Fiber dispersion refers to a physical phenomenon (signal distortion) caused by the different frequency components and different mode components of the signal transmitted by the fiber, due to the different transmission speeds of different frequency components and different mode components.
Fiber dispersion refers to a physical phenomenon (signal distortion) caused by the different frequency components and different mode components of the signal transmitted by the fiber, due to the different transmission speeds of different frequency components and different mode components.
Since the refractive index of the fiber material is a nonlinear function of wavelength, the transmission speed of light changes with the change of wavelength, and the dispersion caused by this is called material dispersion. Material dispersion is mainly caused by the spectral width of the light source. Since the light source used in optical fiber communication is not monochromatic light, it has a certain spectral width, so that light waves of different wavelengths travel at different speeds, resulting in time delay differences and pulse broadening.
The dispersion causes the output optical signal pulse to be broadened to generate inter-symbol interference and increase the bit error rate, thus limiting the communication capacity and transmission distance.
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