提出了一种基于改进的棱镜-波导耦合技术实现全光调制的方法.以有机聚合物热光效应为例,泵浦光从等腰三角棱镜顶端垂直入射到光波导上,这样泵浦光和探测光能较容易地耦合到应力点上,从而实现泵浦光对探测光的调制,验证了利用该装置实现全光调制的可行性.观测到基于聚甲基丙烯酸甲酯(PMMA)和蒽醌(An7)染料混合薄膜波导的热光效应的全光调制现象,随着泵浦光功率的增大,探测光功率线性减少,调制响应时间约为20 ms.该方法也可以用于具有更快响应时间的基于三阶非线性克尔效应的全光调制或全光开关.
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