What is the role of optical fiber communication in elevators?

With IT increasingly updating transmission speed , fiber-optic technology has been widely appreciated and applications. Optical fiber communication apparatus on the elevator by the light source is mainly used , and a photo receiver optical fibers . Elevator system in a multi- computer , fiber optic applications fully meet a lot of data communication is correct, reliable , high-speed transmission and processing requirements. Fiber optic technology in the elevator , greatly improving the speed of response of the control system , the parallel performance elevator group control system has been significantly improved .
1 . Light source
Microcomputer control system output signal to an electrical signal , and optical fiber signal transmission system , therefore , a microcomputer system in order to generate electrical signals transmitted in an optical fiber is first necessary to convert electrical signals to optical signals . Electro-optical conversion is one such source devices.
First, light is converted into an optical signal to an electrical signal , optical signal transmission fiber again . In fiber-optic systems, the light source has a very important position . Currently available as a fiber source incandescent , lasers and semiconductor light source . A semiconductor light source using a semiconductor PN junction to convert electrical energy into light energy , common semiconductor light -emitting semiconductor diodes (LED) and laser diodes (LD).
Semiconductor light sources because of their small size, light weight , simple structure, easy to use, and easy- compatible optical fiber , etc., in the optical transmission system has been widely used.
2 . Photoreceptor
Optical signal in the fiber transmission was received before the computer system , the first to be restored into a corresponding electrical signal . This conversion is achieved by the optical receiver . Action by the optical receiver is transmitted over the fiber optic signal is converted into an electrical signal , and then the electrical signal is processed by the control system . The optical receiver in accordance with the principles of the photoelectric effect , irradiating a semiconductor PN junction , a semiconductor PN junction will absorb the light generated carriers , the photoelectric effect resulting PN junction , thereby converting the optical signal into an electrical signal. Currently used in optical fiber systems there are receivers semiconductor semiconductor photodiode , phototransistor , photomultiplier tubes and light batteries. Not only can the incident phototransistor signal into an electrical signal , and can amplify electrical signals , which can be a good match with the control system interface circuit , so the phototransistor of the most widely used .

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