Optical signal generation device and method and chip

An integrated circuit (IC) chip, comprising:

• an optical signal generation device, comprising:
• a laser configured to output a first optical signal and output a second optical signal;
• a first modulator connected to the laser and configured to receive the first optical signal and a loaded first electrical modulation signal, and modulate the first optical signal based on the first electrical modulation signal to obtain a first modulated optical signal;
• a second modulator connected to the laser and configured to receive the second optical signal and a loaded second electrical modulation signal, and modulate the second optical signal based on the second electrical modulation signal to obtain a second modulated optical signal;
• a first adjustment module connected to the first modulator and configured to adjust a phase of the first modulated optical signal or an optical path along which the first modulated optical signal travels;
• and
• a beam combiner connected to the adjustment module and the second modulator, and configured to combine the second modulated optical signal and the first modulated optical signal that is obtained after the phase adjustment or the optical path adjustment into a combined signal, and output the combined signal, wherein the first electrical modulation signal is an N-level pulse-amplitude modulation (PAM-N) signal, the second electrical modulation signal is an M-level pulse amplitude modulation (PAM-M) signal, and wherein:
• the combined signal is a PAM-M*N signal;
• and an optical path difference between the first modulated optical signal and the second modulated optical signal is a preset value after the optical path adjustment;
• or
• a phase difference between the first modulated optical signal and the second modulated optical signal is
• π
• 2
• +
• N
• *
• 2
• ⁢
• π
• after the phase adjustment, and the combined signal is an M*N-level quadrature amplitude modulation (M*N-QAM) signal.

An optical signal generation method, comprising:

• outputting, by a laser, a first optical signal to a first modulator and a second optical signal to a second modulator;
• receiving, by the first modulator, the first optical signal and a loaded first electrical modulation signal, and modulating the first optical signal based on the first electrical modulation signal to obtain a first modulated optical signal;
• receiving, by the second modulator, the second optical signal and a loaded second electrical modulation signal, and modulating the second optical signal based on the second electrical modulation signal to obtain a second modulated optical signal;
• adjusting, by a first adjustment module, a phase of the first modulated optical signal or an optical path along which the first modulated optical signal travels;
• and
• combining, by the beam combiner, the second modulated optical signal and the first modulated optical signal that is obtained after the phase adjustment or the optical path adjustment, into a combined signal, and outputting the combined signal, wherein the first electrical modulation signal is an N-level pulse-amplitude modulation (PAM-N) signal, the second electrical modulation signal is an M-level pulse-amplitude modulation (PAM-M) signal, and wherein:
• the combined signal is a PAM-M*N signal;
• and an optical path difference between the first modulated optical signal and the second modulated optical signal is a preset value after the optical path adjustment;
• or
• a phase difference between the first modulated optical signal and the second modulated optical signal is
• π
• 2
• +
• N
• *
• 2
• ⁢
• π
• after the phase adjustment, and the combined signal is an M*N-level quadrature amplitude modulation (M*N-QAM) signal.