In this project, we demonstrate the fabrication of short, yet adiabatic 2- and 3-mode selective optical lanterns using double-clad fibers as input, replacing the newly demonstrated graded index fiber. Using three types of fibers with slightly different numerical apertures, we obtained very short components while retaining full adiabaticity. The resulting photonic lanterns are short and less fragile than components made with the current fabrication process, and they feature both low excess loss and high mode selectivity.
We present here an all-fiber Few-Mode OCT system making use of a modally specific photonic lantern to simultaneously de-multiplex light exciting the first two propagation modes of a few-mode fiber. Each mode collects a distinct projection of the scattering phase function from light backscattered by the sample. This implementation is mechanically more robust, has an optimal interferometric contrast and is compatible with commercially available OCT systems. We present a proof-of-concept through the imaging of micro-beads generating varying contrast depending on their relative size. Such a system offers an additional means of intrinsic contrast for OCT.
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