Dummy-light generating device, optical transmission apparatus, and dummy-light generating method

A dummy-light generating device comprising:

• a light emitter to output continuous light;
• a modulated-light generator to generate, using the continuous light, first intensity-modulated light subjected to intensity modulation and second intensity-modulated light delayed by a half time of a modulation cycle of the first intensity-modulated light with respect to the first intensity-modulated light and having a polarization state different from a polarization state of the first intensity-modulated light, the modulated-light generator delaying the second intensity-modulated light being delayed by the half time of the modulation cycle of the first intensity-modulated light based on a difference in drive voltage signals for modulation of the first intensity-modulated light and the second intensity-modulated light;
• and
• a polarization combiner to perform polarization combination of the first intensity-modulated light and second intensity-modulated light and output light after the polarization combination as continuous dummy light.