Optical module, optical system, optical transceiver module, lidar, and optical amplification system

An optical system, comprising:

• a light beam output module and the optical module, wherein the optical module comprises a first port, a second port, a third port, a first polarization beam combining and splitting module, a second polarization beam combining and splitting module, a polarization adjustment module, and a magnet, wherein:
• the first port and the third port are disposed on a first end face of the first polarization beam combining and splitting module,
• the second port is disposed on a first end face of the second polarization beam combining and splitting module,
• the polarization adjustment module and the magnet are located between the first polarization beam combining and splitting module and the second polarization beam combining and splitting module,
• at least one end face of the polarization adjustment module other than two end faces in a first direction is attached to the magnet, and the magnet is configured to provide magnetism for the polarization adjustment module;
• the first polarization beam combining and splitting module is configured to perform polarization beam splitting on a first light beam input from the first port, to obtain first polarized light having a first polarization state and second polarized light having a second polarization state, wherein the first polarization state and the second polarization state are orthogonal to each other;
• the polarization adjustment module is configured to perform polarization adjustment on the first polarized light input in the first direction to obtain the first polarized light, and perform polarization adjustment on the second polarized light input in the first direction to obtain the second polarized light;
• the second polarization beam combining and splitting module is configured to perform polarization beam combining on the first polarized light and the second polarized light to obtain a second light beam, wherein the second light beam is output from the second port;
• the second polarization beam combining and splitting module is further configured to perform polarization beam splitting on a third light beam input from the second port to obtain third polarized light having the first polarization state and fourth polarized light having the second polarization state;
• the polarization adjustment module is further configured to perform polarization adjustment on the third polarized light input in a second direction to obtain fifth polarized light having the second polarization state, and perform polarization adjustment on the fourth polarized light input in the second direction to obtain sixth polarized light having the first polarization state, wherein the first direction is opposite to the second direction;
• the first polarization beam combining and splitting module is further configured to perform polarization beam combining on the fifth polarized light and the sixth polarized light to obtain a fourth light beam, wherein the fourth light beam is output from the third port;
• and
• wherein the light beam output module is configured to output light beam to the first port of the optical module.