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High contrast ultrashort pulse written transmission filter based on Moiré fiber grating

: Krämer, R.G.; Fischer, B.; Matzdorf, C.; Goebel, T.A.; Richter, D.; Morandotti, R.; Nolte, S.


Herman, P.R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX : 1-4 February 2020, San Francisco, California, United States
Bellingham, WA: SPIE, 2020 (Proceedings of SPIE 11270)
ISBN: 978-1-5106-3303-2
ISBN: 978-1-5106-3304-9
Art. 112700V, 7 pp.
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <20, 2020, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()

We present narrowband and high contrast ultrashort pulse written phase shifted fiber Bragg gratings (FBG). The phase shift in the fiber was implemented by overlaying two spectrally slightly differing gratings, resulting in a Moiré grating. They were realized using the phase mask scanning technique, providing a reliable and reproducible inscription process. The different grating periods were implemented by controlling the applied strain on the fiber during inscription which was monitored spectrally. We present the results of single and multiple phase shift gratings with passband bandwidths as low as 4 pm and contrasts as high as 42 dB.