固定ITU-T网格中时频压缩DP-QPSK超信道的亚奈奎斯特现场试验
Sub-Nyquist Field Trial Using Time Frequency Packed DP-QPSK Super-Channel Within Fixed ITU-T Grid
摘要：
首次在长距离超级信道现场试验传输中演示了亚奈奎斯特时频打包技术。该技术允许有限的频谱占用，即使是低阶调制格式。该传输成功地在悉尼和墨尔本之间的澳大利亚链路上进行，其中包括995公里的未补偿SMF与共存的流量。40和100 Gb/s的同向传播信道与超级信道一起在50 GHz ITU-T网格中传输，而没有额外的损失。超级信道由具有低级调制格式（即DP-QPSK）的八个子信道组成，保证了更好的OSNR鲁棒性和相对于更高阶格式的降低的复杂度。在接收端，相干检测与迭代最大后验概率（MAP）检测和解码一起使用。在悉尼和墨尔本之间成功地传输了一条975 Gb/s的DP-QPSK超级信道，使用了4个50 GHz的WSS信道（200 GHz）。在OSNR=15.8 dB的情况下实现了5.58 bit/s/Hz的最大潜在SE，与安装的100 Gb/s信道的OSNR相当。系统的可靠性通过长期的测量得到了证明。此外，通过在环回配置中闭合链路，实现了9254 bit/s/Hz*km的潜在SE*d乘积。
英文摘要：
Sub-Nyquist time frequency packing technique was demonstrated for the first time in a super channel field trial transmission over long-haul distances. The technique allows a limited spectral occupancy even with low order modulation formats. The transmission was successfully performed on a deployed Australian link between Sydney and Melbourne which included 995 km of uncompensated SMF with coexistent traffic. 40 and 100 Gb/s co-propagating channels were transmitted together with the super-channel in a 50 GHz ITU-T grid without additional penalty. The super-channel consisted of eight sub-channels with low-level modulation format, i.e. DP-QPSK, guaranteeing better OSNR robustness and reduced complexity with respect to higher order formats. At the receiver side, coherent detection was used together with iterative maximum-a-posteriori (MAP) detection and decoding. A 975 Gb/s DP-QPSK super-channel was successfully transmitted between Sydney and Melbourne within four 50GHz WSS channels (200 GHz). A maximum potential SE of 5.58 bit/s/Hz was achieved with an OSNR=15.8 dB, comparable to the OSNR of the installed 100 Gb/s channels. The system reliability was proven through long term measurements. In addition, by closing the link in a loop back configuration, a potential SE*d product of 9254 bit/s/Hz*km was achieved.
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