Capacity upgrade of already installed undersea cable system is attractive from the cost point of view. Advanced technologies such as powerful forward error correction support this upgrade. In this paper, we demonstrate a system capacity upgrade beyond the designed limitation experimentally using the advanced technologies. As a result, a possibility to triple the designed capacity of trans-Atlantic system is shown. In addition, we propose a configuration to improve the transmission efficiency of the network combined with the expansion of the already installed undersea cable system.
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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