At the heart of LEONI Fiber Optics' innovation is the development and production of high-quality preforms, crafted using highly pure fused silica materials. These preforms serve as the fundamental building blocks for manufacturing high-performance special fibers and standard fibers. Our subsidiary, j-fiber, specializes in tailoring these preforms to meet specific customer requirements, ensuring they are ideally suited for applications ranging from high data rate transmission to high-power laser transmission. By adjusting the waveguide design from prototype to series production, we ensure that each preform meets the exacting standards necessary for optimal performance. **Customized 

 LEONI Fiber Optics excels in creating preforms with precise design and configuration. We meticulously specify the core profile, whether step-index or graded-index, and select the appropriate dopant options such as Germanium, Fluorine, Boron, or Rare-earth elements. This customization allows us to achieve the desired numerical aperture and provides the required geometry for the preform. The shape of the core and cladding is carefully determined to facilitate application-specific assembly, ensuring that every preform is perfectly suited to the needs of our clients.

Our production process is rooted in advanced technology and stringent quality control measures. Each preform is crafted using the most suitable technology, beginning with the selection of core material from our raw material production of undoped fused silica. We employ our proprietary MCVD process for inner coating, ideal for graded-index and step-index fibers, or the PBVD process for outer coating, perfect for large core step-index fibers. Every preform undergoes strict quality monitoring to ensure it meets the goal parameters, resulting in preforms that deliver exceptional performance during the fiber drawing process for even the most demanding applications.

 LEONI offers cutting-edge graded index preforms for high-performance multimode fibers, available in 50/125 and 62.5/125 designs. Our innovative MCVD production technique guarantees that each preform fulfills the specified fiber performance properties. For added convenience, graded index preforms can be delivered with a handle, facilitating secure positioning in the drawing tower. This attention to detail and commitment to quality make our multimode preforms the ideal choice for those seeking superior fiber optic solutions.