Longspantransmission line system is the lifeline project as the electric powe's carrier.
大跨越输电塔线体系作为高压电能输送的载体，是重要的生命线工程。
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It then analyzes OSNR limitation problem of ultra-longspantransmission system and proposes some solutions, including Raman Fiber Amplifier(RFA) and Remote Optically Pumped Amplifier(ROPA).
Longspantransmission tower-line system is a vital lifeline to power system. Exposing in environment, the system must be robust enough to bear destructive force in extreme environmental conditions.