论文部分内容阅读
石墨烯具有特殊的二维柔性结构,可调控费米能级特性和优异的光学、电学性能。利用有限元法,对覆石墨烯微纳光纤光场调控进行理论分析,通过改变石墨烯与缓冲层结构覆微纳光纤的角度,破坏光纤的对称性结构,使光纤具有双折射特性,双折射度大小与石墨烯覆盖角度有关;通过外加电压的方法改变石墨烯的化学势,可对光纤进行开关调控,由此设计出一种包覆石墨烯的微纳光纤电吸收型调制器并进行性能分析。通过数值分析可发现当覆盖光纤角度为270°时,1550nm处双折射度可达1.23×10-3;电吸收调制器工作在1550nm时,器件长度为18μm,消光比为7dB,3dB带宽可达到927 MHz,插入损耗为0.58dB。
Graphene has a special two-dimensional flexible structure that regulates Fermi energy level properties and excellent optical and electrical properties. By using the finite element method, the optical field regulation of graphene-doped micro-nanofiber fiber is theoretically analyzed. By changing the angle of graphene and the buffer layer, the symmetry structure of the fiber is destroyed so that the fiber has the properties of birefringence, birefringence The degree of graphene is related to the angle of graphene coverage. By changing the chemical potential of graphene by applying a voltage, the optical fiber can be switched and controlled. A graphene-based micro / nano-fiber electroabsorption modulator is designed and implemented analysis. Numerical analysis shows that the birefringence at 1550nm can reach 1.23 × 10-3 when the covering fiber angle is 270 °, the device length is 18μm at 1550nm, the extinction ratio is 7dB and the 3dB bandwidth can reach 927 MHz, insertion loss of 0.58dB.