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On Optical Fiber Communication Technology In Radio And Television Transmission In
Technology Center of Fujian Radio Film and TV Group leaves Germany
Abstract: This paper describes the use of optical fiber communication, optical fiber transmission characteristics, SDH transmission technology implementation in the field of radio and television broadcast signal, return the application. An example is carried out through long-distance fiber optic network, remote, multi-point real-time interactive live television to achieve; and the use of fiber optic connector tips.
Key words: optical fiber communication systems SDH optical fiber transmission characteristics of optical fiber connection technology
Recent years, optical fiber communication technology in the cable television system and other communication systems are very widely used, people become more familiar with optical communications and optical fiber communication technology matures. In the field of radio and television broadcasting television signals to optical fiber transmission as a carrier of much greater importance and application.
Optical fiber communication system 1. Basic form the system Optical fiber communication system is based, as the carrier waves to optical fiber communication system transmission medium. Optical fiber communication system consists of optical transmitter, optical receiver, optical repeaters, fiber optic connectors and couplers and other passive devices composed of five parts. Its basic form shown in Figure 1.
Optical fiber communication system is the core equipment, Optical divided into the optical transmitter and optical receiver, which directly affects the performance of the transmission quality of the communication system. Optical fiber communication system from the signal source sent to the sender's Optical, optical transmitter sucked light signals modulated optical signals through the input optical fiber transmission to the remote; the receiving end of Optical detectors within the bright will restore the optical signal from the fiber into electrical signals, amplifying, shaping, regeneration recovery restore output. Optical fiber communication systems for long range repeaters needed, its role is to read the long optical fiber attenuation and distortion by the weak signal after amplification, on the distortion of pulse waveform shaping, a certain intensity of light generated correction signal, to continue to front to ensure good communication quality.
Optical fiber communication system function of each part:
(1) optical transmitter: optical transmitter to achieve electrical / optical signal conversion Optical. It consists of light source, the drive and the modulator. Its function is to come from the signal source (video, audio or radio frequency) electrical signals sent to the light source is modulated into modulated light wave, and then modulated optical signals coupled to the optical fiber to transfer.
(2) optical receiver: optical receiver is an optical / electrical conversion of the Optical. It consists of optical detectors and optical amplifier. Its function is to transmit optical fiber or optical cable to the optical signal by the optical detector into electrical signals (video, audio or RF), and then, then the weak electrical signals amplified by the amplifier circuit to a sufficient level, sent to user receiver to go.
(3) fiber or cable: optical fiber or cable transmission channel form. Its function is to adjust the transmitter optical signal has been sent through optical fiber or optical fiber transmission distance, the coupling to the receiving end of the optical detector up, send the information to complete the task.
(4) Repeaters: Repeaters by the light detector, light source and judgments regeneration circuit. Its role is twofold: One is the compensation for optical signal transmission in optical fiber by the decay; the other is the pulse waveform distortion correction.
(5) fiber optic connectors, couplers and other passive components: Since the fiber or fiber-optic cable length drawn by the technology and fiber optic cable construction conditions, and the drawn length of fiber is limited (such as 1Km). Therefore, there may be a multi-fiber fiber optic lines connected to the problem. Thus, the connection between fiber optic, fiber, and coupled with the Optical connection on the fiber optic connectors, couplers and other passive components used is essential.
2. Fiber (cable) transmission characteristics
High-purity optical fiber is made of glass materials. Fiber line from the optical fiber, optical fiber connectors, fiber optic connector form. Fiber is the main fiber optic lines, is used to accommodate the actual number of fibers in the fiber optic cable
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