Fiber Optics for Industry & Science: Cables, Assemblies & Sensors

Delivering light exactly where you need it. Bespoke fiber optic assemblies and bundles for demanding applications. Engineered in Germany.

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Custom-Tailored Fiber Optic Solutions

Welcome to your leading global provider of custom-tailored fiber optic solutions. As specialists in multimode fibers and advanced manufacturing technologies, we develop individual solutions based on your specific project requirements. Extensive industry knowledge of the fibers available on the market, paired with the maximum precision of mechanical components with eccentricity deviations of <15µm, forms the foundation of our expertise and quality. This allows us to guarantee reliable and highly efficient customer solutions in the fiber optics sector.

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Imagine plugging two optical fibers together like a plug into a socket. The “eccentricity” describes how precisely the fiber core sits in the center. If the center isn’t correct, light is lost, similar to a poorly fitting plug. With deviations of less than 15 micrometers (about one-fifth the width of a human hair!), FOS Inon ensures that virtually no light is lost at the connection points. This is crucial for precision applications such as medical lasers or spectroscopy.

What does eccentricity mean?

Why FOS Inon Fiber Optics?

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Global Partnership

By your side, worldwide. We are an internationally operating company with a global network of partners. No matter where you are located, we are there for you and will support you with your projects.

Custom-Tailored Solutions

Fiber optic cables individually tailored to your project. Our experts are happy to advise you and will work with you to develop the optimal solution for your project.

Highest Quality

We use state-of-the-art tools and technologies in the manufacturing of our fiber optic cables. Our products undergo strict quality controls to ensure they meet our high standards.

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Reliability

Solutions that deliver what they promise. Our fiber optic solutions are robust, durable, and reliable. You can count on our products to function flawlessly even under demanding conditions.

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Expertise

Benefit from our expert knowledge and our many years of experience in the fiber optics industry. Our team of experts is happy to advise you and will support you in the planning and implementation of your projects.

Our Fiber Optic Solutions

From custom fiber bundles to sub-15µm precision mechanical parts—we build the optical backbone for the world’s most demanding industries.

Hr. Kessler
Founder: Georg Kessler

About FOS Inon Fiber Optics

FOS Inon Optics is a medium-sized, owner-managed manufacturer of fiber optic cables from Germany, based in Niederschelden-Siegen. FOS Inon Optics has always manufactured sophisticated, custom-specific fiber optic cables for sectors such as power plants, fiber-optic flame detection, spectroscopy and microscopy, quality control, UV curing, as well as for other lighting and laser applications.

The family-owned company successfully focuses on niche products in the laser and analytics industries. Its business success is based on investments in state-of-the-art equipment, experienced and highly qualified employees with excellent technical knowledge, and the “Made in Germany” quality standard. The history of this young company proves that traditional values and developments combined with modern technologies guarantee high-quality products.

With the help of high-end tools, we achieve top quality. Whether you need radiation-resistant optical fibers in special lengths or temperature-resistant variants, trust in our expertise and benefit from our highly developed system for maximum accuracy in your project.

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Application Examples of our High-Performance Fibers

FOS stands for uncompromising precision, long service life and reproducible quality, developed and manufactured in Germany for the highest demands.

Medical Technology & Aesthetic Medicine

Precision fiber bundles, fiber optic cables, and light sources for medical technology, diagnostics, and aesthetic applications.

Analytics and Spectroscopy

Fiber optic solutions for analytics and spectroscopy. Precision fiber bundles and optical assemblies for Raman, NIR and UV/VIS spectroscopy. Optimized for chemical and pharmaceutical analysis.

Industrial Applications and Process Monitoring (PAT)

Robust fiber optic systems for process analytics, inline measurements and industrial quality assurance. Chemically resistant, precise and durable.

Microscopy & Image Transmission

High-precision fiber bundles and optical systems for microscopy and imaging techniques with excellent image quality and transmission.

Defense, Aerospace & Security Technology

Fiber optic systems for defense, aerospace, and security technology. Robust, precise, and operational under extreme conditions.

Lighting & Light Sources

Light sources and optical coupling systems for precise light distribution, stable light output and long-lasting fiber optic lighting systems.

Lighting Technology

Customized fiber optic lighting systems for spas, architecture, shipbuilding, garden and urban design. Precise, durable and energy-efficient.

Sensor Technology

Optical sensors and fiber optic systems for industrial applications, fire detection, pyrometry and data transmission.

Borosilicate Fibers

Various fiber bundles based on borosilicate (boron glass). Excellent resistance for industry, medicine and lighting.

Silica Fibers

Various fiber bundles and cables made from silica. Maximum heat resistance for laser applications, industry and medicine due to very high silicon oxide content.

News & Announcements

FOS LED Projektor

Passive lighting reimagined: FOS INON LED projectors for professional lighting installations

Light without voltage at the exit point, without heat generation in the room, and with years of reliable operation. What sounds like science fiction is already a reality at FOS …

RFQ Generator Mockup

Tailor-made fiber optic solutions at the touch of a button: Our new RFQ configurator

Specifying custom fiber optic assemblies has never been more efficient. With our new guided RFQ (Request for Quotation) configurator, you can now submit your technical requirements to us precisely and …

FOS Inon Optics Launches FIO: The Spirit of Light

FOS Inon Optics GmbH, a leading German manufacturer of tailor-made fiber optic solutions for science and industry, is proud to introduce FIO-The Spirit of Light, a new brand character that …

FOS Inon fiber optics for precise data transmission and communication.

Reliability doesn’t happen by chance.
At FOS Inon Optics, quality is not just a promise—it is a standard that can be measured. Our development and manufacturing processes for fiber-optic systems are ISO 9001:2015 certified. This establishes the foundation for reliable performance, reproducible results, and trust wherever optical precision is critical.