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Tuning multichannel filters based on FBG in multicore fibers

: Göbel, T.A.; Weißflog, M.; Krämer, R.G.; Heck, M.; Richter, D.; Nolte, S.


Herman, P.R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIX : 2-5 February 2019, San Francisco, California, United States
Bellingham, WA: SPIE, 2019 (Proceedings of SPIE 10908)
ISBN: 978-1-5106-2459-7
ISBN: 978-1-5106-2458-0
Paper 109080O, 10 pp.
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <19, 2019, San Francisco/Calif.>
Industrial Laser, Laser Source and Laser Applications Conference (LASE) <2019, San Francisco/Calif.>
Photonics West Conference <2019, San Francisco/Calif.>
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
Deutsche Forschungsgemeinschaft DFG
GRK 2101
Conference Paper
Fraunhofer IOF ()

Multichannel filter elements based on fiber Bragg gratings in multicore fibers (MCF) feature excellent potential for applications in astrophotonics. However, due to slight core-to-core variations of the refractive index (RI), the resonance wavelength of the inscribed FBGs differs. For an optimized functionality, the filter properties, especially the resonance wavelengths, should be equal across all cores. Therefore, we present a post-treatment procedure by ultrashort pulsed laser irradiation in order to tune the resonance wavelength of an individual FBG. To shift the resonance wavelength, a constant RI change in addition to the RI modulation is induced. Precisely tuned wavelength shifts up to 255 pm are demonstrated. Finally, we demonstrate precise tuning of the FBG resonance wavelength in a single core inside an MCF.