Pospori A, Marques C A F, Sagias G, Lamela-Rivera H, Webb D J
Opt Express. 2018 Jan 22;26(2):1411-1421. doi: 10.1364/OE.26.001411.
The Bragg wavelength of a polymer optical fiber Bragg grating can be permanently shifted by utilizing the thermal annealing method. In all the reported fiber annealing cases, the authors were able to tune the Bragg wavelength only to shorter wavelengths, since the polymer fiber shrinks in length during the annealing process. This article demonstrates a novel thermal annealing methodology for permanently tuning polymer optical fiber Bragg gratings to any desirable spectral position, including longer wavelengths. Stretching the polymer optical fiber during the annealing process, the period of Bragg grating, which is directly related with the Bragg wavelength, can become permanently longer. The methodology presented in this article can be used to multiplex polymer optical fiber Bragg gratings at any desirable spectral position utilizing only one phase-mask for their photo-inscription, reducing thus their fabrication cost in an industrial setting.
利用热退火方法可使聚合物光纤布拉格光栅的布拉格波长发生永久性偏移。在所有已报道的光纤退火案例中，由于聚合物光纤在退火过程中长度会收缩，作者们只能将布拉格波长调至更短波长。本文展示了一种新颖的热退火方法，可将聚合物光纤布拉格光栅永久性地调至任何所需的光谱位置，包括更长波长。在退火过程中拉伸聚合物光纤，与布拉格波长直接相关的布拉格光栅周期会永久性变长。本文提出的方法可用于在任何所需光谱位置复用聚合物光纤布拉格光栅，只需使用一个相位掩膜进行光写入，从而降低其在工业环境中的制造成本。
