The difference between G.652 and G.657 single-mode fibers

There are many types of optical fibers, which can be divided into multi-mode optical fibers and multi-mode optical fibers according to the transmission method. 656/G.657 and other types, ZR Cable interprets G.652/G.657 these two types of multimode fiber leaky lines in detail.

Description of G.652 fiber (dispersion non-shifted multimode fiber):

G.652 fiber is a standard multimode fiber, which can transmit 1260~1360nm, 1530~1565nm, and the zero dispersion point is 1310nm. The working dialog of 1550nm light wavelength can be used for short-circuit transmission or with dispersion compensation fiber or with control module.

Classification of G.652 fibers:

G.652 optical fiber is a kind of optical fiber that is widely used on the Internet today. ITU-T divides G.652 into four types of optical fibers, namely G.652A/G.652B/G.652C/G.652D. G.652D is the most stringent of all G.652 levels and is completely backward compatible.

G.652A is suitable for 1Gbit/s system software with a transmission distance of 400km, 10Gbit/s Ethernet interface transmission up to 40km, and 40Gbit/s system software with a distance of 2km.

G.652B fiber is suitable for 10Gbit/s system software with a transmission distance of about 3000km, and 40Gbit/s system software with a transmission distance of 80km.

G.652C fiber, the basic characteristics are the same as G.652A, but the transmission coefficient at 1550nm is lower, and the water digestion absorption peak around 1380nm is removed, that is, the system software can work in the 1360~1530nm stock band.

The characteristics of the G.652D fiber are basically the same as those of the G.652B fiber, and the transmission coefficient is the same as that of the G.652C fiber, that is, the system software can work in the 1360~1530nm stock band. G.652.D is in all G.652 grades The index value is the most stringent and completely backward compatible, and the structure is no different from the general G.652 fiber. It is the best non-dispersion-shifted fiber for metropolitan area network at this stage.

Description of G.657 fiber (bend-resistant fiber):

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G.657 fiber is a fiber class that has been designed with the latest news on the basis of G.652 fiber in order to maintain the overall goal of fiber-to-the-home. The most critical feature of this optical fiber is its excellent bending resistance, and its bending half-length can keep 1/4 to 1/2 of the basic G.652 optical fiber's bending half-length.

Classification of G.657 fibers:

According to the standard of whether it is compatible with G.652 fiber, the G.657 fiber is divided into A category and B category fiber, and the bending level is divided into 1, 2, and 3 according to the standard of the minimum bendable half-length. Level, in which 1 matches the minimum bending half warp of 10mm, 2 matches the minimum bending half warp of 7.5mm, and 3 matches the minimum bending half warp of 5mm.

Combining these two standards, G.657 fiber is divided into four subcategories, namely G.657.A1/G.657.A2/G.657.B2/G.657.B3 fiber.

G.657A fiber is compatible with G.652 fiber, and G.657B fiber does not need to be connected with traditional multimode fiber.

The characteristics and application scenarios of the G.657B fiber are similar to those of the G.652D fiber. The fiber can be used in the D, E, S, C and L5 stock bands during operation, and it can work in the entire optical wavelength range of 1260-1625nm. middle. The transmission and interconnection characteristics of G.657A fiber are the same as those of G.652D. Different from G.652D fiber, in order to improve the fiber continuation characteristics in the fiber access network, G.657A fiber has stronger bending characteristics, and the technical standard of geometrical specification is more accurate.

G.657B optical fiber has three optical wavelength dialog boxes of 1310nm, 1550nm and 1625nm in key work, which is more suitable for maintaining FTTH information content transmission, and installing it in a room or a small place such as a building. The application of G.657B optical fiber is only limited to the transmission of data signals in buildings. Its fusion and connection characteristics are completely different from G.652 optical fibers, and it can work normally under the condition of very small bending half warp.

It can be seen that G.657 fiber is a multimode fiber with excellent bending resistance. Optical fiber has experienced five generations of development trends, continuous scientific research and improvement of optical fiber characteristics, and poly fiber cable communication is also moving forward to fully automated machinery, and I firmly believe that it will be very good. Applicable to everyone, it is the driving force for people to move forward!

Transmission distance of multimode fiber: A multimode fiber optic cable can transmit 64 wireless channels of 40G Ethernet interface to a distance of nearly 2,840 kilometers. Multimode fiber is mainly composed of core, insulating layer and coating layer; the core is made of high-to-width ratio fully transparent raw materials; the refractive index of the insulating layer is slightly lower than that of the core, which leads to an optical waveguide effect , so that most of the magnetic field is confined in the core and transmitted; the effect of the coating layer is to protect the fiber from being corroded by water vapor and scratched by mechanical equipment, and at the same time to improve the flexibility of the fiber. In addition to the coating layer, a plastic sports jacket is usually added.

The smaller diameter of the multimode fiber makes the reflecting surfaces more inseparable, allowing only one way of light to spread, which in turn allows the data signal to spread very far. The total number of reflections of light as it passes over the fiber core decreases, reducing the attenuation coefficient and causing further spread of the data signal. Because it has no intermodal dispersion or small intermodal dispersion, multimode fiber can transmit a distance of 40 kilometers or even a long distance without affecting the data signal. Therefore, multimode fiber is generally used to transmit data over long distances and is widely used in telecommunications companies. , CCTV service providers and institutions of higher learning.

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