Few-mode optical fiber for mode-division multiplexing

This paper describes the group delay difference and mode coupling of few-mode fiber for “uncoupled” mode division multiplexing. Optical mode separation is compatible with few-mode fiber. It has complementary characteristics with the MIMO technique.

► Evaluated group delay differences of few-mode fibers is few decades greater than PMD.
► Simple fiber coupler can extract one specific mode from few-mode fiber.
► Elliptical core few-mode fiber is compatible to optical mode coupler/splitter.