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Research On All Optical Dispersion Monitoring Device Based On Four Wave Mixing

Posted on:2012-07-16Degree:MasterType:Thesis
Country:ChinaCandidate:L LiFull Text:PDF
GTID:2248330392956255Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
To meet the increasing demands of the broadband application services, optical networkis developing toward the direction of Ultra-high speed and dynamically reconfiguration. Butas the transmission rate increases from10/40Gbit/s to100Gbit/s, the system dispersiontolerance reduce rapidly which makes the precise chromatic dispersion (CD) monitoring andcompensation increasingly important. Dispersion monitoring device can provide accurateinformation of the dispersion experienced by the signals, thus a tunable dispersioncompensator can use to compensate CD adaptively, which is essential to mitigate the CDdistortions which may changes due to optical network reconfigurations and temperaturevariations.In this thesis we demonstrate a method utilizing phase-matched four-wave mixing(FWM) to realize highly sensitive dispersion monitoring. Based on the theory of FWM, thenumerical model of the monitor is setup. We also prove that the dispersion monitoringsensitivity is proportional to the slope of the power transfer function (PTF) and with properlyselected phase-matching conditions an exponential PTF can be obtained. VPI simulationsoftware package is utilized to simulate the variations of the signals and the device. Thevariations against CD of the signals in different modulation formats in the time domain andfrequency domain are compared, and then the monitoring results is analyzed and optimizedto improve the sensitivity of dispersion monitoring. Compared with the previous works, thedispersion monitoring device proposed in this thesis is transparent to modulation formats andtransmission rates. Thanks to the much faster increasing slope of the exponential function,the output contrast and monitoring sensitivity are greatly enhanced, especially for high dutycycle signals. Based on these results we setup an experiment system to observe the FWM inhigh nonlinear fiber and obtain the PTF which to verify the validity of the theoreticalanalysis above. This thesis also studies the impacts of PMD and OSNR. To eliminate theinfluence of them and expand the range of dispersion monitoring, a method of combiningradio frequency measuring and tunable dispersion compensation device is discussed...
Keywords/Search Tags:Phase-matched, Four-wave Mixing (FWM), Dispersion monitor, Power Transfer Function (PTF)
PDF Full Text Request
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