For the dispersion-shifted fiber with zero dispersion at 1.55μm, four-wave mixing will occur, resulting in crosstalk between channels, which is not conducive to the problem of multi-channel WDM systems. If there is a small amount of dispersion, FWM interference will be reduced. In response to this feature, people have developed non-zero dispersion fiber (NZ-DSF). The non-zero dispersion fiber is essentially an improved dispersion-shifted fiber whose zero dispersion wavelength is not at 1.55 μm, but at 1.525 μm or 1.585 μm. Non-zero dispersion fiber reduces the dispersion effect and four-wave mixing effect, while standard fiber and dispersion-shifted fiber can only overcome one of these two defects, so non-zero dispersion fiber combines standard fiber and dispersion-shifted fiber. Good transmission characteristics can be used in new land networks and upgrade existing systems. It is especially suitable for transmission of high-density WDM systems, so non-zero dispersion fiber is the best for the new generation of optical fiber communication systems. Transmission medium.
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