As the oxide-induced disruption from silicon dioxide substrate would greatly decrease the thermal property of graphene, strategies to optimize the thermo-optical response through controlling laser spot size, layer number and covering length of graphene layer are experimentally studied and discussed. An all-optical controlled fiber Mach–Zehnder interferometer with multilayer and monolayer graphene achieved by thermo-optical effects is subsequently proposed to prove the improvements. Graphene layers with 6 mm length were transferred to the middle taper and heated by an external laser. The maximum switching extinction ratio reached 16.2 dB. The response time and modulation efficiency were approximately 620 μs and 0.22 dB mW−1, respectively. This work suggests an effective way to improve the thermal property of graphene-fiber hybrid structure for all-optical control in fiber based integrated system. Moreover, the cost and complexity of device manufacturing are greatly reduced.

中文翻译：

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多层石墨烯改善全光控光纤干涉仪的界面热性能

由于二氧化硅基底的氧化物引起的破坏会大大降低石墨烯的热性能，因此通过实验研究和讨论了通过控制激光光斑尺寸、层数和石墨烯层覆盖长度来优化热光响应的策略。随后提出了一种通过热光效应实现的具有多层和单层石墨烯的全光控制光纤 Mach-Zehnder 干涉仪以证明改进。6 毫米长的石墨烯层被转移到中间锥体上，并由外部激光加热。最大开关消光比达到 16.2 dB。响应时间和调制效率分别约为 620 μs 和 0.22 dB mW-1。这项工作提出了一种提高石墨烯-纤维混合结构热性能的有效方法，用于基于光纤的集成系统中的全光控制。而且，器件制造的成本和复杂性大大降低。