LIEKKI offers a complete line of passive fibers with a broad range of optical and geometric characteristics matching our active fibers. Geometeries and numerical apertures (NA) are optimized to ensure low splicing and coupling losses. Our passive fibers are used in the manufacturing of components such as combiners, end caps and isolators and they can also be used as relay or delivery fibers. Passive fiber : - Excellent beam quality and matching to large mode area (LMA) fibers - Designed to "fit-in" octagonal active fibers - Matching with industry standard active fiber geometries 125, 250, 400µm - Round cladding for easy cleaving, splicing and handling - Available with low and high index coating