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Research on Modulation Schemes and Automatic Polarization Control Technology in Coherent Optical Communication System

Author: ZhuRan
Tutor: XuKun
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Coherent optical communication system The modulation pattern Phase diversity reception Quadrature Amplitude Modulation Subcarrier multiplexing Automatic polarization control
CLC: TN929.1
Type: Master's thesis
Year: 2009
Downloads: 380
Quote: 1
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Abstract


Compared with the traditional direct detection of the intensity modulation optical communication system , the coherent optical communication system having a high sensitivity, excellent frequency selectivity, multiple modulation pattern application . As a key technology in the coherent optical communication system , the modulation pattern and polarization control technology and the performance of the system are closely related. This paper focuses on the AM signal phase diversity reception , automatic polarization quadrature amplitude modulation ( QAM ) signals in coherent optical communication system , as well as coherent optical system control technology . The papers are as follows: papers presented which can be used to demodulate the AM signal zero differential phase diversity reception technology , that is, zero difference step demodulation technique . The theoretical analysis shows that this technique can be used to eliminate phase noise , and having a good reception sensitivity . Based on the program , the successful implementation rate to 2.5 Gbit / s signal reception , the test results show that the bit error rate of 10 -9 sensitivity of - 24.9dBm . Thesis square QAM modulated signal coherent heterodyne transmission technology , 10GHz IF, Single 2.5Gbit / s signal transmission sensitivity in the bit error rate of 10 -8 - 21.4dBm . On this basis, the paper also proposed a coherent QAM ??subcarrier system , a detailed theoretical analysis of its the spectrum utilization phase noise tolerance , the analysis results show that the system has good spectral efficiency , for 4 -QAM QPSK signal, i.e. the signal can reach above 0.8bit/s/Hz . 3 papers to achieve automatic polarization control techniques for coherent optical communication system . Arbitrary polarization state of the technology can be received within 10 seconds to signal change linearly polarized light output fixed , and remain stable . The optimized polarization algorithm can be restored within 4 seconds . Stable state of polarization will be ongoing tracking, slight fluctuations in the recovery time in the order of milliseconds .

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