Germanium dioxide serves as the primary dopant in optical fiber cores, where it modifies the silica glass matrix to raise the refractive index. With fiber production exceeding 600 million fiber-kilometers annually, germanium demand in this sector is expected to reach 80+ metric tons per year by 2026. For the fabrication of bend insensitive Fiber Bragg Grating (FBG) arrays, Fibercore offer three, high germania fibers: SM1500(4. The multimode (MM) fibers are available in Graded Index (GRIN) variants with 50μm and 62. A reconfigurable multiwavelength erbium-doped fiber laser based on an all-fiber multimode interferometer (MMI) is proposed and experimentally demonstrated.
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