What are the characteristics of optical transmission network in optical fiber transmission 5

Just look at it in the encyclopedia:

Fiber optic communicationsOptical fiber communication is a communication method that uses light waves as carriers and optical fibers as transmission media to transmit information from one place to another, referred to as optical communication.

As far as optical fiber communication technology itself is concerned, it should include the following main parts: optical fiber and cable technology, transmission technology, optical active devices, optical passive devices and optical network technology.

Optical communication mess network function:1.Signal Conversion (Sending Signal to the Hair and Limbs): Converts electrical signals into optical signals.

2.Signal multiplexing: Convergence of multiple narrow signals into one wide signal.

3.Signal relay: long-distance transmission, intermediate relay signal.

4.Signal Steering: Converts the direction in which the signal is transmitted.

5.Signal demultiplexing: Decomposing the multiplexed signal into the original individual signals.

6.Signal Conversion (Received Signal Excitation): Converts an optical signal into an electrical signal.

Signals are transmitted through light waves, and there are three windows for fiber optic low-loss transmission, which are 850, 1310 and 1550nm. The digital signal is calmThe modulation is loaded on top of the light wave for transmission, and the receiver is filtered to obtain a digital signal.

Fiber optic communicationsIt is the use of light in an extremely fine optical fiber.

The optical fiber is a kind of light "wire", its structure is divided into two layers, the middle layer is the fiber core, the diameter is only a few microns, the outer layer of light reflection ability is extremely strong, with glass or quartz shed withered into the "cladding", the outermost layer is also wrapped with a thick layer of plastic, so that the light is tightly enclosed in the optical fiber.

When information is transmitted, words and images become light signals of different intensities, which are transmitted to distant places at a rate of 3 billion times per second. A single optical fiber can transmit tens of millions of words of book information in a matter of seconds.

And no matter how bent it is, as long as the angle of the incident light is appropriate, the Gomo can convey information accurately.

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Optical fiber communication is based on the total reflection of light.

Optical fiber communication technology stands out from optical communication and has become one of the main pillars of modern communication and plays a pivotal role in modern telecommunication networks. As an emerging technology, optical fiber communication is rare in the history of communication for its rapid development and wide application in recent years, and it is also an important symbol of the world's new technological revolution and the main transmission tool of various information in the future information society.

Optical fiber is the abbreviation of optical fiber. Optical fiber communication is a communication method that uses light waves as the information carrier and optical fiber as the transmission medium. In principle, the basic material elements that make up optical fiber communication are optical fibers, light sources, and optical detectors.

In addition to the classification of optical fibers according to the manufacturing process, material composition and optical properties, in applications, optical fibers are often classified according to their uses, which can be divided into optical fibers for communication and optical fibers for sensing.

Light travels in a (total reflection) manner in an optical fiber.

**Very clear description of the problem. If it is refraction, the light will not run out of the optical fibers into the air.

Light travels in a (total reflection) manner in an optical fiber.

Refraction of light: When light is obliquely emitted from one transparent medium into another, the direction of propagation generally changes, which is called refraction of light. Understand:

The refraction of light and the reflection of light occur at the junction of the two mediums, but the reflected light returns to the original medium, and the refracted light enters the other medium, because the light travels at different speeds in two different substances, so the direction of propagation changes at the junction of the two media, which is the refraction of lightNote: at the junction of the two media, both refraction and reflection occur. The speed of light of reflected light is the same as that of incident light, and the speed of light of refracted light is different from that of incident light.

The transmission medium of optical fiber communication technology is mainlyOptical fiber annihilation coarse dimension.

Fiber-optic communication refers to a way of using optical fiber to transmit information, which is a type of wired communication. Light is modulated to carry information. Since the 1980s, fiber optic communication systems have revolutionized the telecommunications industry and are also playing a very important role in the digital age.

Optical fiber communication has many advantages such as large transmission capacity and good confidentiality. Fiber optic communication lines have become the most important wired communication method today. The information to be sent is input into the transmitter at the transmitter, the information is superimposed or modulated onto the carrier as the information signal carrier, and then the modulated carrier is sent to the remote receiver through the transmission medium, and the receiver detunes the original information.

According to the different signal modulation methods, optical fiber communication can be divided into digital optical fiber communication and analog optical fiber communication. The optical fiber communication industry includes optical fiber cables, optical devices, optical equipment, optical communication instruments, optical communication integrated circuits and other fields.

There are two main differences between optical fiber communication and electrical communication: one is to use optical frequency as the carrier frequency to transmit signals, and the other is to use optical cable as the transmission line. Key features:

1) Transmission frequency bandwidth, large communication capacity; (2) Low loss, long transmission distance and high communication quality; (3) Strong anti-dry resistance, wide range of applications; (4) The wire diameter is thin and the weight is light.