Visually adjusting coupling conditions in light-emitting micro-components

We demonstrate a directly visible approach to adjust the coupling conditions of photonic components based on fluorescent indication. Under an optical microscope, the fluorescence of the dye-doped polymer microfiber (PMF) is excited by the evanescent coupling method and is used to visualize the light path in the PMF. By simply moving the coupling position of input probe in a few microns according t...