采用差分编码的12 × 160 Gbps (1.92 Tbps) WDM光系统的性能增强,传输距离可达8000公里

Rohit B. Patel, D. Kothari
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引用次数: 1

摘要

近年来,对大容量光传输平台的需求迅速增长。这引起了研究人员的注意。Tbps数量级的光网络正在不断发展。单个光通道的容量正朝着100gbps甚至更高的方向发展。本文演示了1.92 Tbps波分复用光系统的设计和性能。使用三个连续波激光器产生光载流子。使用两个双音发生器产生12个子载波,每个子载波间隔80 GHz。每个子载波以160 Gbps的传输速率承载信息,将频谱效率提高到2 b/s/Hz。对12 × 160gb /s (1.92 Tb/s) PDM-QPSK WDM光系统进行了分析,考虑了100 km传输距离下的无编码、灰度编码和差分编码三种不同情况。进行了大量的仿真,以评估每种情况下的符号错误率、误差矢量大小和q因子。通过比较可以看出,采用差分编码的系统比其他两种情况具有更好的性能。与其他两种情况相比,差分编码在2至5 dB范围内实现了q因子的改进。采用差分编码的PDM-QPSK WDM光系统,在保持Q因子高于FEC极限要求(BER值3.8 × 10-3)的情况下,传输距离可延长至8000 km。
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Performance enhancement of 12 × 160 Gbps (1.92 Tbps) WDM optical system for transmission distance upto 8000 km with differential coding
In the past few years the demand for high capacity optical transport platform is rapidly increasing. It has drawn the attention of the researchers. The optical networks with the capacity of the order of Tbps are evolving. The capacity of individual optical channel is increasing towards 100 Gbps and beyond. In this paper, we demonstrate design and performance of 1.92 Tbps WDM Optical System. Three CW lasers are used to generate optical carriers. Twelve sub carriers, each spaced 80 GHz apart are produced using two dual tone generators. Each subcarrier carries information at transmission rate of 160 Gbps to enhance the spectral efficiency to 2 b/s/Hz. The analysis is carried out for 12 × 160 Gb/s (1.92 Tb/s) PDM-QPSK WDM optical system considering three different cases that is without coding, with gray coding and with differential coding for 100 km transmission distance. Extensive simulations are carried out to evaluate symbol error rate, error vector magnitude and Q-factor in each case. From the comparison, it is observed that the system with differential coding gives better performance in comparison with other two cases. An improvement in Q-factor with differential coding is achieved in the range of 2 to 5 dB with respect to other two cases. It is also shown that the transmission distance for PDM-QPSK WDM optical system with differential coding can be extended upto 8000 km keeping the Q factor above the FEC limit requirement (BER value 3.8 × 10-3).
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