The Research Of Fiber Doped With Nano-Semiconductor Based On ALD Technology

As a core element of information, Doped fiber has a wide range of applications in the aerospace, military defense, industrial production. However, with the rapid development of optical communication technology, the existing optical fibers have been unable to meet the wide-broadband, high-speed communication needs. Therefore, to improve the optical radiation bandwidth of the amplification fiber, amplification efficiency, gain and other properties, some innovation should be made in the doped materials and doped technology. This has become an urgent issue to study and solve.This thesis reviews he work in the area of doped special fibers firstly. Combining the nano-technology with the fiber fabrication process, to manufacture new optical fiber doped with nano-materials. And we successfully produced special fiber doped with InP by modified chemical vapor deposition (MCVD). By the detection the doping concentration and the uniformity of the doped materials, we found that the fiber produced by MCVD has a low doping concentration, low doping efficiency and less uniformity of doping materials. Therefore, this thesis proposed a new method to produce new doped fiber, which integrating the atomic layer deposition (ALD) and the fiber preparation process. And this will overcome the problems which existed in the MCVD process. As the need of optical communications, PbS has much greater optical radition band than 1310nm to 1550nm, so PbS was chosen as doped source. In this thesis, the author has theoretically calculated the relationship of band gap energy versus particle sizes, and got the PbS particle size was 3.24nm in 1550nm wavelength of light. Based this, the special fiber model structure was designed. By using the finite element method (FEM) method, the electric field has been simulated. And as a contrast, single-mode fiber with the same parameters was also simulated. From the result, we found that the electric field of the special fiber has dropped. So,a higher power pumping light should be added if the special fiber is used as amplifying fiber.In the end, the thesis presents a positive outlook on the potential application of the nano-material doped fiber in the future.