Study the effect of Gause-hasen displacement on dispersion

摘要

The transfer property of light in the fiber based on the total reflection on the interface between core and cladding of fiber. But at the interface of total reflection, incident light spot and reflect light spot are not the same, and there is a small lateral shift between them, this is Gause-hasen displacement. But in the traditional optical waveguide theory, the effect of Gause-hasen displacement on dispersion were totally neglected. Considering the effect of Gause-hasen displacement, the expression of the time delay is presented. The theoretical results show that time delay distortion is a cause of the optical pulse dispersion, and Gause-hasen displacement really cause the dispersion of optical pulse. In the past, scientists only consider the effect of model dispersion, waveguide dispersion, material dispersion and polarization mode dispersion. Now, we must consider the effect from Gause-hasen displacement while we study the dispersion. In other words, the traditional research on the optical waveguide theory ignore the effect of the Gause-hasen displacement, which must induce an error. So we must pay more attention to this important problem in the future when the light transmitting in a fiber is studied.