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

G.652 single-mode fibers are divided into four categories according to their characteristics: A, B, C, and D. The main differences are in macrobending loss, attenuation coefficient, and PMD coefficient.

G.652.A supports the transmission distance of 10Gbit/s system up to 400km, the transmission distance of 10Gbit/s Ethernet is up to 40km, and the distance supporting 40Gbit/s system is 2km.

G.652.B type optical fiber must support the transmission distance of 10Gbit/s system up to 3000km or more, and the transmission distance of 40Gbit/s system is 80km.

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

The properties of G.652D fiber are basically the same as G.652B fiber, and the attenuation coefficient is the same as G.652C fiber, that is, the system can work in the 1360~1530nm band.

G.652.D is the most stringent index among all G.652 levels and is fully downward compatible. It is structurally the same as ordinary G.652 fiber. It is currently the most advanced non-dispersion shifted fiber for metropolitan area networks.

Characteristics of G.652.A, G.652.B, G.652.C, and G.652.D fiber optic cables