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A novel coherent heterodyne system for square Cheap Lacoste Polo Shirts is proposed. In the experiment, a 2.5Gbit/s PRBS with the intermediate frequency (IF) of chi straightener is transmitted. The sensitivity is -21.4dBm when the bit-error-rate (BER) is 10-8 . Based on this scheme, a coherent QAM subcarrier multiplexing system is presented. The theoretical demonstration and simulation are given for the analysis of the spectral efficiency and tolerance of linewidth. The simulation result shows its spectral efficiency achieve more than polo shirts.3. An automatic polarization controller technology used in the coherent optical communication system is presented in the dissertation. The random polarization of received optical signal can be transformed into a steady fixed linear polarization in 10 seconds. After the hair straighteners optimization of the algorithm, the time can be limited in 4 seconds. The circuit and algorithm designs are detailed introduced in the Lacoste Polo dissertation. The tiny fluctuation of polarization can be eliminated in several milliseconds.
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