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Studies On Key Technology In 160Gb/s OTDM System

Posted on:2009-05-29Degree:DoctorType:Dissertation
Country:ChinaCandidate:T J LiFull Text:PDF
GTID:1118360242989828Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
OTDM system is one of the best candidates for high-speed, high capacity optical communication system in the future. The fabrication of OTDM components, chromatic dispersion and polarization mode dispersion (PMD) compensation are key technologies in 160Gb/s OTDM system, which are deeply investigated in this paper and supported by the project of the National High Technology Development Program of China(863 Program)"Research on 160Gbit/s optical transmission technology with several fibers amplified by a pump source"(2007AA01Z258).For the first time, by employing numerical calculation adopting autocorrelation and cross-correlation algorithm, the analysis of interference stability of both Mach-Zehnder multiplexer and Whiteman multiplexer have been performed concerning the effect of spatial coherence and spectrum coherence. Experiments have been implemented to verify the validity of simulation results and furthermore a novel approach for eliminating the interference effect has been found. Starting from vector model, the dependant matrix of polarization used for describing optical time multiplexing system has been build, accordingly some important results of the inner relationship between degree of polarization and intensity of interference field have been concluded, which have instructional significance on designing insensitive polarized 160GHz optical time multiplexing device.160GHz OTDM scheme adopting fiber combined with dimensional optical device and using four beam splitters is proposed and Whiteman interferometer 160GHz optical time division multiplexer with stable performance is successfully manufactured, which has many merits such as high delay precision, good flatness of wavelength and insensitivity of polarization etc. The result shows that many performing properties of the self-made multiplexer are superior to the similar overseas products.An effective way aiming to reduce the reliance of polarization produced in 160GHz OTDM system has also been proposed. The experimental results show that this method has several merits including easy realization, simple structure and remarkable effect on eliminating reliance of polarization etc.The interferential characteristic of self-phase modulation (SPM) and inner band cross-phase modulation (XPM) has been analyzed by employing autocorrelation and cross-correlation algorithm and furthermore some important results of inner relationship between nonlinearity and interference have been concluded, which have instructional significance on dispersion management of OTDM system. Based on 160Gb/s OTDM system, the transmission experiment of dispersion compensation has been demonstrated, establishing the foundation for next research work.After demultiplexing scheme from 160Gb/s to 10Gb/s is proposed, based on spectral hole-burning effect, an improved scheme of online PMD monitoring of base-band radio-frequency (RF) signal has been carried out, solving the electrical bottleneck problem of PMD measurement, expanding the range of PMD measurement. Meanwhile a method has been proposed, applied for online PMD monitoring by using autocorrelation instrument in 160Gb/s system. The experimental results show that this method is verified for the online PMD and dispersion of super-short pulse with femtosecond dimension monitoring. By introducing DIRECT algorithm into the field of PMD compensation, an optimal scheme used for self-adaptive 160Gb/s PMD compensation has been investigated, jointly combining DIRECT algorithm with Hooke & Jeeves algorithm, which considers searching for globally optimal solution as well as the speed of trace and has its merits on faster converging speed and more stable comparing with traditional optimizing algorithms. Dynamic PMD compensation experiment based on 160Gb/s OTDM system has been demonstrated by using self-designed PMD compensator, verifying the performance of self-made PMD compensating device.
Keywords/Search Tags:OTDM, dispersion compensation, PMD compensation
PDF Full Text Request
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