnder configuration modal interferometer with coherence addressing and heterodyne interrogation as a sensing structure for measuring environmental refractive index and temperature. The theory for Long Period Grating (LPG) interferometers and coherence addressing and heterodyne interrogation is presented. To increase the sensitivity to external refractive index and temperature, several LPG interferometers parameters are studied, including order of cladding mode, a reduction of the fiber diameter, different type of fiber, cavity length and the antisymmetric nature of cladding modes.

The spectral sensitivity of long period gratings fabricated in elliptical core D-shaped optical fibre

2006 ◽  
Vol 259 (2) ◽  
pp. 537-544 ◽  
Author(s):  
T. Allsop ◽  
H. Dobb ◽  
V. Mezentsev ◽  
T. Earthgrowl ◽  
A. Gillooly ◽  
...  
Keyword(s):  
Spectral Sensitivity ◽  
Optical Fibre ◽  
Long Period ◽  
Long Period Gratings ◽  
Elliptical Core
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