Long-haul 112Gbit/s coherent polarization multiplexing QPSK transmission experiment on G.652 fiber with the improved DSP unit
Long-haul 112Gbit/s coherent polarization multiplexing QPSK transmission experiment on G.652 fiber with the improved DSP unit
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DOI：
10.1016/j.ijleo.2012.11.020
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发表时间：
2013-09
期刊：
影响因子：
3.1
通讯作者：
Xiaobo Meng;Weiqin Zhou;C. Ge;Xian Zhou;Xue Chen
中科院分区：
文献类型：
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作者：
Xiaobo Meng;Weiqin Zhou;C. Ge;Xian Zhou;Xue Chen
提出了一种改进的DSP单元，它具有联合定时恢复和均衡方案，以消除定时恢复和自适应均衡的不利影响。联合方案包括两个新的算法，我们提出了。一种是对模拟器件的非理想特性不敏感的全数字定时恢复环路。另一种是BER辅助恒模算法（BA-CMA），它可以解决极化分量的收敛不良问题。仿真结果表明，联合方案比独立方案更有效。采用改进的DSP单元在G.652 SSMF上进行了112 Gbit/s长距离相干PM-QPSK传输实验。实验结果表明，所采用的DSP单元是有效的。实验结果表明，光域CD补偿方法与电域CD补偿方法相比，电均衡是一种较好的补偿方法。此外，仿真结果还表明，归零码系统比非归零码系统具有更好的非线性抑制能力，而DQPSK格式比QPSK格式具有更差的误码率性能。
An improved DSP unit with a joint timing recovery and equalization scheme is proposed to remove the adverse interaction of timing recovery and adaptive equalization. The joint scheme consists of two novel algorithms we proposed. One is the all-digital timing recovery loop which is not sensitive to the nonideal characteristics of the analog device. The other is BER aided CMA (BA-CMA) which can solve the problem of ill-convergence of the polarization component. The simulating result shows that the joint scheme is more effective than the independent scheme. A long-haul 112 Gbit/s coherent PM-QPSK transmission experiment on G.652 SSMF employing the improved DSP unit is reported. The experimental results illuminate that the DSP unit we employed is effective. The results of the experiment showed that the method of CD compensation at optical domain was contrasted with the method at electrical domain, electrical equalization was illuminated a better method. In addition, the results also illuminate that RZ system can mitigate nonlinearity better than NRZ system, and DQPSK format has worse BER performance than QPSK format.