Research On The Optical Properties Of Four-Wave-Mixing Based On Graphene Coated Micro-Fiber Waveguide

Nonlinear optical effect is one of the popular research focuses in the fields of optical fiber communication and sensing. On the one hand, these non-linear effects in the fiber would have negative effects on the performances of the optical fiber system; on the other hand, a number of new frequency components that generated in the four-wave mixing process could optimize and extend the performances of numerous optical devices. Optical nonlinear effects including the four-wave mixing will be generated when the light beams transmit along the optical fiber in phase-matching condition. As a result, the four-wave mixing process generated in fiber and its applications have been a hot research project world-widely in the field of fiber nonlinearity.Graphene, as a new type of two dimentional material, has attracted huge interest of researchers since it emerges. It has been revealed that graphene is a new ideal non-linear optical material with unique optical properties such as the ultra-high non-linear coefficient in a very wide spectral range and ultra-high optical nonlinearity. Hence, analysis of the optical nonlinearity and devices with the combination with graphene and optical waveguide structure in micro-nano-scale would not only contribute to the development of non-linear optics but also has reference value for the research of new photonic device benefits based on the structure of micro-fiber waveguide coated with graphene.The paper studies the four-wave mixing with the hybrid waveguide in which graphene film grown by using chemical vapor deposition is coated on the micro-fiber utilizing wet-transfer technology. Due to graphene’s enhancement effect for evanescent field and broad spectrum response of high nonlinearity, four-wave mixing effect can be generated based on graphene coated microfiber by carefully designing the hybrid waveguide’s structural parameters and analysis of its dispersion in order to achieve the phase matching condition.In this work, the nonlinearity, transmission properties, excitation and transfer efficiency of four-wave mixing based on graphene coated micro-fiber have been investigated in theory and by experiment. The main accomplishments are as follows:(1) The design and fabrication technology of graphene coated micro-fiber waveguide and its wave guiding properties.(2) Analysis of the third-order nonlinear optical effect of graphene and the interrogation of four-wave mixing based on graphene coated micro-fiber in theory and simulation.(3) Study on generation of four-wave mixing properties, including the design of the four-wave mixing system and test scheme based on graphene coated micro-fiber by using both the high power pulse pump and the femtosecond pulse pump.(4) Analyzing the properties, experiment result and potential applications of the four-wave mixing effects based on graphene coated micro-fiber mentioned above.