Principle of optical fiber communication is first necessary to transfer in the sender information (such as voice) into electrical signals, and then modulated onto the laser beam emitted from the laser, so that the intensity of light with the electric signal amplitude (frequency) changes, and sent through an optical fiber; at the receiving end, the detector receives the optical signal converts it into an electric signal, after demodulation to restore the original information.

As information technology increasingly update transmission speed, fiber-optic technology has been widely appreciated and applied. In the multi-microcomputer elevator systems, fiber optic applications fully meet a large number of data communication is correct, reliable, high-speed transmission and processing requirements. Fiber optic technology in the elevator, greatly improving the response speed of the entire control system, the parallel performance of elevator group control system has been significantly improved. Optical fiber communication device on the elevator used mainly by the light source, optical receivers and optical fibers.