Few-Mode Fiber with Low Spontaneous Raman Scattering for Quantum Key Distribution and Classical Optical Communication Coexistence Systems
Qi Zhao,
Jianjun Tang,
Weiwen Kong,
Zhenyu Zhao,
Jingjing Zheng,
Yang Liu
Affiliations
Qi Zhao
Institute of Basic Operations Technology, China Telecom Research Institute, Beijing 102209, China
Jianjun Tang
Institute of Basic Operations Technology, China Telecom Research Institute, Beijing 102209, China
Weiwen Kong
Institute of Basic Operations Technology, China Telecom Research Institute, Beijing 102209, China
Zhenyu Zhao
China Academy of Information and Communications Technology, Beijing 102209, China
Jingjing Zheng
Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
Yang Liu
Institute of Basic Operations Technology, China Telecom Research Institute, Beijing 102209, China
In this paper, the theoretical model of spontaneous Raman scattering (SpRS) in few-mode fiber (FMF) is discussed. The influence of SpRS on quantum key distribution (QKD) in FMF is evaluated by combining wavelength division multiplexing (WDM) and space division multiplexing (SDM) techniques. On this basis, an improved ring-assisted FMF is designed and characterized; the transmission distance can be increased by up to 54.5% when choosing different multi-channels. The effects of forward and backward SpRS on QKD are also discussed.
