在5G网络中,用户数据通过超密集基站汇集成大数据包,这些数据包被异步交换体制的密集波分复用(DWDM)系统中的掺铒光纤放大器(EDFA)放大时,会产生信道间串扰,导致数据包的误码率(BER)恶化。在测定EDFA增益恢复时间的基础上,对BER恶化进行了深入研究。推导了串扰引起的BER计算公式,讨论了影响BER的因素,搭建了大数据包串扰的实验装置。理论和实验结果表明,一个信道数据包的包长和光功率越大,对另一个信道数据包BER的影响也越大,当数据包的包长小于5 μs时,串扰对BER的影响是可以忽略的。

In 5G networks, user data will assemble larger packets through ultra-dense base stations. When these packets are amplified by erbium-doped fiber amplifier (EDFA) in the dense wavelength division multiplexing (DWDM) system using an asynchronous switching system, interchannel crosstalk will occur and the bit error rate (BER) of the data packets will be deteriorated. Based on the measurement of gain recovery time of EDFA, the BER deterioration is studied in depth. The calculation formula of BER caused by crosstalk is derived, and the factors that influence BER are discussed. An experimental device of large data packet crosstalk is set up. Both theoretical and experimental results show that the greater the packet length and optical power of the data packet in one channel, the greater the effect on the BER of the data packet in another channel. When the packet length is less than 5 μs, the effect of crosstalk on the BER is negligible.