基于相位调制器的光载OFDM信号产生和传输系统

光正交频分复用（OOFDM）是目前宽带通信领域的研究热点，它和光纤无线通信（ROF）系统相结合可以更好地克服色散，提高ROF系统的性能。提出一种基于相位调制器的光载OFDM信号产生和传输系统。在中心站采用相位调制器结合光滤波器产生载波抑制-双边带（DSB-SC）光载毫米波，将OFDM信号调制到一个边带上进行传输。建立了光载OFDM信号的产生模型，分析了光纤色散导致的相位影响，并通过仿真实验验证了系统的可行性。结果表明，经95km光纤传输后，系统的眼图仍清晰张开。

Generation and transmission system of optical millimeter-wave carrying OFDM signal based on phase modulator

OOFDM(Orthogonal Frequency Division Multiplexing) is a focus in research of broadband communications now.The combination of OFDM with ROF(Radio Over Fiber) system can overcome optical dispersion and improve the performance of ROF system.A generation and transmission system of optical millimeter-wave carrying OFDM signal based on phase modulator was proposed.In the center station,Double SideBand with Suppressed Carrier(DSB-SC) optical millimeter wave signal was generated utilizing phase modulator along with optical filter,while OFDM signal was modulated only onto one of the two optical carriers and transported along optical fiber.The paper set a model about optical carrier OFDM generation and analyzed fiber dispersion influence on phase,and proved the feasibility of the system through the simulation test.The result show the system’s eye chart is very clear over 95 km optical fiber.