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论述了1550 nm射频电视(CATV)通道与1490 nm数据通道的相互干扰问题。针对1490 nm光波通过光纤中受激拉曼效应对1550 nm光波的非线性串扰和1550 nm光波通过粗波分复用(CWDM)分波器对1490 nm光波的线性串扰提出了理论计算公式,进行了定量分析和计算。结果表明,数据非线性串扰可使射频电视系统低频端的载噪比下跌9 dB;而在常规融锥型粗波分复用分波器情况下,射频电视线性串扰可使数据光接收机的光功率代价达到2.5dB。最后指出了克服串扰的方法,如以太空闲字符扰码和高隔离度粗波分复用等。
The interference of 1550 nm radio frequency television (CATV) channel and 1490 nm data channel is discussed. Aiming at the nonlinear crosstalk of 1590 nm light wave caused by stimulated Raman effect of 1490 nm light in fiber, and 1550 nm light wave, a theoretical calculation formula of linear crosstalk of 1490 nm light wave by coarse wavelength division multiplexing (CWDM) Quantitative analysis and calculation. The results show that the data nonlinear crosstalk can reduce the carrier-to-noise ratio of the low frequency end of the radio frequency television system by 9 dB. In the case of the conventional cone-shaped coarse wavelength division multiplexing demultiplexer, the linear crosstalk of the radio frequency television can make the data light receiver light Power cost reached 2.5dB. At last, the methods of overcoming crosstalk are pointed out, such as space idle character scrambling code and high isolation coarse wavelength division multiplexing.