Temperature and strain insensitive long period gratings (LPGs) in W fibre with post-annealing

Publisher:
SPIE
Publication Type:
Conference Proceeding
Citation:
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 2015, 9634
Issue Date:
2015-01-01
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© 2015 SPIE. LPGs with ultra-low strain and temperature sensitivities are reported in germanosilicate fibre with a W-shaped index profile. Through low temperature annealing, the temperature and strain coefficients are dramatically reduced to dλ/dT ~ - (8.75×10 -2 ) pm/K and dλ/dε ~ (2.21×10 -2 ) pm/με respectively. As a control reference, LPGs in standard SMF-28 fibre were inscribed but were not found to exhibit similar reductions in sensitivity; this illustrates that the design of the Wshaped, with its inner cladding, plays a key role in altering the LPG performance.
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