ESRB writes: Japan's NTT claims to have developed a backhaul link capable of achieving 1Pbps over a distance of 50km using a single fibre. NTT's report states that it used a specially-designed optical fibre in which one fibre strand contained 12 "cores" — light paths within the fibre that don't interact with each other. Each of those fibres carried an 84.5 Terabit-per-second signal to achieve the total 1 Pbps throughput.
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