Optical fiber technology

The laser physics group is a Working in close collaboration with the fiber group at RISE- ACREO. The head of their fiber optic research is Walter Margulis, who also is a guest professor in the group. The work concerns fiber lasers and amplifiers, nonlinear optics in fibers, multi-functional fibers for medical applications.

Multi-functional fibers

Multi-functional optical fibers are fibers fabricated by Acreo with integrated capillaries in various fashions. These capillaries can for example be filled with gases, liquids or metals. The metal filled fibers have for example been poled and used as active modulators, polarization controllers in all-fiber components and in nonlinear optics. Fibers integrated with fluids have been used as fluorescent light sources and in particle selection and sorting, and gas filled fibers are investigated as sensors and as a potential source for wide bandwidth light. Read more

Fiber Bragg gratings

Fiber Bragg gratings are key components for a vast number of applications in optical fiber lasers, optical sensors, optical communication systems and microwave photonic systems. We have developed a fiber Bragg grating writing system based on the multiple fringe printing technique. The system is highly controllable and flexible, allowing complex grating structures incorporating phase shifts, apodization and chirp.

Fiber lasers

We have studied and developed fiber lasers for almost twenty years. The work has been focused on rare-earth doped fibers (Yb, Nd, Er, and Tm). Present research topics involve volume Bragg grating and fiber Bragg grating controlled lasers and high power tunable lasers for nonlinear optical applications. Laser systems for atmospheric sensing We have also done work on mitigation of photodarkening, where we benefitted from the possibility to get fibers with desired parameters fabricated at the ACREO fiber lab in Hudiksvall.

Fiber components

Optical fiber with an electrode connected. The capillaries in the holey fibers can be filled with soft metals and thereby the fiber gets integrated electrodes. With these we fabricate poled fiber components that are used as in-fiber modulators and frequencies up to 300 MHz can be modulated using a voltage of only 30 V.By splicing the modulator to a conventional fiber these components can also be used for pulse picking, mode-locking and Q-switching of fiber lasers.