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Currently used for transmission network construction of the main fiber what? What are its main features?

Update:2017-12-04

There are three main types of G.652 conventional single-mode fiber, G.653 dispersion-shifted single mode fiber and G.655 non-zero dispersion shifted fiber.

The dispersion of G.652 single-mode fiber in the C band of 1530 ~ 1565nm and the L band of 1565 ~ 1625nm is large, generally 17 ~ 22psnm • km. When the system rate reaches 2.5Gbit / s or more, dispersion compensation is needed. At 10Gbit / s System dispersion compensation when the cost is larger, it is the most common transmission network in the laying of a fiber.
Dispersion of G.653 Dispersion Dispersion Fiber in C-band and L-band is generally -1 ~ 3.5psnm • km, it is zero dispersion at 1550nm, the system speed can reach 20Gbit / s and 40Gbit / s, it is the single wavelength long distance transmission Best fiber. However, due to its zero-dispersion characteristics, non-linear effects occur when using DWDM expansion, resulting in signal crosstalk that results in a four-wave mixing FWM, making DWDM unsuitable.
 
G.655 non-zero dispersion shifted fiber: G.655 non-zero dispersion shifted fiber in the C-band dispersion of 1 ~ 6psnm • km, in the L-band dispersion is generally 6 ~ 10psnm • km, dispersion is small, to avoid the zero Dispersion zone, both suppressed four-wave mixing FWM, DWDM capacity expansion can also be opened high-speed system. The new G.655 optical fiber can expand the effective area to 1.5 ~ 2 times of the general optical fiber. The large effective area can reduce the power density and reduce the nonlinear effect of the optical fiber.

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