Abstract

We fabricated an asymmetric long-period grating (LPG) by periodically tapering a section of standard single-mode fiber using a resistive filament heating. The LPG exhibits large peak transmission attenuation of $-30.31\mathrm{dB}$ with only 22 periods in a $1.0\mathrm{cm}$ long optical fiber and possesses unique characteristics for sensing applications. The bending and strain sensitivities are $1.74\mathrm{nm}\mathrm{m}$ and $1.11\mathrm{pm/}\mathrm{\mu \epsilon }$, respectively. The polarization dependent loss is large, up to $11.65\mathrm{dB}$, which is caused by an asymmetric index profile in the cross section of the tapered LPG.

© 2008 Optical Society of America

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