Geng Jia-Qi, Fan-Yuan Guan-Jie, Li Kang-Jie, Tang Ming, Wang Shuang, He De-Yong, Chen Wei, Yin Zhen-Qiang, Guo Guang-Can, Han Zheng-Fu
Opt Lett. 2022 Jun 15;47(12):3111-3114. doi: 10.1364/OL.463545.
The quantum-classical coexistence can be implemented based on wavelength division multiplexing (WDM), but due to Raman noise, the wavelength spacing between quantum and classical signals and launch power from classical channels are restricted. Space division multiplexing (SDM) can now be availably achieved by multicore fiber (MCF) to reduce Raman noise, thereby loosening the restriction for coexistence in the same band and obtaining a high communication capacity. In this paper, we realize the quantum-classical coexistence over a 7-core MCF. Based on the SDM, the highest launch power of 25 dBm is achieved which has been extended nearly 19 times in previous work. Moreover, both the quantum and classical channels are allocated in the C-band and the minimum wavelength spacing between them is only 1.6 nm. The coexistence system eliminates the need for adding a narrowband filter.
量子-经典共存可以基于波分复用（WDM）来实现，但由于拉曼噪声，量子信号与经典信号之间的波长间隔以及来自经典信道的发射功率受到限制。现在，通过多芯光纤（MCF）可以有效地实现空分复用（SDM），以降低拉曼噪声，从而放宽同一频段中共存的限制并获得高通信容量。在本文中，我们在一根7芯MCF上实现了量子-经典共存。基于SDM，实现了25 dBm的最高发射功率，这比之前的工作提高了近19倍。此外，量子信道和经典信道都分配在C波段，它们之间的最小波长间隔仅为1.6 nm。该共存系统无需添加窄带滤波器。
