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Research On Chromatic Dispersion And Polarization Mode Dispersion Measurement Methods

Posted on:2018-01-03Degree:MasterType:Thesis
Country:ChinaCandidate:Y LiFull Text:PDF
GTID:2348330518996067Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
With the arrival of the 5G and "Internet +" era, a variety of devices get access to internet by wired and wireless methods. The rate of data service is becoming more and more big. And optical communication system has great advantages of large transmission capacity and long transmission distance. So it becomes one of the best solutions to solve the problem of high rate transmission. At present, WDM and coherent optical communication technology are applied into optical fiber communication system.and they contribute a lot to the rapid development of optical communication system. What's more, single channel information rate 400Gbit/s, even 1 Tbit/s has gradually become the development trend of commercial system of the next generation.Due to the large scale use of optical fiber in communication system and increasing rate of optical communication system, chromatic dispersion and polarization mode dispersion characteristics in fibers are becoming the key factors that affects the performance of the communication system.Dispersion and polarization mode dispersion measurement are of great significance. we can not only carry on the quality inspection to the large factory optical fiber, but also monitor the quality of the communication link to determine whether to upgrade or repair the lines by measuring the dispersion and polarization mode dispersion of fibers. So chromatic dispersion and polarization mode dispersion test instrument has a good market prospects. At present, the dispersion and polarization mode dispersion measurement methods are mature, but the research on the test instrument and its measurement scheme is very few in China. What's worse,very little manufacturers are involved in the design and manufacture of the instrument in our country.According to the present situation of chromatic dispersion and polarization mode dispersion measurement and the demand of low cost and high precision measuring instruments, it is very important to research the test instrument and its measuring methods.This paper focuses on the measurement scheme of chromatic dispersion and polarization mode dispersion test instruments in single mode fiber. Researchs are as follows:(1) The advantages and disadvantages of the current measurement methods are analyzed and compared. Advices for dispersion and polarization mode dispersion measurement scheme in the metropolitan area are provided.(2) According to the measurement requirements of chromatic dispersion in the metropolitan area network, a scheme of dispersion measurement based on digital phase detection is proposed. The simulation platform based on OptiSystem and MATLAB is built and the effect is verified. The simulation results verify the correctness of scheme and high precision of digital phase phase detector. Corresponding experimental system was set up, experiment results show that the accumulated chromatic dispersion accuracy of different length G.652 fiber at 1550nm are less than 10ps/nm, which are better than the commercial CD analyzer for metropolitan area network environment. And the measurement cost. is reduced.(3) According to the measurement requirements of polarization mode dispersion in the metropolitan area network, we improve the fixed analysis method and a polarization mode dispersion measurement scheme based on particle swarm optimization algorithm is proposed. The corresponding experimental system was set up, PMD measurement result shows that the average error is less than 0.2ps. The schme is of high repeatability and is easy to implement. What is more, Gauss cueve fitting algorithm based on particle swarm optimization not only ensures the measurement accuracy,but also improves the measurement speed.
Keywords/Search Tags:optical communications, chromatic dispersion measurement, polarization mode dispersion measurement, digital phase detection, particle swarm optimization algorithm
PDF Full Text Request
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