Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications

Research on High-speed DPSK and Coherent Optical Communication Systems

Author LuHongWang
Tutor YuJinLong
School Tianjin University
Course Communication and Information System
Keywords DPSK modulation Coherent detection Digital coherent optical receiver Linear optical sampling
CLC TN929.1
Type Master's thesis
Year 2009
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In order to meet the growing demand for bandwidth , commonly used in modern high - speed large-capacity optical transmission technology ary modulation scheme to improve the spectrum utilization . The study shows that the DPSK modulation method exhibit far superior OOK modulation scheme of the transmission performance and a better resistance to non-linear performance . RZ-DPSK is considered to be the modulation method of the next generation of high speed transmission systems Select . Coherent optical receiver ary modulation signal processing techniques and linear optical sampling measurement technology has also become a hot research and development in the field of optical communications . High sensitivity, the receiver of the coherent optical communication system , the transmission of long distance relay , more conducive to make full use of the broadband of the optical fiber , to improve the communication quality . Linear optical sampling technique is suitable for high speed PSK , DPSK optical signal measurement technique, using sampling techniques based on coherent detection of the linear light is measured in the high bit rate PSK, DPSK signal waveform and eye diagram . Therefore , it is necessary depth exploration of the DPSK modulation method and the PSK , DPSK Coherent detection communication system . The papers on the use of arms MZM DPSK signal modulation , the new digital coherent optical receiver system and linear optical sampling technology has done a lot of research , the main work is the following : ( 1 ) to study the use of arms the MZM phase modulator modulated DPSK optical signal and the DPSK optical signal receiving the principle of the the MZDI balanced detection . The use of Optisystem light simulation software simulation DPSK optical signal MZM modulation MZDI - balance detection receiver . (2) study the basic principles of coherent optical detection , schematic design homodyne detection circuit and DSP - based digital coherent receiver , and the derivation of the relevant formulas . ( 3 ) study the linear optical sampling principles and to achieve linear optical sampling conditions and linear optical sampling noise analysis derived formula . ( 4 ) design a linear optical sampling experiments Figure , Figure Hybrid linear optical sampling simulation based on the experimental principle .

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