FIBER MODE CONVERTER AND FIBER ISOLATOR WITH MODE CONVERSION FUNCTION

摘要

The present invention relates to a fiber mode converter and a fiber isolator with conversion function. The fiber isolator includes a fiber mode converter and an optical isolator core which are integrated together. The fiber mode converter includes an input fiber collimator and an output fiber collimator which are set relatively. The input fiber collimator includes an input collimation lens which is in butt joint with the input fiber, and the output fiber collimator includes an output collimation lens which is in butt joint with the output fiber. The input collimation lens and the output collimation lens are set opposite the optical isolator core, and the collimation beam diameter of the input collimation lens is equal to the collimation beam diameter of the output collimation lens. The input/output fiber collimators are made of fiber and collimation lens with different parameters. The modes of the input/output fiber are matched by matching design between the respective parameters. The input/output fibers are packed together with the optical isolator core, so as to reduce loss, volume and cost.