The transmission mode of optical fiber, how does optical fiber transmit signals? You ll understand a

Cable + twisted pair.

Fiber optic stage. That is, what we call the final stage, at this time, the corresponding auxiliary equipment is more perfect, the data processing capacity is stronger, and the scalability is better. The development is also very fast, and the access equipment has been adjusted, so it can be said that this is a one-step comprehensive communication stage.

Two theories can be used to analyze the transport of light in optical fibers: the theory of ray optics (i.e., geometrical optics) and the theory of wave optics. The theory of ray optics is a method of replacing the optical energy transmission route with light rays, which is easy to obtain simple and intuitive analysis results for multi-mode fibers with optical wavelengths far smaller than the size of optical waveguides, but for complex problems, ray optics can only give a relatively rough concept.

Wave optics treats light in an optical fiber as a classical electromagnetic field, so the light field must obey Maxwell's equations and all boundary conditions. Starting from the wave equation and the boundary conditions of the electromagnetic field, comprehensive and correct analytical or numerical results can be obtained, and the allowable field structure form (i.e., mode) in the waveguide can be given.

Nowadays, the Internet industry is growing day by day, and people's demand for the Internet is increasing.

Bandwidth requirements are also increasing. Take the previous network speed compared with the current network speed, we can find that the speed of the network speed has almost doubled, from the previous combustion 1m, 2m to the current 50m, 100m, and the current fiber broadband trembling, so how does the current optical fiber transmit signals? Let's take a look.

Optical fiber communication. The principle of skin hole virtual is not complicated, it is that at the sending end, the transmitted information (such as voice) must first be turned into an electrical signal, and then modulated to the laser beam emitted by the laser, so that the intensity of the light changes with the amplitude (frequency) of the electrical signal, and is sent out through the optical fiber; At the receiving end, the detector receives the optical signal and converts it into an electrical signal, which is demodulated and restored to the original information.

Optical communication is made of light-emitting diodes.

LEDs or injected laser diodes (ILDs) emit light signals that propagate along the light** and have a PIN or APD photodiode at the other end.

Receives signals as a geophone. The modulation of the optical carrier is the amplitude shift keying method, also known as intensity modulation. It is typical to represent two binary numbers in terms of the appearance and disappearance of light at a given frequency.

Both LED and ILD signals can be modulated in this way, with the PIN and ILD detectors responding directly to luminance modulation.

Optical fiber communication is a communication method that uses light waves to transmit information in optical fibers. Due to the significant advantages of high directionality, high coherence, and high monochromaticity, the light wave in optical fiber communication is mainly laser, so it is also called laser-fiber communication.

Power amplification: The optical amplifier is placed in front of the optical transmitter to increase the optical power of the incoming fiber.

The optical power of the entire line system is improved. **Relay amplification: When the building complex is large or the distance between buildings is long, it can play the role of relay amplification and improve the optical power. Pre-amplification: After the photodetector at the receiving end, it will be ***.

Amplification is performed to improve receiving.

Fiber optic cables are not easy to branch, because they transmit optical signals, so they are generally used for point-to-point connections. Optical bus topology.

Experimental multipoint systems have been built, but they are still too expensive. In principle, due to the small power loss and attenuation of optical fiber, there is a large bandwidth potential, so the number of joints that can be supported by optical fiber is higher than that of twisted pair or coaxial cable.

Much more. The low-cost and reliable transmitter is a wavelength LED LED that can support a transmission rate of 100Mbps and a range of LANs. Laser diodes are expensive transmitters and do not meet the million-hour lifetime requirements.

The LED detector PIN that operates at wavelength is also a low-cost receiver.

The application of optical fiber is also very extensive, as large as the link of enterprise servers, as small as the Internet access of family households, it can be involved, and now the network has entered thousands of households, which can be said to be integrated into our lives, and there will be faster and more convenient 5G networks in the future.

It's worth looking forward to.

1. The function of the optical fiber transmission system: the information source replaces the user's information with the original electrical signal, which is called the baseband signal.

2. First, attenuation is reduced. At the current state of technology, the attenuation of optical fiber has been reduced to 0 2 decibels per kilometer or even lower. In this way, optical fiber can be used as a cavity for long-distance relayless transmission, and its performance is much better than that of ordinary coaxial cable microwave terrestrial transmission.

Second, the bandwidth of optical fiber frequency can pass through more information.

3. Optical cable is used to transmit optical signals, and its role is only as a physical device, and the specific role is determined by the equipment on both sides, which can transmit data (such as boring Internet access), voice, etc.

Summary. Hello dear, happy to answer your <>

Optical fibers are optical wave-guiding devices used to transmit optical signals. When light hits one port of the fiber, it goes through several steps of transmission in the fiber:1

Refraction: When light enters one port of the fiber, it is refracted into the core, and the transmission wavelengths generally used are 850nm and 1310nm or Reflection: If the light is reflected on the boundary between the core and the cladding, it can be transmitted between the core and the cladding many times, thereby enhancing the transmission distance and signal strength.

3.Diffraction: When light hits the surface of a rough core, the light travels along different transport paths, which is the phenomenon of diffraction.

4.Scattering: The molecules in the core scatter light, which means that light can be dispersed in any direction around the fiber, reducing the <>intensity of the signal

How light is transmitted in optical fibers.

Hello dear, happy to answer your <>

Optical fibers are optical wave-guiding devices used to transmit optical signals. When light hits one port of the fiber, it goes through several steps of transmission in the fiber:1

Refraction: When light enters a port of the fiber, it is refracted into the core, and the transmission wave is generally used The chain length is 850nm and 1310nm or Reflection: If the light is reflected on the boundary between the core and the cladding, it can be transmitted between the core and the cladding many times, thereby enhancing the transmission distance and signal strength.

3.Diffraction: When light hits the surface of a rough core, the light travels along different transport paths, which is the phenomenon of diffraction.

4.Scattering: The molecules in the core scatter light, which means that the light can be dispersed in any direction around the fiber, reducing the <>intensity of the signal

The following are related extensions, I hope it will be helpful for you to <>< early

The transmission of optical rubber in optical fibers is achieved through optical effects such as reflection, refraction, and scattering. At the same time, the use of complex transmission protocols can ensure the accuracy of signal transmission, making optical fiber more and more widely used<>

Summary. The principle of optical fiber transmission optical fiber transmission is the use of the principle of total reflection of light, the ray will produce total reflection at the interface between the fiber core and the cladding, and form a light lock inside the fiber core to propagate forward, even if the curved road light will not shoot out of the optical fiber. It is just a constant reflection on the uniform and transparent glass core, which is conducted from one end to the other.

Due to the small diameter of the fiber core, the optical signal loss will be much lower than that of the electrical signal transmission loss in the network cable.

The principle of optical fiber transmissionOptical fiber transmission is the use of the principle of universal skin reflection of light, the ray will produce total reflection at the interface between the fiber core and the cladding, and form a light lock inside the fiber core to propagate forward, even if the curved road light will not shoot out of the optical fiber. It is just a constant reflection on the uniform and transparent glass core, which is conducted from one end to the other. Due to the small diameter of the fiber core, the optical signal loss will be much lower than that of the electrical signal transmission loss in the network cable.

I'm sorry I don't understand, but can you elaborate on that?

The principle of optical fiber transmissionOptical fiber transmission is the use of the principle of universal skin reflection of light, the ray will produce total reflection at the interface between the fiber core and the cladding, and form a light lock inside the fiber core to propagate forward, even if the curved road light will not shoot out of the optical fiber. It is just a constant reflection on the uniform and transparent glass core, which is conducted from one end to the other. Due to the small diameter of the fiber core, the optical signal loss will be much lower than that of the electrical signal transmission loss in the network cable.

The principle of optical fiber transmission of light is described as follows:

1. Because the propagation speed of light in different substances is different, when light is emitted from one substance to another, refraction and reflection will occur at the intersection of the two substances, and the angle of the refracted light will change with the change of the angular fiber foci of the incident light.

2. When the angle of the incident light reaches or exceeds a certain angle, the refracted light will disappear, and all the incident light will be reflected back, which is the total reflection of light.

3. The refraction angle of different substances to the same wavelength of light is different, that is, different substances have different optical refractive indexes, and the refraction angles of the same substances to different waves of vertical branch light are also different, and optical fiber communication is formed based on the above principles.