Reconfigurable Spatial-Mode-Selective Frequency Conversion in a Three-Mode Fiber

We present a scheme for spatial-mode-selective frequency conversion in a few-mode fiber and experimentally demonstrate upconversion of arbitrary superpositions of LP
₀₁
and LP
_11a
signal modes from C-band to the fundamental mode in S-band with all conversion efficiencies within 1 dB range of one another.