Control device, control method, and fiber laser device

A control device for controlling two or more laser diode (LD) modules each supplying pumping light to a variable-output fiber laser, the control device comprising:

• a controller that sets, in accordance with a set value of laser output power of the variable-output fiber laser, a number of LD modules to which a driving current is supplied among the two or more LD modules;
• and
• a digital potentiometer comprising two or more variable resistors each configured to convert an analog output setting signal to a current setting signal, wherein
• the analog output setting signal indicates the set value,
• the current setting signal is an analog signal indicating a value of the driving current to be supplied to each of the LD modules to which the driving current is supplied, and
• the digital potentiometer is configured to set a resistance value of each of the variable resistors in accordance with a resistance setting signal that is a digital signal outputted from the controller.