基于立体石墨烯-微光纤结构的超高调制深度偏振相关全光调制器
Polarization-dependent all-optical modulator with ultra-high modulation depth based on a stereo graphene-microfiber structure
摘要：
报道了一种基于石墨烯-微光纤立体结构（GMF）的同轴偏振相关全光纤调制器。由于独特的弹簧状几何形状，可以实现超长的GMF相互作用长度，并且对于一个偏振态，表现出~7.5 dB的超高调制深度（MD）和~0.2 dB/mW的高调制效率（ME）。其MD和ME比其他石墨烯波导混合型全光调制器的MD和ME大一个数量级以上。通过进一步优化转移和清洁过程，调制器可以快速地在透明和不透明状态之间切换，对于两种偏振状态，最大MD为数十分贝。该调制器与当前的光纤通信系统兼容，并可能在不久的将来应用于满足超快光信号处理的迫切需要。
英文摘要：
We report an in-line polarization-dependent all-optical fiber modulator based on a stereo graphene-microfiber structure (GMF) by utilizing the lab-on-rod technique. Owing to the unique spring-like geometry, an ultra-long GMF interaction length can be achieved, and an ultra-high modulation depth (MD) of ~7.5 dB and a high modulation efficiency (ME) of ~0.2 dB/mW were demonstrated for one polarization state. The MD and ME are more than one order larger than those of other graphene-waveguide hybrid all-optical modulators. By further optimizing the transferring and cleaning process, the modulator can quickly switch between transparent and opaque states for both the two polarization states with a maximized MD of tens of decibels. This modulator is compatible with current fiber-optic communication systems and may be applied in the near future to meet the impending need for ultrafast optical signal processing.
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