On optical fiber technology in radio communications and television ...

Technology Center

Fujian Radio Film and TV group left Germany

Abstract: This paper describes the use of optical fiber communication, optical characteristics of optical fiber transmission, the implementation of SDH technology in the field of transmission of radio and TV signal, return the application. An example is carried through the network of long distance fiber optic, remote, multi-point real-time interactive TV, live shows, and use of fiber optic connector tips .

Keywords: fiber optic communication systems SDH optical fiber transmission characteristics of optical fiber technology connection

In recent years, optical technology fiber communication system in the cable television and other communication systems are widely used, people become more familiar with optical communications and technology optical fiber communication matures.

In the field of radio signals and television broadcasters to fiber optic transmission media as a much greater importance and application.

fiber optical communication system 1 in the form of basic system fiber optic communication system is based, such as carrier waves through optical fiber communication transmission system. System optical fiber communication consists of optical transmitters, receivers, optical repeaters, optical fiber connectors and couplers and other passive devices composed of five sections. Its basic form in Figure 1

Optics fiber communication is the basic material, divided into the optical transmitter and optical the optical receiver, which directly affects the performance of the transmission quality of the optical communication system of the communication system to the fiber optical signal source sent to the transmitter, the optical transmitter sucked signal light modulated optical signal by the optical fiber transmission of the remote control input, the receiving end of optical sensors inside the gloss will restore the optical signal of the fiber into electrical signals, amplification, shaping, regeneration , the recovery of restoration output. Optical systems for fiber communication repeaters long range necessary, its role is to read the long fiber optical attenuation and distortion by the weak signal after amplification, the distortion of the pulse waveform set shaped, a certain intensity of light correcting signal generated to continue forward to ensure good communication quality.

The function of fiber optics communication of each party:

(1) optical transmitter: optical transmitter to perform the conversion of the signal electrical / optical optical. It consists of a light source, the reader and the modulator. Its function is to come from the signal source (video, audio or radio frequency) signal sent to the electric light source is modulated wave modulated light, and then modulated optical signal coupled to the optical fiber to transfer.

(2) optical receiver: optical receiver is an optical / electrical conversion of optics. It consists of optical sensors and optical amplifiers. Its function is to transmit optical fiber or an optical cable to the optical signal by the optical detector into electrical signals (video, audio or RF) and then the weak electrical signal amplified by the amplifier circuit to a sufficient level, sent to the receiving user to go.

(3) or fiber cable. Optical fiber or of the formula channel transmission cable serves to adjust the optical transmitter signal was sent through the optical fiber or optical distance fiber transmission, the coupling to the receiving end of the optical detector until to send the information to complete the task.

(4) Repeater: repeater by the detector, the light source of light and regeneration circuit saves. Its role is twofold: one is the compensation for the transmission of optical signals in optical fiber by the decay, the other is the distortion correction signal pulse

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(5) fiber optic connectors, couplers and other passive components: Since the fiber length or fiber optic cable driven by technology and fiber optic cable construction conditions , and the length of the drawn fiber is limited (as tested one kilometer). Therefore, there may be a multi-fiber fiber optic lines connected to this problem. Thus, the connection between the optical fiber, fiber, and coupled to the optical connection on the fiber optic connectors, couplers and other passive components used is essential.

Second Characteristics transmission fiber (cable)

High purity optical fiber is composed of glass materials. The line fiber of the optical fiber, fiber optic connectors, the fiber fiber optic connector is the main form. Fiber optic lines, is used to receive the actual number of fibers in the fiber optic cable

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