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Investigation on Demodulation and Transmission Characteristic of DPSK Signals

Author: QiMing
Tutor: ZhangXinLiang
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: Optical communication Differential phase shift keying demodulator Mach - Zehnder interferometer Transmission characteristics
CLC: TN911.3
Type: Master's thesis
Year: 2007
Downloads: 570
Quote: 8
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Abstract


Differential phase shift keying modulation formats (DPSK) as a new modulation format has become a research hotspot in recent years, high-speed long-haul optical communication technology . DPSK modulation and demodulation techniques and transmission characteristics in the Ministry of Education for New Century Excellent Talents Scheme funded more complete theoretical analysis and experimental research , and produced an adjustable Mach - Zehnder interferometer DPSK demodulator devices . The main work can be summarized as follows : ( 1 ) DPSK modulation format research significance of the the DPSK transmission research status and DPSK demodulation . (2) For DPSK modulation principle analyzed to obtain a non - return-to-zero differential phase shift keying (NRZ-DPSK), zero differential phase shift keying (RZ-DPSK) and carrier suppression zero differential phase shift keying ( CSRZ-DPSK) three DPSK modulation format theoretical expressions , and DPSK format by the numerical simulation of the time-domain waveform and frequency domain spectroscopy , and the corresponding off Keying (OOK) is analyzed and compared . ( 3) of the DPSK demodulation principle analyzed to derive the transfer matrix of the Mach - Zehnder interferometer , and numerical analog understand the adjustment process . Optical communication simulation software to analyze and compare the impact of the structural parameters of the Mach - Zehnder interferometer for DPSK demodulation results . The DPSK demodulator developed based fiber Mach - Zehnder interferometer (4) , wherein the temperature control the temperature control system for the fiber arm . 40Gbit / s DPSK signals are demodulated successfully achieved in the experiment , the temperature control to achieve an output result of long and stable , and can be converted in constructive interference and destructive interference between . (5 ) two aspects of the the DPSK format anti nonlinear effects and anti- dispersion ability to carry out simulation study and comparison of three different dispersion compensation schemes DPSK transmission characteristics . Completed the rate of 40Gbit / s , back - to - back and 100km fiber transmission experiment, measurement of the different bit rates , the reception performance of the DPSK signal to be compared , and the transmission performance of DPSK and OOK .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Modulation theory
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