Research On Dispersion Compensation Fiber And Module

Dispersion Compensation Module(DCM) will become essential device in Dense Wavelength-Division Multiplexing (DWDM) all-optical transmission networks. Among all the operating mechanisms, those based on dispersion compensation fiber are promising and have been receiving more and more attention in recent years. In this dissertation, we focus on dispersion compensation fiber and module. Several theoretical and experimental studies have been carried out as the followings:(1) Theoretical basis for transmission capacity limited by dispersion and dispersion compensation are investigated. Refractive index configuration model of fiber is established for theoretical simulations. Based on the model, the effect on fiber dispersion caused by refractive index copnfiguration and dispersion properties of dispersion compensation fiber are analyzed theoretically. These theoretical simulations are beneficial to optimize the performance of dispersion compensation module.(2) With the dispersion compensation modules fabricated by our laboratory, 32*10Gbit/s DWDM with 3040km transmission length has been demonstrated. The success of the communication system experiment approves that our dispersion compensation module meets the requirement of DWDM. It has passed the identification presided by the Chinese Ministry of Science and Technology.(3) The fiber refractive index parameters and fiber fabrication process are researched deeply. Dispersion compensation fiber with high Figure of Merit(FOM) are developed. Fiber characters and parameters have reached the international level of the same product, some are even better than that level.(4) Method of fiber splicing with transition fiber and material diffusion are presented. Based on this method, modes with different diameters are matched and therefore the splice loss between DCF and regular fiber is reduced. The splice loss is as small as 0.5dB and the insersion loss of the dispersion module is optimized.(5) Therical model of fiber bending loss is established. The relationship between fiber bending performance and fiber refractive index is calculated to find the best path of optimizing bending performance. Benefitted from the simulation, average bending loss of 0.30dB/km in dispersion compensation fiber at different wavelength band is reached.(6) Basic theory of dispersion compensation fiber working at high-order-mode is studyed. The fiber refractive index of high-order-mode dispersion compensation fiber is analyzed. Based on the analyzing, dispersion compensation fiber and dispersion compensation modules are fabricated. With the modules, transmission experiment is implemented successfully.