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Narrow Bandwidth 850-nm Fiber Bragg Gratings in Few-Mode Polymer Optical Fibers

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4 Author(s)
Stefani, A. ; Dept. of Photonics Eng., Tech. Univ. of Denmark, Lyngby, Denmark ; Wu Yuan ; Markos, C. ; Bang, O.

We report on the inscription and characterization of narrow bandwidth fiber Bragg gratings (FBGs) with 850-nm resonance wavelength in polymer optical fibers (POFs). We use two fibers: an in-house fabricated microstructured POF (mPOF) with relative hole size of 0.5 and a commercial step-index POF, which supports six modes at 850 nm. The gratings have been written with the phase-mask technique and a 325-nm HeCd laser. The mPOF grating has a full-width at half-maximum (FWHM) bandwidth of 0.29 nm and the step-index POF has a bandwidth of 0.17 nm. For both fibers, the static tensile strain sensitivity is measured to be 0.71 pm/με at 850 nm and 1.3 pm/με at 1550 nm.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 10 )

Date of Publication:

May15, 2011

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