What are the main fiber used for the construction of transmission network

There are three main G.652 conventional single-mode fiber G.653 dispersion-shifted single-mode fiber and G.655 nonzero dispersion shifted fiber.

 G.652 single-mode fiber in the C band 1530 ~ 1565nm and L-band 1565 ~ 1625nm dispersion larger, typically 17 ~ 22psnm • km, the system rates up to 2.5Gbit / s or more, the need for dispersion compensation in 10 Gbit / s system when the cost of dispersion compensation, it is the laying of the most common kind of fiber in the current transmission network.

G.653 dispersion shifted fiber in the C-band and L-band dispersion is generally -1 ~ 3.5psnm • km at 1550nm zero dispersion, the system rates up to 20Gbit / s and 40Gbit / s single wavelength ultra-long haul The best fiber. However, because of its zero-dispersion characteristics, using DWDM expansion, there will be nonlinear effects result in signal crosstalk, resulting in four-wave mixing FWM in, and therefore not suitable for using the DWDM.

G.655 non-zero dispersion shifted fiber: of G.655 NZDSF dispersion in C-band for 1 ~ 6psnm km in the L-band dispersion is generally 6 ~ 10psnm • km, a smaller dispersion, to avoid zero dispersion region, inhibited both the four-wave mixing FWM in for DWDM expansion, high-speed system can also be opened. A new type of G.655 fiber effective area extended to the general fiber of 1.5 to 2 times, large effective area to reduce the power density, reduce the fiber nonlinear effects.