Influence of pre-annealing on the thermal regeneration of fiber Bragg gratings in standard optical fibers
2015 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 21, 27520-27535 p.Article in journal (Refereed) Published
A detailed study of the dynamics during thermal regeneration of fiber Bragg gratings, written in hydrogen-loaded standard single-mode fibers using a ns pulsed 213 nm UV laser, is reported. Isothermal pre-annealing performed in the range 85 degrees C to 1100 degrees C, with subsequent grating regeneration at 1100 degrees C, resulted in a maximum refractive index modulation, Delta n(m) similar to 1.4.10(-4), for gratings pre-annealed near 900 degrees C while a minimum value of Delta n(m) similar to 2.10(-5) was achieved irrespective of pre-annealing temperature. This optimum denote an inflection point between opposing thermally triggered processes, which we ascribe to the reaction-diffusion mechanism of molecular water and hydroxyl species in silica. The results shed new light on the mechanisms underlying thermal grating regeneration in optical fibers.
Place, publisher, year, edition, pages
Optical Society of America, 2015. Vol. 23, no 21, 27520-27535 p.
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-173939DOI: 10.1364/OE.23.027520ISI: 000366574400063ScopusID: 2-s2.0-84957556230OAI: oai:DiVA.org:kth-173939DiVA: diva2:856368
QC 201601152015-09-242015-09-242016-01-15Bibliographically approved