Embodiments of the present application provide an optical signal generation device. The device includes a laser, a first modulator, a second modulator, a first adjustment module, and a beam combiner. The laser is configured to: output a first optical signal to the first modulator, and output a second optical signal to the second modulator. The two modulators are separately configured to: receive an optical signal and a loaded electrical modulation signal, and modulate the optical signal based on the electrical modulation signal, to obtain a first modulated optical signal and a second modulated optical signal. The first adjustment module is further configured to adjust a phase of the modulated optical signal or an optical path to the beam combiner. The beam combiner is configured to: combine the first modulated optical signal obtained after the adjustment and the second modulated optical signal, and output a combined signal.