Patent ID: 8977130
Filing Date: 2015-03-10
Classification: H04J

Abstract:
1. An optical transmission device comprising: a wavelength selective switch configured to select a first optical signal having a first wavelength from an input wavelength division multiplexing (WDM) signal on a predetermined wavelength grid of the input WDM signal; an optical filter circuit configured to include: a splitter configured to split the input WDM signal, a split signal split by the splitter being transferred to the optical filter circuit; and a coupler configured to couple the first optical signal selected by the wavelength selective switch and the second optical signal passed through the optical filter circuit, wherein the controller is configured to control the optical filter circuit so that while the pass wavelength of a first optical tunable filter included in the plurality of optical tunable filters is tuned in a period of time for tuning adjustment, transferring of an optical output of the first optical tunable filter is prevented, or power of an optical output of the first optical tunable filter is reduced.