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Mode selective fiber Bragg gratings

 
: Thomas, J.U.; Voigtländer, C.; Nolte, S.; Tünnermann, A.; Jovanovic, N.; Marshall, G.D.; Withford, M.J.; Steel, M.

:

Heisterkamp, A.; Joseph Neev; Stefan Nolte; Rick P. Trebino ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in ultrafast optics: biomedical, scientific, and industrial applications X : 24 - 26 January 2010, San Francisco, California, United States; SPIE Photonics West
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7589)
ISBN: 978-0-8194-7985-3
Paper 75890J
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <10, 2010, San Francisco/Calif.>
Photonics West Conference <2010, San Franciso/Calif.>
Englisch
Konferenzbeitrag
Fraunhofer IOF ()
bragg gratings; optical fibre; optical pulse generation

Abstract
Focussing ultrashort laser pulses allows for inscribing fiber Bragg gratings (FBGs) directly into rare earth doped fiber cores - without prior photosensitivity treatment. High reflective FBGs can be written into active Large Mode Area (LMA) Fibers with 20 micron core diameter using a phase mask scanning technique. Here, we demonstrate fiber Bragg gratings (FBGs), which cover only a fraction of the core. With this additional degree of freedom it is possible to taylor the reflectivity of individual modes. We show for example how those FBGs can be used in few mode LMA fibers to suppress reflections into higher order modes.

: http://publica.fraunhofer.de/dokumente/N-139029.html