Thermally Stable Type II FBGs Written Through Polyimide Coatings of Silica-Based Optical Fiber

Type II-IR fiber Bragg gratings (FBGs) were written directly through the protective polyimide coatings of off-the-shelf pure silica core and standard telecom Ge-doped silica core single mode fibers using ultrafast IR radiation and the phase mask FBG writing method. Using a short focal length acylind...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 29; no. 21; pp. 1780 - 1783
Main Authors Grobnic, Dan, Hnatovsky, Cyril, Mihailov, Stephen J.
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2017
Subjects
Coatings
fiber Bragg gratings
Fiber gratings
Gratings
Optical fibers
polyimide
Polyimides
Thermal stability
Ultrafast optics
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Summary:Type II-IR fiber Bragg gratings (FBGs) were written directly through the protective polyimide coatings of off-the-shelf pure silica core and standard telecom Ge-doped silica core single mode fibers using ultrafast IR radiation and the phase mask FBG writing method. Using a short focal length acylindrical lens and nonlinear photoluminescent imaging, type II grating structures could be created when Fourier transform limited pulses were chirped to 500 fs. The resulting gratings in the Ge-doped fibers were thermally stable up to 1000 °C and could be used directly as fabricated without annealing to stabilize the structure.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2017.2752128