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Noise and distortions limitations in the design of HFC CATV systems

机译:HFC CATV系统设计中的噪声和失真限制

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摘要

The paper deals with HFC CATV systems. System parameters determinative in obtaining the desired carrier-to-noise ratio (CNR) and acceptable nonlinear distortions are considered. Formulae for the gain and the maximum number of RF amplifiers in the longest coaxial trunk line are developed. A mathematical model of the optical channel is suggested that makes it possible for the signal minimum level at the optical receiver input to be calculated if the value of CNR and the number of TV channels transmitted are known. Analytical expressions to determine the RF signal voltage in the input and output of the optical line are given that take into consideration the nonlinear distortions in the laser transmitter, the number of TV channels and the losses within the optical fiber and passive elements. Experimental results are given to illustrate the application of the formulae in the design of a HFS system section.
机译:本文涉及HFC CATV系统。考虑了确定所需的载噪比(CNR)和可接受的非线性失真的系统参数。开发了最长同轴干线上的增益和最大射频放大器数量的公式。建议使用光通道的数学模型,如果已知CNR的值和传输的电视通道的数量,则可以计算光接收器输入端的信号最小电平。给出了确定光线路输入和输出中的RF信号电压的解析表达式,其中考虑了激光发射器中的非线性失真,TV频道数以及光纤和无源元件内的损耗。实验结果说明了这些公式在HFS系统部分设计中的应用。

著录项

  • 来源
    《Optical fiber technology》 |2006年第2期|p.196-204|共9页
  • 作者

    Dobri Dobrev; Lidia Jordanova;

  • 作者单位

    Department of Radioengineering, Faculty of Communications Engineering and Technologies, Technical University of Sofia, 8 'Kliment Ohridski,' 1756 Sofia, Bulgaria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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