In recent years, a new type of G.654E optical fiber has been used in some long-distance trunk lines and has achieved good results. So what is G.654E optical fiber? Will G.654E fiber replace traditional G.652D fiber?
In the mid-1980s, to meet the long-distance communication requirements of submarine optical cables, a pure silica core single-mode optical fiber with a wavelength of 1550 nm was developed. Its attenuation near this wavelength is 10% less than that ofOptical fiberG.652 is coming.
This type of fiber is defined as G.654 fiber, and its name at that time was “1550 nm wavelength minimum attenuation single-mode fiber.”
In the 1990s, WDM technology began to be used in underwater optical communications systems. WDM technology allows the simultaneous transmission of dozens or even hundreds of optical channels in an optical fiber, and with the use of fiber optic amplifiers, high-power multi-wavelength optical signals are coupled into an optical fiber and brought together. in a small interface. exhibit non-linear characteristics.
Due to the nonlinear effect of optical fiber, when the optical power entering the fiber exceeds a certain value, the transmission performance of the system will gradually decrease with the increase of the optical power entering the fiber.
The nonlinear effect of optical fiber is related to the optical power density of the fiber core. When the input optical power is constant, by increasing the effective area of the optical fiber and reducing the optical power density of the fiber core the fiber, the influence of nonlinear effect on transmission performance can be reduced. Therefore, G.654 optical fiber began to make a fuss about increasing the effective area.
The increase of the effective area of the fiber will lead to the increase of the cutoff wavelength, but the increase of the cutoff wavelength should be controlled so as not to affect the use of the fiber in the C band (1530nm~1565nm), Therefore, the cutoff wavelength of G.654 fiber is set to 1530nm.
In 2000, when the ITU revised the G.654 optical fiber standard, it changed the name to “cutoff wavelength-shifted single-mode optical fiber.”
Until now, G.654 optical fiber has two characteristics of low attenuation and large effective area. After that, the G.654 optical fiber used for submarine cable communication was mainly optimized around attenuation and effective area, and gradually developed into four subcategories of A/B/C/D.
Post time: Jan-10-2023
