Performance Comparison of All-Optical Amplify-and-Forward Relaying FSO Communication Systems With OOK and DPSK Modulations

IEEE Photonics Journal

Xin Xu¹  Xiaoping Xie²  Jiazheng Song²  Yulong Su²  Tao Duan²  Hui Hu²  Xinning Huang³ 

[1] Hefei University of Technology, Anhui, China;State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Shaanxi, China;University of Chinese Academy of Sciences, Beijing, China;

关键词: Free-space optical communication;    all-optical relaying;    receiving sensitivity loss;    OOK;    DPSK;   

DOI  :  10.1109/JPHOT.2018.2852301

来源: DOAJ

【 摘 要 】

All-optical amplify-and-forward (OAF) relaying technique can amplify and filter the attenuated optical signal in optical domain, and thus is regarded as a simple way to extend the transmission distance of free-space optical (FSO) communication systems. At the relaying node, however, the incident background radiation and the amplified spontaneous emission noise of the deployed erbium-doped fiber amplifier will deteriorate the optical signal-to-noise, therefore causing the degradation of the system's bit error ratio (BER). In this paper, we perform simulations and experiments on FSO system with on-off keying (OOK) and differential phase-shift keying (DPSK) signals, focusing on the receiving sensitivity loss (RSL) of the OAF-assisted dual-hop system. Taking the BER level of 10^-7 as the reference, we find that the DPSK system suffers more than 8 dB RSL at the data rate of 5 Gb/s in simulation, while the OOK system gets less than 1 dB RSL at the same data rate. In the following experiments, the obtained results exhibit that RSL of DPSK system is nearly 10 dB, which of OOK system is less than 1.5 dB, shown similarly property to the simulations.

【 授权许可】

Unknown