What’s the Difference Between Legacy G.652 and G.652.D?

G.652.D fiber is the most current subcategory of G.652 fiber. What’s the difference between legacy G.652 fiber and G.652.D fiber? Compared with G.652.A fiber and G.652.B fiber, G.652.D fiber eliminates the water peak for full spectrum operation. Conventional G.652.A and G.652.B are not optimized for wavelength-division multiplexing (WDN) applications due to the high attenuation in the E-band region (1360-1460 nm), which is the water peak band. The G.652.D fiber has been developed to specifically reduce the water peak at the 1383nm wavelength range. So G.652.D fiber optic cable can be used in the wavelength regions 1310 nm and 1550 nm, and supporting Coarse WDM (CWDM) transmission.

Although both G.652.C and G.652.D offer low water peak at 1383 nm, the G.652.D fiber specification shows superior PMD performance than G.652.C fiber, which is 0.2 ps/sqrt(km) in G.652.D vs. 0.5 ps/sqrt(km) in G.652.C.