G.652 single-mode optical fiber specific classification G.652A B C D What is the difference

G.652 single-mode fiber is called non-dispersion-shifted fiber, also known as the single-mode fiber with the best performance at 1310nm wavelength. It was put into commercial use in 1983. Its zero dispersion wavelength is 1310nm. It has the least attenuation at a wavelength of 1550nm, but has a large positive dispersion. Its dispersion coefficient is 18ps/(nm.km). Therefore, the working wavelength of G.652 can be selected from 1310nm or 1510nm. It is the most widely used single-mode fiber.

G.652 single-mode fiber is divided into four categories according to its characteristics, A, B, C, and D. The main differences are in macrobending loss, attenuation coefficient, and PMD coefficient. The reason for this difference lies in the manufacturing technology. In 1998, Lucent adopted a new production technology to eliminate the water absorption peak near 1383nm formed by the OH radical in the raw material as much as possible, so that the loss of the optical fiber is completely determined by the intrinsic loss of the pier.

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

2. G.652.B type optical fiber supports a transmission distance of more than 3000km for 10Gbit/s system, and 80km for 40Gbit/s system.

3. G.652.C type optical fiber, the basic properties are the same as G.652A, but the attenuation coefficient at 1550nm is lower, and the water absorption peak near 1380nm is eliminated, that is, the system can work in the 1360~1530nm band.

4. The properties of G.652D optical fiber are basically the same as those of G.652B optical fiber, and the attenuation coefficient is the same as that of G.652C optical fiber, that is, the system can work in the 1360~1530nm band. G.652.D is the most stringent indicator among all G.652 levels and is fully backward compatible. It is no different from ordinary G.652 optical fiber in structure and is currently the most advanced non-dispersion-shifted optical fiber for metropolitan area networks.