Optical branching and insertion device, network management device, and wavelength selective switch

A network management device, comprising:

• a first memory;
• a first processor coupled to the first memory and configured to manage an optical branching and insertion device, the optical branching and insertion device comprising:
• a wavelength selective switch including a plurality of ports that causes an optical signal of a wavelength among optical signals received at an input port among the plurality of ports to pass to an output port among the plurality of ports;
• a second memory configured to store setting information including a usage of a channel corresponding to;
• and
• a second processor coupled to the second memory and configured to cause the wavelength selective switch to execute a process to expand a band through which an optical signal of a predetermined wavelength is allowed to pass, the setting information indicates that a channel corresponding to the predetermined wavelength is to be used to guide an optical signal from the input port to the output port and a channel corresponding to a wavelength adjacent to the predetermined wavelength is not to be used.

A wavelength selective switch coupled to a memory configured to store setting information including a usage of a channel corresponding each of a plurality of wavelengths, the wavelength selective switch comprising:

• an input port;
• an output port;
• and
• a processor that executes a process to expand a band through which an optical signal of a predetermined wavelength is allowed to pass, when the setting information indicates that a channel corresponding to the predetermined wavelength is to be used to guide an optical signal from the input port to the output port and a channel corresponding to a wavelength adjacent to the predetermined wavelength is not to be used.