J-fiber Gmbh

S-fiber, Gmbh

Katrin Roessner

Lothar Brehm

Robert Hanf

Jurgen Rosenkranz

Wolfgang Haemmerle

Ralitsa Rosenow

Otto Bernauer

Armin Landers

A sensor fiber for the detection of changes of temperature, bending, and/or torsion includes a multicore optical waveguide with a fiber Bragg grating (FBG) structure. One embodiment contains at least two FBG cores and a surrounding cladding. The sensor fiber is characterized by one or more distinction and orientation means which produce a marker zone to assign and label each individual FBG core.

Sensor fiber having a multicore optical waveguide including fiber Bragg gratings

Methods for making active laser fibers include the production of an optical fiber with disturbed (or deviated) cylindrical symmetry on the glass surface of the fiber. The methods include a preform containing a central core made of glass. In one embodiment, the preform is circular and surrounded by additional glass rods and an outer glass jacket tube. In a first alternative embodiment, this preform is merged during fiber drawing. In a second alternative embodiment, the preform merged in a process forming a compact glass body with disturbed cylindrical symmetry. This compact preform is drawn into a fiber under conditions maintaining the disturbed cylindrical symmetry.

Methods for making active laser fibers

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Jena, Germany

Katrin Roessner