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

Study on the Technology of Generation and Transmission for Optical Packets Based on OFDM in Optical Label Networks

Author ZhangChaoLi
Tutor ChenLin
School Hunan University
Course Information and Communication Engineering
Keywords Optical Fiber Communication Optical label switching Orthogonal Frequency Division Multiplexing Quadrature modulated light marks Phase Modulation Intensity modulation Coherent detection
CLC TN929.1
Type Master's thesis
Year 2010
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All-optical switching technology is the most promising next generation communications network switching technology that provides high-speed, high-capacity transmission and processing capability, the transmission of information to break the \requirements. For the current state of technology and devices exchange level of development, with the current electronic device processing technology advantages, it presents a photovoltaic hybrid optical packet switching - optical label switching technology, which is all-optical networks to achieve the most effective way. Based on such a background, the light marking and optical packet generation, exchange, transmission and other related technologies, carried out some theoretical analysis, simulation and experimental research, the main contents are as follows: First, the proposed and experimental study of a Orthogonal Frequency Division Multiplexing (OFDM) signal as a marker of new optical packet transmission scheme. Orthogonal frequency division multiplexing optical communication can resist the dispersion effect of the introduction of OFDM optical label switching system with anti-dispersion, interference, many advantages of higher spectral efficiency, to achieve long-distance signal transmission. Experiment, 10Gb/sOOK loads and 2.5Gb/sOFDM mark respectively, through the intensity modulator at different wavelengths modulated optical carrier, and then generate coupler coupled optical packet. After transmission after 40km single mode fiber, at the receiving node will load and run out interleaver stamp separation were detected with the corresponding receiver. Experimental results show that the optical packet signal transmitted through the optical fiber, the recovery still good load signal and flag signal, the power loss is small, suitable for long distance transmission. The program is simple, labeled with separate load modulation, without limitation extinction ratio, crosstalk is not obvious, easy to implement marking and load consolidation and separation. Second, the proposed and simulation of a orthogonal frequency division multiplexing (OFDM) signal and a phase shift keying (PSK) signal combining new labeling scheme quadrature modulated light. Generating an intensity modulated signal 2.5Gb/sOFDM mark, the phase modulation of the 10Gb / s payload signal on the same optical markers and the OFDM carrier quadrature PSK modulation of the load, generating optical packet signal for transmission through single-mode fiber, used at the receiving node to receive the respective detection methods. OFDM signals can help overcome the influence of the dispersion, the PSK signal intensity is constant, non-linear effect can be effectively suppressed. Therefore, this quadrature modulator optical label scheme, will further efficient transmission of the signals. Theoretical analysis and simulation have proved the feasibility of the program. The program has a simple configuration, high spectral efficiency, suitable for long distance transmission and other characteristics.

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