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Fabrication and Mode Identification of Compact Long-Period Gratings Written by CO _{2} Laser

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4 Author(s)
Chan, H.M. ; Univ. of California, Irvine ; Alhassen, F. ; Tomov, Ivan V. ; Lee, Henry P.

We report highly compact (1.2 cm) long-period fiber gratings (LPGs) exhibiting strong grating effect (>30-dB loss) and low insertion loss (<0.25 dB) inscribed by a continuously scanned CO2 laser. The LPG resonances are also probed using traveling acoustic gratings with variable period. Our results show that these CO2 laser side-exposed LPGs predominantly couple to antisymmetrical cladding modes.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 8 )