fiber optic transmission network What are the main?

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


       G.652 single-mode fiber in the C-band 1530 ~ 1565nm and L-band 1565 ~ 1625nm dispersion larger, usually 17 ~ 22psnm • km, the system speeds of up to2.5Gbit / s or more, the need for dispersion compensation in 10Gbit / s dispersion compensation when the cost of a larger system, it is the most commontransmission network in the laying of a fiber.


       G.653 dispersion-shifted fiber in the C-band and L-band dispersion is generally -1 ~ 3.5psnm • km, zero dispersion at 1550nm, the system speeds up to20Gbit / s and 40Gbit / s, single-wavelength ultra-long haul transmission best fiber.However, because of its zero-dispersion characteristics, the use of DWDM in theexpansion, there will be non-linear effects, resulting in signal crosstalk, resulting infour-wave mixing FWM, therefore not suitable for DWDM.


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