Research on co-propagation of QKD and classical communication by reducing the classical optical power

• 来源期刊: 中国物理B（英文版）
• 关键词: QKD co-propagation spontaneous Raman scattering gated APD modulation formats
• 年，卷（期）: 2019,（4）
• 页码范围: 70-75
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/4/040303

摘要

We investigate the crosstalk noise,especially the spontaneous Raman scattering,in the optical fiber of a co-propagation system between quantum key distribution (QKD) and classical communications.Although many methods have been proposed,such as increasing the wavelength spacing and narrowband filtering technique,to suppress Raman scattering noise,these methods greatly affect the performance of QKD.One way to solve the obstacle restricting the co-existence is to decrease the classical signal power.Based on the high gain of the gated avalanche photodiode and pulse position modulation,we demonstrate that the co-propagation system works effectively with only a small effect on long-haul fibers,which has great significance for the practical widespread commercialization of QKD.