Mode expansion theory and application in step-index multimode fibers for astronomical spectroscopy

@article{Hernandez2021ModeET,
  title={Mode expansion theory and application in step-index multimode fibers for astronomical spectroscopy},
  author={Eloy Hernandez and Martin M. Roth and Klaus Petermann and Andreas Kelz and Benito Moralejo and Kalaga Madhav},
  journal={Journal of The Optical Society of America B-optical Physics},
  year={2021}
}
In astronomical spectroscopy, optical fibres are abundantly used for multiplexing and decoupling the spectrograph from the telescope to provide stability in a controlled environment. However, fibres are less than perfect optical components and introduce complex effects that diminish the overall throughput, efficiency, and stability of the instrument. We present a novel numerical field propagation model that emulates the effects of modal noise, scrambling, and focal ratio degradation with a… 

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