This paper describes the principle, device and experimental results of magneto-optics modulation applying Faraday effect.

By means of computer simulation, Lissajou figure of the rectangular wave magneto-optical modulation method was investigated, and the principle and precision of this method were studied.

Based on our and other's study on Faraday anomalous dispersion optical filter (FADOF), the principle, structure, property and various application of FADOF will be discussed in this paper.