FM-FDM Optical CATV Transmission Experiment and System Design for MUSE HDTV Signals
FM-FDM Optical CATV Transmission Experiment and System Design for MUSE HDTV Signals
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MUSE HDTV信号的FM-FDM光CATV传输实验及系统设计
DOI：
10.1109/49.59125
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Makoto Yamamoto
中科院分区：
文献类型：
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作者：
M. Maeda;Makoto Yamamoto
FM-FDM（频分复用）光传输设备是针对34路MUSE HDTV（高清晰度电视）信号开发的，以实现光CATV（有线电视）系统。该设备使用一个LD（激光二极管）与1.3 μ m波长，单模光纤，和雪崩光电二极管（APD）。在42公里的传输后收到了良好的图像。复用信号的一部分在LD的阈值附近或以下失真。当传输信道的数量很小时，总的光调制深度很大，这种非线性决定了FM信号与一个失真分量的功率比-DU比。然而，当传输信道的数量大时，DU比由有效光调制深度而不是总光调制深度确定。最后，以光干线CATV系统为例，阐明了系统设计的方法。如果对光学设备的传输带宽不存在限制，则100信道MUSE HDTV信号的大约30 km传输可用，接收CN比为17.5 dB。>
FM-FDM (frequency division multiplexing) optical transmission equipment has been developed for 34-channel MUSE HDTV (high-definition television) signals to realize optical CATV (cable television) systems. The equipment uses an LD (laser diode) with a 1.3 mu m wavelength, a single-mode optical fiber, and an avalanche photodiode (APD). A good picture is received after a 42 km transmission. A part of the multiplexed signals is distorted near or below the threshold of an LD. When the number of transmission channels is small and the total optical modulation depth is large, this nonlinearity governs the power ratio of an FM signal to one distortion component-the DU ratio. However, when the number of transmission channels is large, the DU ratio is determined by the effective optical modulation depth rather than the total optical modulation depth. Furthermore, the method of system design is clarified for an optical trunk line CATV system. If no restriction on the transmission bandwidth of optical devices exists, approximately 30 km transmission of 100-channel MUSE HDTV signals is available with a received CN ratio of 17.5 dB. >