Improving channel capacity by nonlinearity compensation and noise suppression in high-speed multi-span optical transmission systems |
| |
Authors: | Xiaodong He Xiaoping ZhangQunfeng Shao Lian XiangMinan Gong Kan Zhang |
| |
Institution: | Institute of Modern Communication Technology, School of Information Science and Engineering, Lanzhou University, No. 222 Tianshui South Road, Lanzhou 730000, China |
| |
Abstract: | In this paper, the channel capacity of 40 Gb/s multi-span nonlinear optical transmission systems with nonlinearity compensation and self-adapting Wiener filtering is studied by use of Finite State Machine (FSM) approach. The comparison of channel capacity of the system with differential phase shift keying (DPSK) and on–off keying (OOK) modulation is also investigated. The channel capacity increases monotonically with the input power for transmission systems with simultaneous compensation of dispersion and nonlinearity, which performs as well as linear system. DPSK shows a much better performance and the channel capacity has an improvement of at least 48 percent over that OOK modulation. A further reduction of the amplified spontaneous emission (ASE) noise accumulation is obtained by Wiener filtering, which improves the channel capacity considerably when the input peak power is less than 3 mW. |
| |
Keywords: | Channel capacity Dispersion and nonlinearity compensation Optical communications Wiener filtering |
本文献已被 ScienceDirect 等数据库收录! |