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Controlling the modal content coupled into an optical fiber can be desireablein many situations, e.g. for adjusting the sensitivity of the guided fielddistribution to external perturbations. For this purpose we used a monolithicsetup of a phase plate at a fiber inpute facet to excite selectivly higherorder modes, which theoretically can provide a mode purity of more than 99%. Weinvestigated the capabilities of this approach by complete modal decompositionof the fiber output signals, considering the achievable mode purity withrespect to several possible imperfections of the setup. The experiments arecompared with detailed numerical simulations and show a high agreement.Additionally a comparison with a well known setup with free space phase plateswas undertaken. This showed the monolithic setup to be energetically twice asefficient.

Selective higher order fiber mode excitation using a monolithic setup of a phase plate at a fiber facet