【摘要】 本文提出了一种在波分复用无源光网络(WDM-PON)中传输模拟或数字有线电视(CATV)信号的高性价比的方法,并对CATV信号在其中传输的性能进行了详细的分析。建立了包括宽带光纤放大器自发辐射(ASE)光源、马赫—曾德尔调制器、滤波器、传输光纤、光电探测器等的基本光链路分析模型,着重分析调制深度、平均接收功率和ASE分割带宽对信噪比的影响;理论分析和数值仿真表明,在满足传输电视信号传输带宽750MHz的前提下,信噪比在43dB以上,满足光纤到户传输要求。实验结果表明,加入EDFA可以有效抑制相对强度噪声,使信噪比提高3～4dB。更多还原

【Abstract】 A cost-effective approach for Cable Television (CATV) signal transmission over a Wavelength Division Multiplexing Passive Optical Network (WDM-PON) is proposed and CATV signal transmission performance is analyzed in detail. The analytic models for a fundamental optical link,consisting of optical amplifier spontaneous emission (ASE) source, Mach-Zehnder Modulator, optical filter, transmission fiber and photodiode,are presented. Considering a variety of system noises’ influence on the transmission performance of CATV signal, the analysis concentrates on the impact of optical modulation depth, average received optical power and ASE spectrum-sliced bandwidth on Signal-to-noise Ratio (SNR). The numerical analysis shows that SNR can reach above 43 dB at the bandwidth of 750 MHz, thus meets the need of CATV transmission over fiber to the home. From the experiment result, it is seen that EDFA can effectively suppress the relative intensity noise, improving SNR by 3~4 dB.更多还原