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

Wen Liu; John Canning; Kevin Cook; Cicero Martelli

doi:10.1117/12.2191874

28 September 2015 Temperature and strain insensitive long period gratings (LPGs) in W fibre with post-annealing

Wen Liu, John Canning, Kevin Cook, Cicero Martelli

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96344L (2015) https://doi.org/10.1117/12.2191874
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

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/d epsilon ~ (2.21×10^-2) pm/μepsilon 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 W-shaped, with its inner cladding, plays a key role in altering the LPG performance.

Citation Download Citation

Wen Liu, John Canning, Kevin Cook, and Cicero Martelli "Temperature and strain insensitive long period gratings (LPGs) in W fibre with post-annealing", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96344L (28 September 2015); https://doi.org/10.1117/12.2191874

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KEYWORDS

Annealing

Temperature metrology

Cladding

Glasses

Defense technologies

Fiber Bragg gratings

Optical filters

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