Optical fiber communication
Abstract: optical fiber communication is to wave as the carrier, to the optical fiber as transmission medium is a means of
communication, has become one of the main pillars of modern communication. This paper mainly introduces what is the optical fiber communication, optical fiber communication, optical fiber communication system and optical fiber
communication. The future development trend of fiber optical communication, and learning a few feeling.
Key words: optical fiber communication network development trend.
In the study of optical fiber communication"" before I only
heard fiber this noun, but does not know what is the optical fiber communication, also do not know what is the role of optical fiber communication. But the study of the optical fiber
communication, I know a lot about optical fiber communication knowledge, let me know what is the optical fiber
communications cable, what is, what is ADP, PDH, SDH, WDM etc.. Now let me introduce what I know about optical fiber communication knowledge.
What is the optical fiber communications.
Optical fiber communication is to light as the carrier of
information, with the optical fiber as transmission medium is a
means of communication. In principle, constitute the basic elements of optical fiber communication optical fiber, a light source and a light detector. Optical fiber in addition to the manufacturing process, material composition and optical properties for classification, in the application of the optical fiber, used to use for classification, can be divided into communication and optical fiber sensor with optical fiber. Transmission medium optical fiber is divided into general and special two, and functional devices for optical fiber refers to the amplification, shaping, frequency divider, frequency,
modulation and optical oscillation features such as optical fiber, and often a function of the device appeared in the form of. Two. The characteristics of optical network technology
The existing network composed of optical transmission system and electronic nodes, optical technology for two electronic node point-to-point transmission, at each node electronic light signal are converted into electrical signals by electronic node electric treatment, a two network edge connection between nodes
usually multi-hop connection, this will increase the transmission delay, the electronic node processing burden is overweight, limiting network node throughput. Since 90 time, with the
development of optical fiber communication technology rapid development, many scholars put forward " all-optical network" concept, the intention is to signal in the form of light across the entire network, directly in optical domain signal transmission, regeneration and switching / routing, the intermediate without any photoelectric conversion, to achieve full transparency realize, at any time, anywhere, the transmission of any format ideal target signal. But because the optical device technical
limitations, the present all-optical network coverage is also very small, to expand the network coverage, must through the photoelectric conversion to eliminate the optical signal in the transmission process of accumulated damage ( attenuation, dispersion, nonlinear effect), network maintenance, control and management. Therefore, what is now known as " network" is made of high performance photoelectric conversion device is connected to numerous optical transparent subnet collection, is about" ITU-T optical transport network " of the concept of popular opinion.
The three optical fiber communication system.
( 1) optical transmitter
The optical transmitter is the realization of the electro / optical conversion Guangduan ji. It consists of light source, driver and modulator consists of its function is to come from the electric machine electric signal to the light emitted from the light modulation, a modulated light wave, and then the modulated optical signals are coupled to an optical fiber or cable to transmit. Electric machine is a conventional electronic communication equipment.
( 2) optical receiver
The light receiver is to realize the optical / electrical converter Guangduan ji. It consists of a light detector and optical amplifier. Its function is to transmit optical fiber or cable to the optical signal, the optical detector is converted into electrical signals, and then, the weak electrical signals are amplified by an
amplifying circuit to a sufficient level, to the receiving end of the electrical terminal drain to.
( 3) optical fiber or cable
Optical fiber or optical cable optical transmission path. Its function is to sending a modulated optical signal, the optical fiber or cable for long distance transmission, the receiving
terminal is coupled to the optical detector to transmit
information, to complete the task.
( 4) repeater
Repeaters by the light detector, light source and decision regeneration circuit. Its role has two: one is the compensation optical signal in the optical fiber transmission by attenuation; another is on the pulse waveform distortion in administrative. ( 5) fiber optic connectors, couplers and passive devices Because the optical fiber or cable length by optical fiber
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