Multi-mode laser apparatus, optical amplifier, and optical transmit module

A multi-mode laser apparatus, comprising a multi-mode laser, a mode demultiplexer, and X Bragg gratings, wherein

• the multi-mode laser is configured to generate laser light comprising a plurality of modes;
• the mode demultiplexer is configured to decompose the laser light having the plurality of modes into X channels of laser light in different modes, X is an integer greater than 1, the mode demultiplexer comprises X ports, the X ports are configured to output the X channels of laser light, the X ports are connected to the X Bragg gratings, and the X ports are in one-to-one correspondence with the X Bragg gratings;
• the X Bragg gratings are configured to:
• reflect the X channels of laser light, and transmit the reflected X channels of laser light to the mode demultiplexer, and the X Bragg gratings are further configured to:
• transmit the X channels of laser light, and output the transmitted X channels of laser light;
• and
• the mode demultiplexer is further configured to:
• combine the reflected X channels of laser light to obtain excitation laser light, and transmit the excitation laser light to the multi-mode laser, wherein the excitation laser light is used as an excitation source of the multi-mode laser.

An optical amplifier, comprising an amplifier group and a multi-mode laser apparatus, wherein the multi-mode laser apparatus comprises a multi-mode laser, a mode scrambler, a mode demultiplexer, and Y Bragg gratings, wherein

• the multi-mode laser is configured to generate laser light comprising a plurality of modes;
• the mode scrambler is configured to:
• equalize power of laser light in different modes in the laser light having the plurality of modes, and output equalized laser light;
• the mode demultiplexer is configured to decompose the equalized laser light into M channels of laser light in different modes, M is an integer greater than 1, the mode demultiplexer comprises M output ports, X ports of the M output ports are configured to output X channels of laser light in the M channels of laser light, Y ports of the M output ports are configured to output Y channels of laser light in the M channels of laser light, X and Y are integers greater than 0, the Y ports are connected to the Y Bragg gratings, and the Y ports are in one-to-one correspondence with the Y Bragg gratings;
• the Y Bragg gratings are configured to:
• reflect the Y channels of laser light, and transmit the reflected Y channels of laser light to the mode demultiplexer;
• the mode demultiplexer is further configured to transmit the reflected Y channels of laser light to the mode scrambler;
• and
• the mode scrambler is further configured to:
• obtain excitation laser light based on the reflected Y channels of laser light, and transmit the excitation laser light to the multi-mode laser, wherein the excitation laser light is used as an excitation source of the multi-mode laser;
• and
• the amplifier group comprises P amplifiers, P is an integer less than or equal to X and greater than or equal to X/2, and the P amplifiers are configured to:
• receive X channels of first optical signals and the X channels of laser light, and amplify the X channels of first optical signals based on the X channels of laser light to obtain X channels of second optical signals.

An optical transmit module, comprising a modulator group and a multi-mode laser apparatus, wherein the multi-mode laser apparatus comprises a multi-mode laser, a mode scrambler, a mode demultiplexer, and Y Bragg gratings, wherein

• the multi-mode laser is configured to generate laser light comprising a plurality of modes;
• the mode scrambler is configured to:
• equalize power of laser light in different modes in the laser light having the plurality of modes, and output equalized laser light;
• the mode demultiplexer is configured to decompose the equalized laser light into M channels of laser light in different modes, M is an integer greater than 1, the mode demultiplexer comprises M output ports, X ports of the M output ports are configured to output X channels of laser light in the M channels of laser light, Y ports of the M output ports are configured to output Y channels of laser light in the M channels of laser light, X and Y are integers greater than 0, the Y ports are connected to the Y Bragg gratings, and the Y ports are in one-to-one correspondence with the Y Bragg gratings;
• the Y Bragg gratings are configured to:
• reflect the Y channels of laser light, and transmit the reflected Y channels of laser light to the mode demultiplexer;
• the mode demultiplexer is further configured to transmit the reflected Y channels of laser light to the mode scrambler;
• and
• the mode scrambler is further configured to:
• obtain excitation laser light based on the reflected Y channels of laser light, and transmit the excitation laser light to the multi-mode laser, wherein the excitation laser light is used as an excitation source of the multi-mode laser;
• and
• the modulator group comprises X modulators, the X modulators are in one-to-one correspondence with the X channels of laser light, and the X modulators are configured to modulate the X channels of laser light based on an electrical signal to obtain X channels of optical signals.