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Wavelength tuning of polymer optical fibre Bragg grating at longer wavelengths permanently

机译:聚合物光纤布拉格光栅在更长波长处的波长永久性调谐

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摘要

Permanent Bragg wavelength tuning of polymer optical fibre Bragg grating (POFBG) at longer wavelengths has been demonstrated for the first time utilising the thermal annealing process. In general, exposing the polymer material above its β-Transition temperature, the fibre shrinks in length, the Bragg grating period becomes shorter and the Bragg wavelength shifts permanently to shorter wavelengths. In this work, a positive tuning of Bragg wavelength has been shown to be feasible when the polymer fibre is stretched during its thermal exposure. The results show that the degree of Bragg wavelength tuning strongly depends on the applying fibre strain or equivalently stress. The work presented in this paper can be used to multiplex POFBGs at any desirable wavelength.
机译:首次利用热退火工艺证明了较长波长的聚合物光纤布拉格光栅(POFBG)的永久布拉格波长调谐。通常,将聚合物材料暴露于其β转变温度以上,纤维长度会收缩,布拉格光栅的周期会变短,布拉格波长会永久性地移向较短的波长。在这项工作中,当聚合物纤维在热暴露过程中被拉伸时,对布拉格波长进行正向调整是可行的。结果表明,布拉格波长调谐的程度很大程度上取决于所施加的光纤应变或等效应力。本文介绍的工作可用于以任何所需的波长复用POFBG。

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