本文選題：正交頻分復(fù)用　切入點(diǎn)：光纖通信　出處：《長春理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：基于OFDM的光纖通信系統(tǒng)具有光通信和OFDM技術(shù)的雙重優(yōu)點(diǎn),光OFDM技術(shù)不但具有較高的頻譜利用率,而且還具有較強(qiáng)的抗非線性能力、抗偏振模色散的能力和抗色度色散的能力。光OFDM技術(shù)是大容量、高速率和超長距離的光纖通信系統(tǒng)中的關(guān)鍵技術(shù),所以光OFDM技術(shù)是當(dāng)前的研究熱點(diǎn)。 本文主要研究了直接檢測光OFDM (DDO-OFDM)系統(tǒng)、相干檢測光OFDM (CO-OFDM)系統(tǒng)和偏振復(fù)用相干檢測光OFDM (PDM-CO-OFDM)系統(tǒng)的發(fā)射機(jī)與接收機(jī)的原理、結(jié)構(gòu)和相關(guān)技術(shù),分析了光纖信道的傳輸特性,利用Optisystem和Matlab搭建了DDO-OFDM系統(tǒng)、CO-OFDM系統(tǒng)和PDM-CO-OFDM系統(tǒng)仿真平臺；在DDO-OFDM系統(tǒng)中,分析了不同色散系數(shù)對傳輸距離的影響和不同子載波數(shù)對系統(tǒng)性能的影響。為了提高DDO-OFDM系統(tǒng)的接收機(jī)靈敏度,設(shè)計(jì)了CO-OFDM系統(tǒng),在CO-OFDM系統(tǒng)中,對不同子載波數(shù)目、不同調(diào)制模式和不同差分群時(shí)延(DGD)對系統(tǒng)性能的影響進(jìn)行仿真分析。為了增大系統(tǒng)容量,將偏振復(fù)用技術(shù)引入到了CO-OFDM系統(tǒng)當(dāng)中,在PDM-CO-OFDM系統(tǒng)中,對適當(dāng)選取子載波數(shù)和調(diào)制方式可以使PDM-CO-OFDM系統(tǒng)的性能非常優(yōu)越進(jìn)行仿真與分析；最后對單偏振CO-OFDM系統(tǒng)和PDM-CO-OFDM系統(tǒng)的仿真結(jié)果進(jìn)行對比分析。
[Abstract]:Optical fiber communication system based on OFDM has the dual advantages of optical communication and OFDM technology. Optical OFDM technology not only has high spectral efficiency, but also has strong anti-nonlinear ability. Optical OFDM technology is a key technology in large capacity, high speed and super long distance optical fiber communication systems, so optical OFDM technology is a hot research topic at present. In this paper, the principle, structure and related techniques of transmitters and receivers of direct detection optical OFDM DDO-OFDM system, coherent detection optical OFDM CO-OFDM system and polarization-multiplexed coherent detection optical OFDM PDM-CO-OFDM system are studied, and the transmission characteristics of optical fiber channel are analyzed. The simulation platform of DDO-OFDM system, CO-OFDM system and PDM-CO-OFDM system is built by using Optisystem and Matlab. In DDO-OFDM system, the influence of different dispersion coefficients on transmission distance and the influence of different number of sub-carriers on system performance are analyzed. A CO-OFDM system is designed. In CO-OFDM system, the effects of different subcarriers, different modulation modes and different differential group delay on the performance of the system are simulated and analyzed. Polarization multiplexing technology is introduced into CO-OFDM system. In PDM-CO-OFDM system, the performance of PDM-CO-OFDM system can be simulated and analyzed by selecting the proper number of sub-carriers and modulation mode. Finally, the simulation results of single polarization CO-OFDM system and PDM-CO-OFDM system are compared and analyzed.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.11

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