| 摘要 |
PROBLEM TO BE SOLVED: To suppress degradation of transmission characteristics caused by a high-frequency loss in an internal high-frequency line in a digital coherent optical receiver.SOLUTION: A frequency peaking controller 16 respectively outputs a peaking control signal representing frequency peaking characteristics for each electric signal output from a digital coherent optical receiver. Frequency peaking adjustment parts 15A, 15B, 15C respectively adjust frequency characteristics of each electric signal on the basis of the peaking control signals. |
