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弱光作用下相移光纤光栅的光热效应
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摘要
即使入射激光功率比较低,相移光纤光栅(PSFBG)仍然会随激光功率增加产生波长漂移。采用"泵浦-探测"系统分析了PSFBG对入射激光功率和波长的响应,并利用半导体激光器(LD)扫描透射峰的方法进一步验证了弱光作用下导致PSFBG光谱移动的是光热效应而非克尔效应。基于耦合模理论和热传导方程,计算了PSFBG内的温度分布,给出了波长漂移量与入射光功率的理论关系式。分析了PSFBG置于不同环境下的光热效应,得出结论:不同于普通光纤光栅,温控并不足以改善PSFBG的光热效应,在对PSFBG波长漂移非常敏感的应用中,PSFBG的结构参数必须优化以减弱光热效应。
引文
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