Fmcw light detection and ranging system

A mobile device, comprising:

• a Frequency-Modulated Continuous Wave (FMCW) light detection and ranging (LiDAR) system, wherein, the FMCW LiDAR system comprises:
• a laser source, configured to emit a frequency-swept laser beam;
• a light engine, comprising an optical transmitter/receiver, wherein the light engine is configured to receive the frequency-swept laser beam, and transmit, as a detection beam, at least a part of the frequency-swept laser beam from the optical transmitter/receiver, and the optical transmitter/receiver is further configured to receive a reflected beam formed after the detection beam is incident on an obstacle;
• a scanning component, arranged on one side of the optical transmitter/receiver and configured to deflect the detection beam to perform scanning on the detection beam;
• and
• a birefringent component, configured to compensate for a transmission and reception offset angle caused by motion of the scanning component, to enable the detection beam and the reflected beam to be transmitted and received by a same port of the optical transmitter/receiver.