Specialty optical fiber with custom design. Available fiber coatings include polyimide, ormocer, silicone, high temperature acrylate coatings, hard clad silica, low index etc. Jacket materials such as nylon, ETFE . Thorlabs stocks the largest selection of single mode and multimode optical fibers in the photonics industry. com Europe FS EuropeFREE SHIPPING on Orders Over EUR 79 VAT excl. As a leading manufacturer, we at Matrix PT Tech Co. take pride in our high-quality products designed for various. MMC (Multimode Couplers) or fiber optic splitters, are Multimode FBT (Fused Biconical Splitter) Splitters with a defined split ratio from one input fiber to 2 output fibers.