Laser chip, injection-locked laser, and network device

An injection-locked laser, comprising a master laser, an isolator, and a laser chip, wherein

• the master laser is configured to generate injection light that enters a first port of an optical splitter after passing through the isolator;
• and
• the laser chip comprises:
• a first power detector, a first controller, the optical splitter, a polarization splitter-rotator, a bandpass filter, and a slave laser, wherein
• the optical splitter, the polarization splitter-rotator, the bandpass filter, and the slave laser are sequentially connected;
• the optical splitter comprises the first port, a second port, and a third port, wherein the first port is configured to receive injection light of the master laser, the second port is connected to the first power detector, and the third port is connected to the polarization splitter-rotator;
• the optical splitter is configured such that the injection light enters the optical splitter through the first port, and is output to the polarization splitter-rotator through the third port;
• the polarization splitter-rotator is configured to perform optical splitting and polarization conversion on the injection light comprising:
• the polarization splitter-rotator is configured to split the injection light thereby separating TE mode injection light and TM mode injection light of the injection light, and the polarization splitter-rotator is configured to transmit the TE mode injection light to a first waveguide and the TM mode injection light to a second waveguide;
• the polarization splitter-rotator comprises the first waveguide and the second waveguide, wherein the first waveguide is configured to transmit the TE mode injection light, the second waveguide is configured to receive the TM mode injection light and to transmit the TE mode injection light,
• the first waveguide and the second waveguide are configured to output the TE mode injection light to the bandpass filter, and
• the bandpass filter is configured to inject the TE mode injection light into the slave laser;
• the slave laser is configured to generate a light beam, the third port of the optical splitter is configured to receive the light beam from the slave laser, the first port is configured to output a first part of the light beam to the first power detector, and the second port is configured to output a second part of the light beam to the first power detector;
• the first power detector is configured to detect an optical power of the second part of the light beam, and generate a first detection signal;
• and
• the first controller is configured to perform at least one of current adjustment or temperature adjustment on the slave laser based on the first detection signal, and to change a transmit wavelength of the slave laser, thereby enabling the optical power detected by the first power detector to reach a first preset value.

A network device, comprising a frequency division multiple access device and an injection-locked laser, wherein the frequency division multiple access device is configured to modulate a signal to the injection-locked laser, and the injection-locked laser is configured to transmit the signal as an optical signal;

• the injection-locked laser comprises:
• a master laser, an isolator, and a laser chip, wherein
• the master laser is configured to generate injection light that enters a first port of an optical splitter after passing through the isolator;
• and
• the laser chip comprises:
• a first power detector, a first controller, the optical splitter, a polarization splitter-rotator, a bandpass filter, and a slave laser, wherein
• the optical splitter, the polarization splitter-rotator, the bandpass filter, and the slave laser are sequentially connected;
• the optical splitter comprises the first port, a second port, and a third port, wherein the first port is configured to receive injection light of the master laser, the second port is connected to the first power detector, and the third port is connected to the polarization splitter-rotator;
• the optical splitter is configured such that the injection light enters the optical splitter through the first port, and is output to the polarization splitter-rotator through the third port;
• the polarization splitter-rotator is configured to perform optical splitting and polarization conversion on the injection light comprising:
• the polarization splitter-rotator is configured to split the injection light thereby separating TE mode injection light and TM mode injection light of the injection light, and the polarization splitter-rotator is configured to transmit the TE mode injection light to a first waveguide and the TM mode injection light to a second waveguide;
• the polarization splitter-rotator comprises the first waveguide and the second waveguide, wherein the first waveguide is configured to transmit the TE mode injection light, the second waveguide is configured to receive the TM mode injection light and to transmit the TE mode injection light,
• the first waveguide and the second waveguide are configured to output the TE mode injection light to the bandpass filter, and
• the bandpass filter is configured to inject the TE mode injection light into the slave laser;
• the slave laser is configured to generate a light beam, the third port of the optical splitter is configured to receive the light beam from the slave laser, the first port is configured to output a first part of the light beam to the first power detector, and the second port is configured to output a second part of the light beam to the first power detector;
• the first power detector is configured to detect an optical power of the second part of the light beam, and generate a first detection signal;
• and
• the first controller is configured to perform at least one of current adjustment or temperature adjustment on the slave laser based on the first detection signal, and to change a transmit wavelength of the slave laser, thereby enabling the optical power detected by the first power detector to reach a first preset value.