Multi-dimensional permutation-modulation format for coherent optical communications
Multi-dimensional permutation-modulation format for coherent optical communications
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DOI：
10.1364/oe.23.015587
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发表时间：
2015-06-15
期刊：
影响因子：
3.8
通讯作者：
Kikuchi, Kazuro
中科院分区：
文献类型：
--
作者：
Ishimura, Shota;Kikuchi, Kazuro
我们在相干光通信系统中引入了多维排列调制格式，并对其性能进行了分析，重点关注功率效率和频谱效率。在四维（4D）调制的情况下，偏振切换正交相移键控（PS - QPSK）调制格式和偏振正交幅度调制（POL - QAM）格式可归类为排列调制格式。除了这些众所周知的调制格式外，我们还发现了在功率效率和频谱效率之间进行权衡的新型调制格式。随着维度的增加，频谱效率可以更接近香农理论所预测的信道容量。我们通过对符号错误率（SER）和误比特率（BER）性能的计算机模拟验证了这些理论特性。例如，新发现的八维（8D）排列调制格式可将频谱效率提高到2.75比特/秒/赫兹/偏振态/信道，而在误比特率为\(10^{-3}\)时，相对于QPSK的功率代价约为1 dB。（C）2015美国光学学会
We introduce the multi-dimensional permutation-modulation format in coherent optical communication systems and analyze its performance, focusing on the power efficiency and the spectral efficiency. In the case of four-dimensional (4D) modulation, the polarization-switched quadrature phase-shift keying (PS-QPSK) modulation format and the polarization quadrature-amplitude modulation (POL-QAM) format can be classified into the permutation modulation format. Other than these well-known modulation formats, we find novel modulation formats trading-off between the power efficiency and the spectral efficiency. With the increase in the dimension, the spectral efficiency can more closely approach the channel capacity predicted from the Shannon's theory. We verify these theoretical characteristics through computer simulations of the symbol-error rate (SER) and bit-error rate (BER) performances. For example, the newly-found eight-dimensional (8D) permutation-modulation format can improve the spectral efficiency up to 2.75 bit/s/Hz/pol/channel, while the power penalty against QPSK is about 1 dB at BER=10(-3). (C) 2015 Optical Society of America