Birefringence switching of Bragg gratings in fibers with internal electrodes
2008 (English)In: Optics Express, ISSN 1094-4087, Vol. 16, no 11, 8229-8235 p.Article in journal (Refereed) Published
A fiber Bragg grating was written in a side-hole fiber with internal metal alloy electrodes. The initial geometrical birefringence of this fiber gives rise to two Bragg resonances separated by 43 pm. Nanosecond risetime current pulses of up to 23 A were applied to the metal electrode, which heated and expanded rapidly. This caused mechanical stress in the fiber on a nanosecond scale, resulting in a negative shift of the Bragg wavelength peak for the fast axis mode, and positive but smaller shift for the slow axis mode. The fast change increased the peak separation to similar to 143 pm, corresponding to an increase in birefringence from 4.0 x 10(-5) to 1.3 x 10(-4). Both peaks subsequently experienced a red-shift due to the relaxation of mechanical stress and the increasing core temperature transferred from the metal in many microseconds. Simulations give accurate description of the experimental results.
Place, publisher, year, edition, pages
2008. Vol. 16, no 11, 8229-8235 p.
side-hole fiber, pressure
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-17581DOI: 10.1364/OE.16.008229ISI: 000256469900070ScopusID: 2-s2.0-44649114560OAI: oai:DiVA.org:kth-17581DiVA: diva2:335625
QC 201005252010-08-052010-08-052010-09-22Bibliographically approved