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

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Conference Proceeding
Proceedings of SPIE - The International Society for Optical Engineering, 2015, 9634
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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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