Laser, laser modulation method and laser combination system

A laser modulation method, comprising:

• generating a laser gain signal;
• performing mode selection on the laser gain signal according to a first filtering response curve;
• performing resonance on the laser gain signal obtained after the mode selection, so as to generate a laser after a laser generation condition is met;
• loading a modulation signal to the laser, to modulate the laser and generate a modulated laser;
• and
• filtering the modulated laser according to a second filtering response curve, to generate an output laser, wherein the output laser matches the second filtering response curve.

A system, comprising:

• a plurality of devices, wherein output ports of the plurality of devices are connected to an input port of a common waveguide;
• wherein each of the plurality of devices comprises:
• a gain medium, a resonant cavity, and a second microring resonator, wherein:
• the resonant cavity comprises a first cavity mirror and a second cavity mirror, the first cavity mirror is located at one port of the gain medium, and the second cavity mirror is located at another port of the gain medium;
• the second cavity mirror comprises one splitter, one first microring resonator, and one reflecting grating;
• an input port of the splitter is connected to the another port of the gain medium;
• a first output port of the splitter is connected to an input port of the first microring resonator, a second output port of the splitter is connected to the second microring resonator, and a download port of the first microring resonator is connected to the reflecting grating;
• the gain medium is configured to generate a laser gain signal;
• the resonant cavity that is formed by the first cavity mirror and the second cavity mirror performs resonance on the laser gain signal, and a laser is generated after a laser generation condition is met, wherein the first microring resonator is configured to perform mode selection on the laser gain signal according to a filtering response curve of the first microring resonator, and the reflecting grating is configured to reflect the laser gain signal obtained after the mode selection;
• the gain medium is further configured to load a modulation signal to the laser that is generated in the resonant cavity, to modulate the laser that is generated in the resonant cavity and generate a modulated laser;
• the splitter is configured to output the generated modulated laser to the second microring resonator through the second output port after the modulated laser is generated in the resonant cavity;
• and
• an input port of the second microring resonator is connected to the second output port of the splitter, the second microring resonator is configured to filter the modulated laser according to a filtering response curve of the second microring resonator to generate an output laser, and output the output laser through a download port of the second microring resonator, wherein the output laser matches the filtering response curve of the second microring resonator.