Re-modulation device, demodulation reception device, modulation transmission device, modulation communication system, re-modulation method, and recording medium

A demodulation reception device comprising:

• a acquisition circuit configured to acquire data from a second modulation optical signal derived by subjecting an optical signal to a second amplitude modulation by the data, and to acquire from the second modulation optical signal additional data added to the data that represents an amplitude-modulation count of the optical signal;
• and
• a discard processing circuit to discard the data when determining that the data matches previously acquired data and that the amplitude-modulation count represented by the additional data added to the data is smaller than an amplitude-modulation count represented by additional data added to the previously acquired data, wherein
• when a first modulation optical signal is determined to be passed, where the first modulation signal is derived by subjecting the optical signal to a first amplitude modulation by the second data being sent to the demodulation reception device by a modulation transmission device,
• the second modulation optical signal is derived by subjecting the optical signal to a second amplitude modulation by the second data and by the additional data.