An optimization procedure for spatial mode multiplexing from individual single-mode fibers into a three-mode fiber based on a spatial aperture sampling concept has been developed. By placing space-variant imaging elements between the single-mode and few-mode fibers, each beam aperture can be shaped for lower loss coupling and low mode-dependent losses. The optimization achieves a record theoretical 1.5 dB insertion loss, improving on the previous theoretical 2 dB record.
- Few mode fibers (FMFs)
- mode-division multiplexing (MDM)
- optical communication