The process of preparing fluorine-doped multimode gradient optical fiber preform by MCVD is studied in this paper. Different core reactants are doped to form different core refractive index distributions. It is found that the core with more germanic chloride and phosphorus has better refractive index distribution. But it is not conducive to the radiation resistance of the fiber.
Polarization maintenance fiber with high birefringence is an important goal for the development of high power fiber lasers. There are different ways to achieve high birefringence, such as change shape of a fiber’s core and apply stress to a fiber’s core. In this paper, fibers with different ovality of elliptical core are fabricated and tested. On the other hand, stress type PM fibers are also made, including PANDA type fibers and bowtie type fibers. Their test results are compared and analyzed together with their structures. Generally, the bowtie type fibers has highest birefringence, while the PANDA fibers are with high birefringence and high production efficiency. Different application can choose different type of PM Laser fibers.
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