title: 2 × 2 MIMO OFDM/OQAM radio signals over an elliptical core few-mode fiber.
abstract: We experimentally demonstrate a 4.46  Gb/s2×2 multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM)/OQAM radio signal over a 2 km elliptical core 3-mode fiber, together with 0.4 m wireless transmission. Meanwhile, to cope with differential channel delay (DCD) among involved MIMO channels, we propose a time-offset crosstalk cancellation algorithm to extend the DCD tolerance from 10 to 60 ns without using a circle prefix (CP), leading to an 18.7% improvement of spectral efficiency. For the purpose of comparison, we also examine the transmission performance of CP-OFDM signals with different lengths of CPs, under the same system configuration. The proposed algorithm is also effective for the DCD compensation of a radio signal over a 2 km 7-core fiber. These results not only demonstrate the feasibility of space division multiplexing for RoF application but also validate that the elliptical core few-mode fiber can provide the same independent channels as the multicore fiber.
authors.forename: Qi
authors.initials: Q
authors.lastname: Mo
authors.forename: Jiale
authors.initials: J
authors.lastname: He
authors.forename: Dawei
authors.initials: D
authors.lastname: Yu
authors.forename: Lei
authors.initials: L
authors.lastname: Deng
authors.forename: Songnian
authors.initials: S
authors.lastname: Fu
authors.forename: Ming
authors.initials: M
authors.lastname: Tang
authors.forename: Deming
authors.initials: D
authors.lastname: Liu