Faraday Rotator is an optical device based on the Faraday effect.The linearly polarized light input can be rotated to specified angles,and the direction is only related to the internal magnetic field.Optical Isolator is made of three parts, an input polarizer, a Faradayrotator, and an output polarizer. It is an optical component whichallows the transmission of light in only one direction. It is widelyused for amplified lasers, mode-locked lasers and optical testinstrumentation.