What are the relevant studies on the application of optical fiber communication at home and abroad?

Much more. As long as it comes to communication monitoring == are all.

<>1. Optical fiber communication has many advantages: it has a large transmission frequency bandwidth, a large positive signal capacity; Low transmission loss and long relay distance; The wire diameter is thin and the weight is light, and the original leakage material is quartz, which saves metal materials and is conducive to the rational use of resources; Strong insulation and anti-electromagnetic interference performance; It also has the advantages of strong corrosion resistance, strong radiation resistance, good turnability, no electric sparks, small leakage, strong confidentiality, etc., and can be used in special environments or military.

2. The principle of optical broadband and early fiber communication is: at the sending end, the transmitted information (such as voice) should 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.

3. With the increasing speed of information technology transmission, optical fiber technology has been widely valued and applied. In the multi-microcomputer elevator system, the application of optical fiber fully meets the requirements of correct, reliable and high-speed transmission and processing of a large number of data communications. The application of optical fiber technology in elevators has greatly improved the response speed of the entire control system, and the parallel group control performance of the elevator system has been significantly improved.

The optical fiber communication device used in the elevator is mainly composed of a light source, a photoelectric receiver and an optical fiber.

Optical fiber is an important means of communication transmission;

Trunk transmission, such as the eight horizontal and eight vertical optical cable trunk lines built in China back then, is the main artery of national long-distance broadband transmission;

Optical fiber can be used in all other scenarios that require signal transmission, except for those where construction conditions are limited;

Everyday visible, such as home fiber broadband, urban transmission networks, etc.

The biggest advantage of fiber optic communication over commonly used cable communication is that fiber optics can transmit a larger amount of bandwidth, and fiber optics can transmit longer distances without relays.

In terms of resources, the use of optical fibers can save metal resources.

(1) Large communication capacity and long transmission distance; The potential bandwidth of one fiber can reach 20thz. With such a bandwidth, it only takes about a second to transmit all the written data of human beings, ancient and modern, Chinese and foreign. At present, the 400Gbit S system has been put into commercial use.

The loss of optical fibers is extremely low, and at the vicinity of the wavelength of light, the loss of quartz fiber can be lower, which is lower than the loss of any current transmission medium. As a result, the transmission distance without a relay can be several times.

10. Even hundreds of kilometers. (2) Small signal crosstalk and good confidentiality performance; (3) Anti-electromagnetic interference, good transmission quality, electrical communication can not solve all kinds of electromagnetic interference problems, only optical fiber communication is not subject to all kinds of electromagnetic interference. (4) The optical fiber is small in size and light in weight, which is easy to lay and transport; (5) The material is abundant, the environmental protection is good, and it is conducive to saving non-ferrous metal copper.

6) No radiation, difficult to eavesdrop, because the light waves transmitted by the optical fiber cannot escape outside the optical fiber. (7) The optical cable has strong adaptability and long life.