Research On Dispersion And Nonlinearity Properties Of Mid-infrared Glass Microfibers

Mid-infrared nonlinear optoelectronic devices with low loss and controllable dispersion have important applications in optical communication,optical sensing and other fields.Recently,the photoelectric conversion ability lags and the electronic link speed limit has become the bottleneck of information transmission technology and the key to solve the problem is the development of new nonlinear ultrafast photonic devices.With the miniaturization and highly integration of optoelectronic devices,The waveguide has entered the sub-micron or even nanometer scales.The dispersion and nonlinear characteristics determine the behavior of the pulse transmission and at the same time,the performance of the micro-nano photonics devices.Based on the mid-infrared low loss fluoride and chalcogenide glass materials,The paper is researched on the waveguide dispersion and nonlinearity properties for them,The results of the research have guiding role in the development of mid-infrared nonlinear photonic devices.(1)We have numerically discussed the waveguide dispersion and nonlinearity properties of fluoride ZBLAN microfiber.The results suggests that by optimizing the core size and numerical aperture,we can obtain the 2~5 μm wide wavelength band compensation.The numerical results find that when the air-cladded ZBLAN is designed with core size 2 μm,we can get the large dispersion 6243 ps2/km at wavelength of 4 μm.Then we analyze the dispersion properties of the microfibers with one thin dielectric layer and find that when 1-μm-coresize ZBLAN is cladded with 5-nm-thick Ge11.5As24S64.5 calcogenide glass,the dispersion can get 4411 ps2/km near wavelength of 2.55 μm。(2)Then we numerically discusses the relationship between waveguide dispersion,nonlinear coefficient and waveguide parameters of Ge11.5As24Se64.5 microfiber.The results show that by changing the waveguide parameters,the waveguide dispersion can be tuned in a large range,and obtains near-zero flattened dispersion at wavelength of 3 μm.The research achievements provide reference for the dispersion-controlled nonlinear optical devices and realizing wide flattening mid-infrared supercontinuum in the microfiber.