Bright-dark soliton pairs generation in an erbium-doped fiber laser utilizing gamma alumina saturable absorber

We report the experimental observation of bright-dark soliton pairs in an erbium-doped fiber laser utilizing gamma aluminum oxide saturable absorber (γ-Al<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf>-SA) operating at 1.56 μm for the first time. The γ-Al<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf>-SA was fabricated using simple adhesion of material on ferrule tip using index-matching gel. Dual-wavelength and narrow linewidths in optical domain with alternate intensity spike and dip that repeats for every 9.0 MHz repetition frequency manifested the formation of bright-dark soliton pairs. These findings contribute to the future exploration of metal oxide as saturable absorbing material for various pulse dynamics and fundamental laser physics in the topic of ultrafast photonics.