Types of fiber optic transceivers

Main classification of optical fiber

According to the classification of transmission modes, there are two types of optical fibers: multi-mode optical fibers and single-mode optical fibers. Multimode fiber can transmit several modes, while single mode fiber can only transmit one mode for a given operating wavelength. At present, the commonly used multimode fibers are mainly 50/125μm and 62.5/125μm. The core diameter of a single-mode fiber is generally 9/125 μm.

Multimode fiber - the core is relatively thick (50 or 62.5μm), because the geometric size of the fiber (mainly the core diameter d1) is much larger than the wavelength of the light wave (about 1 μm), there will be dozens or even hundreds of types in the fiber. a mode of transmission. At the same time, because of its large intermodal dispersion, the transmission frequency is limited, and it will become more serious with the increase of distance. According to the above characteristics, multimode fibers are mostly used in networks with relatively low transmission rates and relatively short transmission distances, such as local area networks, etc. Such networks usually have many nodes, many joints, and many detours. With the characteristics of a large number and many active devices used per unit fiber length, the use of multimode fibers can reduce network costs.

The core of a single-mode fiber is small (usually about 9 μm) and can only transmit light in one mode. Therefore, its intermodal dispersion is very small, which is suitable for long-distance communication, but there are also material dispersion and waveguide dispersion, so the single-mode fiber has higher requirements on the spectral width and stability of the light source, that is, the spectral width should be narrow and stable. Be good. Single-mode fiber is mostly used in lines with long transmission distance and relatively high transmission rate, such as long-distance trunk transmission, metropolitan area network construction, etc. The current FTTx and HFC networks are dominated by single-mode fiber.

The difference between single-mode fiber optic transceivers and multi-mode fiber optic transceivers

Optical fiber transceiver is an Ethernet transmission medium conversion device that exchanges electrical and optical signals of Ethernet, and the optical fiber that transmits data on the network is divided into multi-mode optical fiber and single-mode optical fiber.

In terms of networking applications, since multi-mode fiber cannot carry out long-distance transmission, it can only be used for networking within and between buildings. However, because multi-mode fiber and the corresponding fiber transceiver are relatively cheap, it is still within a certain range has been applied. Many schools also use multimode fibers when building their internal campus networks.

With the advancement of technology, single-mode fiber has begun to enter long-distance networking operations (from a few kilometers to more than 100 kilometers), and the development momentum is very rapid. In a few years, high-end applications have entered the homes of ordinary people. For example, many homes now use fiber optic transceivers (so-called FTTH mode, fiber-to-the-home) when they open the network, and the use of fiber optic transceivers for networking has become a very common form of radio and television to carry out value-added services.

Using fiber optic transceivers for networking, besides stability, what else is there? That is speed! 100M full-duplex, even higher speed than 100 full-duplex: 1000M full-duplex. It extends the limit of network transmission distance from 100M of twisted pair to more than 100KM, which can easily realize the interconnection between mainboard servers, repeaters, hubs, terminals and terminals. When everyone chooses optical fiber for networking, in order to strengthen their understanding of optical fibers, popularize relevant knowledge, and choose the optical fiber with the best comprehensive performance through all-round consideration.

The above is the basic classification of optical fibers and how to choose suitable optical fiber transceivers for networking. In today's developed information network, Yutai Technology has developed optical fiber transceivers suitable for market needs from the comprehensive consideration of intelligence, security, stability, effectiveness, etc. converters, fiber converters to meet customer needs.