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Working Group Passive Fiber Modules

Scientific Profile

Passive fiber-optic modules based on special optical fibers made of very different materials (silica glass, melted glass, crystals, …) and geometries are the key components of numerous photonic systems. For the production and qualification of the fiber-optic components of such modules, high-resolution optical structuring methods (interferometric and dot-pattern laser exposure and a focused ion beam system), specially adapted assembly and connection technology (polarization-maintaining splicers, taper drawing units, …), and several characterization methods (e.g., optical spectra analyzers from 300 nm to 2400 nm with corresponding light sources, a materials testing machine, climate chambers, …) are available.

The main focus of the research performed by this working group is on the preparation of components for tunable fiber lasers based on fiber Bragg grating (FBG) arrays, on the further development of fiber Bragg grating sensors for extreme application conditions (e.g., temperatures above 1000°C), on shape sensor technology, and on the investigation of novel structural designs (e.g., Fabry Perot structures in fiber tapers) for miniaturized fiber sensor components. Here, the aspects of stability (e.g., photodarkening) and suitability under special environmental conditions (e.g., high temperatures, applicability in biophotonics, and medical technology) are also of great importance.

Research Topics

  • Design and implementation of fiber-optic modules in special optical fibers (e.g., optical fiber gratings, optical fiber tapers)
  • Comprehensive characterization of fiber-optic modules (long-time spectral, thermal, and mechanical behavior)
  • Fundamental research on the long-term stability and temperature stability of fiber optic modules such as fiber Bragg gratings
  • Simulation of innovative effects in passive fiber-optic modules
  • Development of methods for the production and characterization of fiber-optic modules and fiber components


  • Novel techniques in the production of nanoscale index structures in large fiber cores for high-temperature sensor technology up to >2000°C, for high-power fiber lasers of >1 kW, and for biomedical applications
  • Implementation of novel laser systems (e.g., fs lasers with adjusted beam properties, UV lasers with high pulse energy levels) for the flexible adjustment of index modulations in optical fibers, in particular with large fiber cores
  • Research, simulation, implementation, and characterization of fiber Bragg gratings in the MIR spectral range in novel MIR fibers developed specifically for this purpose using novel techniques in the production of nano-index structures
  • Special optical fibers with increased back scattering based on UV-induced local nanostructures for OFDR sensor systems
  • Sensor systems based on fiber Bragg grating sensor elements for shape and bending sensor technology in multi-core fibers for biomedical applications based on draw tower gratings

Targeted Fields of Application

  • Biophotonics
  • Sensor technology
  • Laser technology/fiber-optic light sources
  • Information technology/telecommunications



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