title: All-fiber 6-mode multiplexers based on fiber mode selective couplers.
abstract: All-fiber 6-mode multiplexer composed of two consecutive LP11-mode selective couplers (MSC), two LP21-MSCs and an LP02-MSC is fully characterized by wavelength-swept interferometer technique. The MSCs are fabricated by polished-type fiber couplers coupling LP01mode of a single mode fiber into a higher-order mode of a few mode fiber. A pair of the mode multiplexers has minimum mode dependent loss of 4 dB and high mode group selectivity of over 15 dB. Mode division multiplexed transmission enabled by the all-fiber mode multiplexers is demonstrated over fiber spans of 117 km employing an in-line multi-mode optical amplifier. 6 modes of 120 Gb/s dual polarization quadrature phase shift keying signals combined with 30 wavelength channels are successfully transmitted.
authors.forename: Sun Hyok
authors.initials: SH
authors.lastname: Chang
authors.forename: Sang-Rok
authors.initials: SR
authors.lastname: Moon
authors.forename: Haoshuo
authors.initials: H
authors.lastname: Chen
authors.forename: Roland
authors.initials: R
authors.lastname: Ryf
authors.forename: Nicolas K
authors.initials: NK
authors.lastname: Fontaine
authors.forename: Kyung Jun
authors.initials: KJ
authors.lastname: Park
authors.forename: Kwangjoon
authors.initials: K
authors.lastname: Kim
authors.forename: Joon Ki
authors.initials: JK
authors.lastname: Lee