At the forefront of optical innovation, LEONI's subsidiary, j-fiber, stands out in the production of high-quality preforms, utilizing highly pure fused silica materials. These preforms form the cornerstone for crafting both high-performance special fibers and standard fibers, tailored meticulously to meet specific customer demands. Whether the application involves the transmission of high data rates or the efficient conveyance of high-power laser transmissions, j-fiber's expertise ensures that the necessary waveguide design is precisely adjusted to meet these needs, from the initial prototype phase to full-scale series production.

What sets j-fiber apart is its commitment to customization. The design and configuration of each preform are finely specified to achieve the desired numerical aperture. This involves careful determination of the core profile, whether step or graded index, and the selection of dopant options, including Germanium, Fluorine, Boron, or Rare-earth elements. Additionally, the geometry of the preform is crafted to suit application-specific requirements, with precise shaping of the core and cladding to facilitate optimal assembly.

LEONI's preforms are produced using state-of-the-art process technology, ensuring each step is aligned with the highest standards of quality. The production process begins with selecting the appropriate core material, sourced from undoped fused silica with varying OH content or achieved through direct coating of doped fused silica. The final waveguide preform is then crafted using the MCVD process for graded-index and step-index fibers or the PBVD process for large core step-index fibers. This meticulous attention to detail guarantees a preform with superior performance properties, crucial for the demanding applications they serve.

Quality is paramount at j-fiber, with every preform undergoing stringent quality monitoring to ensure compliance with specified parameters. The result is a preform that excels during the fiber drawing process, meeting the high-performance demands of various applications. Among the offerings are graded-index preforms for multimode fibers, available in the 50/125 and 62.5/125 designs, produced using the innovative MCVD technique. This ensures the fulfillment of all specified fiber performance properties, reinforcing LEONI's commitment to excellence in optical fiber production.