Recently, the Japanese Electric Company has demonstrated a single fiber on the transmission capacity to achieve 50.9Tbps, transmission distance greater than 11,000 km.
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According to the introduction, this is the use of C + L band erbium-doped fiber amplifier (EDFA) for the first time to achieve more than 10,000 km of 50Tb transmission.
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Nippon Electric explained that achieving such a high capacity requires efficient use of bandwidth at levels close to the Shannon limit (optical spectrum of the basic spectral efficiency limit).
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Researchers have developed a multi-level linear and nonlinear constellation optimization algorithm that utilizes this algorithm, Japan Electric, to obtain an optimized 32-channel amplitude modulation (opt32) constellation that achieves near Shannon ultimate capacity and has a higher non-linearity Capacity limits, which are more relevant to submarine transmission.
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Opt32 modulation allows Japanese electrical researchers to achieve unprecedented spectral efficiency of 6.14b / s / Hz over spanning Pacific distances.
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In addition, the C + L amplifier is used to maximize the capacity of each fiber pair. In order to provide record transmission capability, Nippon Electric has developed a patented bi-directional amplifier design that reduces the effective noise figure and device complexity.
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