光波長多重通信
ここで、 v = 300 ⋅ 10 6 {\displaystyle v=300\cdot 10^{6}} [m/s]、 f = 193.10 ⋅ 10 12 {\displaystyle f=193.10\cdot 10^{12}} [Hz]、 δ f = 100 ⋅ 10 9 {\displaystyle \delta f=100\cdot 10^{9}} [Hz]とすると、 δ λ = − v f 2 δ f = − 300 ⋅ 10 6 ( 193.10 ⋅ 10 12 ) 2 ⋅ 100 ⋅ 10 9 = 0.805 ⋅ 10 − 9 [ m ] = 0.805 [ n m ] {\displaystyle \delta \lambda =-{v \over f^{2}}\delta f=-{300\cdot 10^{6} \over (193.10\cdot 10^{12})^{2}}\cdot 100\cdot 10^{9}=0.805\cdot 10^{-9}\ [m]=0.805\ [nm]}
波長選択 OXC(Optical cross Connect) 経路切替 OADM(Optical Add Drop Multiplexer) 分離・結合。光分岐挿入装置のこと。