title: Thermal response of Bragg gratings in PMMA microstructured optical fibers.
abstract: We report on the thermal characteristics of Bragg gratings fabricated in polymer optical fibers. We have observed a permanent shift in the grating wavelength at room temperature which occurs when the grating has been heated above a threshold temperature. This threshold temperature is dependent on the thermal history of the grating, and we attribute the effect to a shrinking of the fiber. This effect can be avoided by annealing the fiber before grating inscription, resulting in a linear response with temperature and an increased linear operating temperature range of the grating.
authors: Karen E
authors: KE
authors: Carroll
authors: Chi
authors: C
authors: Zhang
authors: David J
authors: DJ
authors: Webb
authors: Kyriacos
authors: K
authors: Kalli
authors: Alexander
authors: A
authors: Argyros
authors: Maryanne C
authors: MC
authors: Large