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Research On Fiber Dispersion And Nonlinearity Measuring Technology For High-Speed Fiber Communication Systems

Posted on:2017-03-31Degree:MasterType:Thesis
Country:ChinaCandidate:C HeFull Text:PDF
GTID:2348330509460291Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
With the development and penetration of recent high-bandwidth network service including distant education, video conference and interactive game and the design of future Internet of Things and big data analysis, a severe requirement needs to be satisfied on the transmission distance and bit rate of current optical fiber transmission system. As the most promising techniques, the current emerging higher modulation formats based on Digital Signal Processing and the Multi-dimension Multiplexing techniques are extremely sensitive to chromatic dispersion and nonlinear effects, thus the researches on monitor and compensation of chromatic dispersion and nonlinear effects are needed in the optical fiber transmission field. This thesis aims at the study on theories of chromatic dispersion and nonlinear impairment at high bit rate optical fiber transmission system, and then proposes methods for the chromatic dispersion and nonlinear impairment monitoring.Firstly, the mechanisms of chromatic dispersion and nonlinear effects including Self-phase Modulation(SPM), Cross-phase Modulation(XPM) and Four-wave Mixing(FWM) in high speed optical fiber are detail described in this thesis, which are the foundation for the later impairment monitoring content. Secondly, a novel dispersion measuring technique based on the second order lowest power of Radio Frequency(RF) signal is studied and demonstrated in this thesis in order to meet the need of the precise compensation of chromatic dispersion in optical fiber link with long distance and high bit rate. Through theoretical analysis and simulation, it is found that the method can realize the dispersion of 1750 ps/nm monitoring with error in the range of 10ps/nm, which can satisfy the need of high speed and long distant system. At last, this thesis studies the nonlinear effects: on the one hand, a method is proposed to monitor the effect of Cross-phase Modulation on Intensity Modulation/ Direct Detection system. The influence of Cross-phase Modulation effect on the optical signal in the optical fiber link is theoretical analyzed based on Nonlinear Schr?dinger wave equation. And then software VPI is applied to simulate the normalized Cross-phase Modulation function in Intensity Modulation/ Direct Detection optical fiber communication system. On the other hand, a novel nonlinear phase noise monitoring method based on electronic orthogonal coherent for 160 Gb/s PDM-4 QAM system is proposed and simulated. The compensation simulation results show that the optimum launch power improves 3.5 d B with nonlinear phase noise compensation under this nonlinear impairment monitoring method.
Keywords/Search Tags:Optical fiber communication, Chromatic dispersion, Nonlinearity effects, Cross-phase modulation, Schr?dinger wave equation
PDF Full Text Request
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