Woyessa Getinet, Nielsen Kristian, Stefani Alessio, Markos Christos, Bang Ole
Opt Express. 2016 Jan 25;24(2):1206-13. doi: 10.1364/OE.24.001206.
The effect of humidity on annealing of poly (methyl methacrylate) (PMMA) based microstructured polymer optical fiber Bragg gratings (mPOFBGs) and the resulting humidity responsivity are investigated. Typically annealing of PMMA POFs is done in an oven without humidity control around 80°C and therefore at low humidity. We demonstrate that annealing at high humidity and high temperature improves the performances of mPOFBGs in terms of stability and sensitivity to humidity. PMMA POFBGs that are not annealed or annealed at low humidity level will have a low and highly temperature dependent sensitivity and a high hysteresis in the humidity response, in particular when operated at high temperature. PMMA mPOFBGs annealed at high humidity show higher and more linear humidity sensitivity with negligible hysteresis. We also report how annealing at high humidity can blue-shift the FBG wavelength more than 230 nm without loss in the grating strength.
研究了湿度对基于聚甲基丙烯酸甲酯（PMMA）的微结构聚合物光纤布拉格光栅（mPOFBGs）退火的影响以及由此产生的湿度响应特性。通常，PMMA光纤的退火是在没有湿度控制的烤箱中于80°C左右进行的，因此湿度较低。我们证明，在高湿度和高温下进行退火可以提高mPOFBGs在稳定性和湿度敏感性方面的性能。未退火或在低湿度水平下退火的PMMA光纤布拉格光栅将具有较低且高度依赖温度的灵敏度以及湿度响应中的高滞后现象，特别是在高温下运行时。在高湿度下退火的PMMA mPOFBGs显示出更高且更线性的湿度灵敏度，滞后现象可忽略不计。我们还报告了在高湿度下退火如何使FBG波长蓝移超过230 nm而不会损失光栅强度。
