强度调制直接检测非正交光时域重叠复用系统

时域重叠复用是提升通信系统频谱效率和性能的有效方式,设计了基于强度调制直接检测的非正交光时域重叠复用系统,并进行实验验证。论文比较了非正交光时域重叠复用系统与同速率脉冲振幅调制系统的性能。实验结果表明,在矩形成型条件下经2重,3重,4重非正交光时域重叠复用系统调制的信号与相同比特速率的4电平,8电平,16电平脉冲振幅调制系统的信号相比,达到硬判决前向纠错门限所需的最小接收光功率分别降低了2.5dB,4.5dB和8.5dB。

Non-Orthogonal Optical Overlapped Time Multiplexing System for Intensity Modulation Direct Detection

Overlapped time domain multiplexing is one of the most efficient manners to improve the communication system spectral efficiency and performance. A non-orthogonal optical overlapped time domain multiplexing system based on intensity modulation and direct detection is designed, and is demonstrated experimentally. The performance of non-orthogonal optical overlapped time division multiplexing system is compared with pulse amplitude modulation system that has the same bitrate with the proposed system. Experimental results show that when compared to the signals modulated by 4, 8 and 16 pulse amplitude modulation, the minimum receiver optical power of the signals modulated by the proposed system with rectangular pulse shaping of two, three and four fold overlapping are reduced by 2.5, 4.5 and 8.5dB, respectively, when satistying the hard detection-forward error correction threshold limit.