Detailed explanation of the working principle of optical isolator
2021-10-18
Main application: unidirectional transmission, blocking back light, protecting lasers and fiber amplifiers Insertion loss: forward direction, ground insertion loss (0.2 to 2dB) High isolation: back loss. Single stage 20 to 40dB, 40 to 80dB bipolar Return loss: The return loss with connector is 60dB; Problems in the design of isolators: polarization sensitivity, wavelength dependence. The temperature dependence of the Faraday rotator.
[Introduction Principle]: Faraday effect: under the action of an external magnetic field, the polarization plane of the polarized light passing through it rotates. The material with this effect is a magneto-optical material. The rotation direction of the light polarization plane depends on the applied electric field and has nothing to do with the direction of light propagation. This effect is different from the inherent magneto-optical effect of light. In inherently light-sensitive materials, the direction of rotation depends on the direction of light propagation. It has nothing to do with the external magnetic field.
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