SOI环形光波导谐振腔双层石墨烯调制器

在片上光互连系统中，电光调制器起到将电信号调制为光信号的作用，是光互联系统中的核心部件之一。调制器的3 dB带宽决定着载波所能携带的最大信息量,是衡量调制器性能的核心参数。利用石墨烯和高Q环形谐振腔设计成具有CMOS结构的新型调制器，其集成了石墨烯的宽带吸收、载流子迁移率高等材料优势和高Q值环形光学谐振腔的光程放大的结构优势，通过理论计算，其3 dB调制带宽可以达到100 GHz。同时，基于微环谐振腔的石墨烯电光调制器结构可以方便的与光互联系统中的波分复用器相集成，从而提升片上光互联系统的集成度和降低技术复杂性。

SOI-ring waveguide-coupled double-layer graphene modulator

The electro-optic modulator is an important component in the optical interconnected system, which plays a role in controlling optical signal by electrical pulse. The 3 dB bandwidth is a representative performance parameter that determines the maximum amount of information that can be carried in the input light. An electro-absorption optical modulator concept based upon a dual-graphene layer is presented. The device consists of a silicon-on-insulator micro-ring waveguide resonator upon which two graphene layers reside, separated by a thin insulating region. The lower graphene acts as a tunable absorber, while the upper layer functions as a transparent gate electrode. Calculations based upon realistic graphene material properties and the optical path amplification of micro-ring waveguide resonator show that 3 dB bandwidths over 100 GHz are achievable at near =1.55 m. In addition, the structure of micro-ring waveguide resonator can be easily integrated with optical Wavelength Division Multiplexing(WDM) interconnection system, so as to enhance the degree of integration and reduce technical complexity.