The efficient conversion of light from a multimode to a single mode optical fiber is an area of active research for applications such as telecommunications, astronomy, and high-power lasers. In this work, we demonstrate the ability to wavefront shape the input to a multimode fibre and achieve high efficiency coupling into a physically connected single mode fibre output. That is, without intermediate free space optics. The wavefront shaping creates a focused diffraction limited spot at the multimode fiber output, which is coupled to the core of the single mode fiber. Light that is not coupled to the single mode fiber core is coupled to the cladding and stripped. We have achieved up to 40% coupling with near diffraction limited output using phase only modulation.
|