OPTICAL TRANSMISSION DEVICE

摘要

Dispersion is efficiently compensated during OADM control of optical signals with different bit rates. Where add optical signals have k different bit rates, an add controller (12) is connected to k (< N) of N input ports and sends the add optical signals to the k input ports to perform add control. A drop controller (13) is connected to m (< M) of M output ports and performs drop control on optical signals from the m output ports. The k input ports of an N × M wavelength selective switch (11) and the add controller (12) are connected by k links (L1 to Lk) which have introduced therein dispersion compensators for compensating chromatic dispersions of the add optical signals with the respective bit rates. The add controller (12) selects a link through which an add optical signal is to be passed for dispersion compensation, and sends the signal to the N × M wavelength selective switch (11) via the selected link.