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Multi-level Phase Modulation Formats and Their Polarization Mode Dispersion Performance in High Speed Fiber-optics Communication System

Author: ZhaoZuoZuo
Tutor: ZhangXiaoGuang
School: Beijing University of Posts and Telecommunications
Course: Physical Electronics
Keywords: Optical fiber communication Pattern modulation 8-DPSK Dual polarization state of DPSK Dual polarization state of the DQPSK PMD compensation The stability of the state of polarization
CLC: TN929.11
Type: Master's thesis
Year: 2010
Downloads: 94
Quote: 3
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Abstract


Currently, optical fiber communication system is moving in the direction of the high-rate, large capacity. Backbone network transmission rate increase, making the fiber chromatic dispersion, nonlinearity and polarization mode dispersion signal can no longer be ignored. In recent years, a variety of higher tolerance of the new modulation formats have been proposed. Meanwhile, with the rate of increase of the system, essential for the mitigation of polarization-mode dispersion, the need to have a high response speed, a stable adaptive compensation of polarization mode dispersion. Moreover, with partial multiplexing systems and coherent communication system development, it is necessary at the receiving end introducing the stabilizing device of the state of polarization. For each of the three aspects of the new modulation format, fiber PMD compensator, optical signal polarization state stabilization device theory, simulation and experimental study. The main work of this dissertation are as follows (boldface innovative work): condensed review of the pattern of light modulation technology used in optical modulation Mach - Zehnder modulator of principle; through theory and simulation analysis DQPSK signal time domain and frequency domain characteristics, a constellation diagram, the phase difference diagram, eye diagram and different duty cycle signal spectrum. Review of the related concepts of the polarization state of the optical signal, and Polarization Mode Dispersion mechanism and the compensation method, described in detail the optical domain compensation method. Theoretical analysis of optical 8-DPSK modulation format, the demodulation principle; build a simulation system, the analysis of the time domain and frequency domain characteristics, including the constellation diagram, the phase difference diagram, eye diagram and different duty cycle signal spectrum ; Fig on the basis of the \From the theoretical analysis of light dual polarization states DPSK signals and dual polarization state DQPSK signal modulation, demodulation principle; build a simulation system, analysis of the time-domain and frequency-domain characteristics, including the constellation diagram, the phase difference diagram, eye diagram different duty cycle signal spectrogram; simulation polarization mode dispersion tolerance of the two modulation format; build experimental system of dual polarization state DPSK format, dual polarization state for the first time on the experiment DPSK signals . PMD compensator applied to DPSK and DQPSK systems have been used as a feedback signal the DOP and reaction link in first-order polarization mode dispersion component DGD curve, as well as information reaction DOP DOP map; through The experimental verification of the performance of the compensator to compensate for the eye diagram of the signal before and after, and verify the performance of the on-line tracking of the compensator. Proposed a new polarization state of stabilization program, may be polarization-state transition of the input optical signal to an arbitrary output polarization state, and the output signal is stabilized at the target polarization states; verified by experiments that the performance of the solution, respectively, to the computer system and DSP system as the central processing unit, to verify the state of polarization conversion capabilities of the program and online tracking capabilities.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications > Optical fiber communication
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