Luís Ruben S, Rademacher Georg, Puttnam Benjamin J, Awaji Yoshinari, Wada Naoya
Opt Express. 2018 Sep 3;26(18):24044-24053. doi: 10.1364/OE.26.024044.
We propose and evaluate the use of spatial-division multiplexing (SDM) multiple input multiple output (MIMO) systems to support long distance transmission using single-mode homogeneous multicore fibers. We show that on a uniform link with per-span inter-core skew compensation, the required SDM-MIMO memory length corresponds to the largest inter-core skew per span on the link. Furthermore, we show that with inter-core skew compensation, the required memory length of the SDM-MIMO is nearly constant with the transmission distance for accumulated crosstalk below -11 dB. We experimentally demonstrate the use of SDM-MIMO with a memory length of 20 ns on a long distance transmission link using 20 GBaud PDM-QPSK signals. We achieve a reach of 9780 km, which corresponds to a 9% improvement over the case without SDM-MIMO. We also show that the use of SDM-MIMO is applicable to the transmission of signals with higher modulation order, achieving transmission reach improvements of 14% for 20 GBaud PDM-16QAM and PDM-64QAM signals.
我们提出并评估使用空分复用（SDM）多输入多输出（MIMO）系统，以利用单模均匀多芯光纤来支持长距离传输。我们表明，在具有每跨段芯间偏斜补偿的均匀链路中，所需的SDM-MIMO存储长度对应于链路上每跨段最大的芯间偏斜。此外，我们表明，通过芯间偏斜补偿，对于累积串扰低于-11 dB的情况，SDM-MIMO所需的存储长度随传输距离几乎保持恒定。我们通过实验证明了在使用20 GBaud偏振复用正交相移键控（PDM-QPSK）信号的长距离传输链路上，使用存储长度为20 ns的SDM-MIMO。我们实现了9780 km的传输距离，相较于不使用SDM-MIMO的情况提高了9%。我们还表明，SDM-MIMO的使用适用于更高调制阶数信号的传输，对于20 GBaud偏振复用16正交幅度调制（PDM-16QAM）和偏振复用64正交幅度调制（PDM-64QAM）信号，传输距离提高了14%。
