Real-time MIMO DSP is challenging but essential for practical deployment of coupled-core multicore fiber transmission systems as well as mode-division multiplexed transmission systems.
We implemented a real-time MIMO DSP which can equalize four spatially-coupled signals (or four spatial modes) with dual polarizations by utilizing FPGA boards.
With the real-time MIMO DSP, we show an experimental demonstration of real-time transoceanic transmission over coupled-core multicore fibers.
The WDM DP-QPSK signals were transmitted over 7,200-km coupled-core four-core fibers and demodulated by real-time MIMO DSP.
We also show the first real-time QAM transmission over coupled-core four-core fibers.
All-optical performance monitoring based on optical sampling was proposed for multi-bitrate and multi-format signals in
transparent optical networks. The performance of 42.7-Gb/s RZ-DQPSK and 10.7-Gb/s RZ-DPSK signals were
successfully monitored and correlated with the actually measured BER.
Orthogonal polarization multiplexing technologies has been applied to dense wavelength division multiplexing (DWDM) transmission systems to reduce the crosstalk between the adjacent channels. It is one of the important factors in the viewpoint of not only the transmission performance but also the designing terminal equipment to clarify the relation of the polarization state between adjacent channels. In this paper, polarization state dependency was investigated experimentally in the DWDM transmission performance by using 11.4Gbit/s with 0.3nm channel spacing. Furthermore, as the long-term transmission performance is an important factor in the point of the stability, the long-term performance has been measured in the orthogonal polarization state. We have confirmed that the orthogonal polarization multiplexing is useful for the transmission performance and have shown its stability by the long-term measurement through the experiments.
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