title: Long-haul quasi-single-mode transmissions using few-mode fiber in presence of multi-path interference.
abstract: We study long-haul Quasi-Single-mode (QSM) systems in which signals are transmitted in the fundamental modes of a few-mode fiber (FMF) while keeping other system components such as amplifiers and receivers are kept single-moded. The large-effective-area nature of the FMF fundamental modes improves system nonlinear tolerance in the expense of mode coupling along FMF transmissions which induces multi-path interference (MPI) and needs to be compensated. We analytically investigate 6-spatial-polarization mode QSM transmission systems in presence of MPI and show that in the weak coupling regime, the QSM channel is a Gaussian random process in frequency. MPI compensation filters are derived and performance penalties due to MPI and signal loss from higher-order modes are characterized. We also experimentally demonstrate 256 Gb/s polarization multiplexed (PM)-16-QAM QSM transmissions over a record distance of 2600 km with 100-km span using decision directed least mean square (DD-LMS) algorithm for MPI compensation.
authors.forename: Qi
authors.initials: Q
authors.lastname: Sui
authors.forename: HongYu
authors.initials: H
authors.lastname: Zhang
authors.forename: John D
authors.initials: JD
authors.lastname: Downie
authors.forename: William A
authors.initials: WA
authors.lastname: Wood
authors.forename: Jason
authors.initials: J
authors.lastname: Hurley
authors.forename: Snigdharaj
authors.initials: S
authors.lastname: Mishra
authors.forename: Alan Pak Tao
authors.initials: AP
authors.lastname: Lau
authors.forename: Chao
authors.initials: C
authors.lastname: Lu
authors.forename: Hwa-Yaw
authors.initials: HY
authors.lastname: Tam
authors.forename: P K A
authors.initials: PK
authors.lastname: Wai