In this work we analyse and demonstrate the coexistence of digital coherent and analogue radio over fibre signals over an access-metro transmission network and field fibre. We analyse how the spectral proximity of the two signals and the non-ideal filter alignment of typical telecomms-grade ROADMs affect the signal performance. Our results show that coexistence is indeed possible, although performance deteriorates with the increase in number of ROADMs in the network topology. Thus, while todays access-metro networks will be able to support future 5.5 and 6G cell densification operating at mmWave and THz frequency, using spectral efficient analogue radio over fibre transmission, there will be trade-offs to be considered. In our experiment setup, we show that the limit for ARoF accessible performance is reached after transmission over 3 ROADMs and a total of 49 km of fibre.

翻译：本文分析并验证了数字相干信号与模拟光载射频信号在接入-城域传输网络及实际光纤中的共存性能。我们研究了两种信号频谱邻近性及典型电信级ROADM非理想滤波对准对信号质量的影响。实验结果表明，尽管随着网络拓扑中ROADM数量的增加，性能会出现劣化，但两种信号的共存确实可行。因此，虽然当前接入-城域网络能够支持未来5.5G和6G在毫米波与太赫兹频段的小区密集化部署，并采用频谱高效的模拟光载射频传输技术，但仍需权衡相关折衷方案。在实验配置中，我们发现经过3个ROADM和总计49公里光纤传输后，ARoF的可达性能达到极限。