10 February 2011 Modal analysis of beams emerging from a multi-core fiber using computer-generated holograms
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Abstract
We investigate the beam emerging from a 3m-long passive large mode area multi-core fiber (MCF) at two different wavelengths to demonstrate the analysis of differently complex mode mixtures. Our method uses a computer-generated hologram (CGH) to modally decompose the beam exiting the fiber end facet. At 1064 nm the MCF is measured to be single-mode whereas at 633nm ten modes are guided. The excitation of distinct mode mixtures at 633nm is done by changing the input coupling situation enabled by a nano-positioning device. Furthermore it is demonstrated how bending of the fiber alters the modal spectrum.
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Christian Schulze, Christian Schulze, Oliver A. Schmidt, Oliver A. Schmidt, Daniel Flamm, Daniel Flamm, Michael Duparré, Michael Duparré, Siegmund Schröter, Siegmund Schröter, "Modal analysis of beams emerging from a multi-core fiber using computer-generated holograms", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142H (10 February 2011); doi: 10.1117/12.874732; https://doi.org/10.1117/12.874732
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