title: Mode division multiplexing using an orbital angular momentum mode sorter and MIMO-DSP over a graded-index few-mode optical fibre.
abstract: Mode division multiplexing (MDM)- using a multimode optical fiber's N spatial modes as data channels to transmit N independent data streams - has received interest as it can potentially increase optical fiber data transmission capacity N-times with respect to single mode optical fibers. Two challenges of MDM are (1) designing mode (de)multiplexers with high mode selectivity (2) designing mode (de)multiplexers without cascaded beam splitting's 1/N insertion loss. One spatial mode basis that has received interest is that of orbital angular momentum (OAM) modes. In this paper, using a device referred to as an OAM mode sorter, we show that OAM modes can be (de)multiplexed over a multimode optical fiber with higher than -15 dB mode selectivity and without cascaded beam splitting's 1/N insertion loss. As a proof of concept, the OAM modes of the LP11 mode group (OAM-1,0 and OAM+1,0), each carrying 20-Gbit/s polarization division multiplexed and quadrature phase shift keyed data streams, are transmitted 5km over a graded-index, few-mode optical fibre. Channel crosstalk is mitigated using 4 × 4 multiple-input-multiple-output digital-signal-processing with <1.5 dB power penalties at a bit-error-rate of 2 × 10(-3).
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 USA.
authors.forename: Hao
authors.initials: H
authors.lastname: Huang
authors.affiliation: Institute for Ultrafast Spectroscopy and Lasers, CUNY City College, New York, NY 10031 USA.|Physics Department, CUNY City College, New York, NY 10031 USA.|Physics Department, CUNY Graduate Center, New York, NY 10016 USA.|New York State Center for Complex Light, New York, NY 10031 USA.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Milione
authors.affiliation: School of Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, UK.
authors.forename: Martin P J
authors.initials: MP
authors.lastname: Lavery
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 USA.
authors.forename: Guodong
authors.initials: G
authors.lastname: Xie
authors.affiliation: Institute for Ultrafast Spectroscopy and Lasers, CUNY City College, New York, NY 10031 USA.
authors.forename: Yongxiong
authors.initials: Y
authors.lastname: Ren
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 USA.
authors.forename: Yinwen
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 USA.
authors.forename: Nisar
authors.initials: N
authors.lastname: Ahmed
authors.affiliation: Institute for Ultrafast Spectroscopy and Lasers, CUNY City College, New York, NY 10031 USA.
authors.forename: Thien
authors.initials: T
authors.lastname: An Nguyen
authors.affiliation: New York State Center for Complex Light, New York, NY 10031 USA.|Corning Incorporated, Sullivan Park, Corning, 14831 NY USA.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Nolan
authors.affiliation: Corning Incorporated, Sullivan Park, Corning, 14831 NY USA.
authors.forename: Ming-Jun
authors.initials: MJ
authors.lastname: Li
authors.affiliation: School of Electrical Engineering, Tel-Aviv University, Tel-Aviv, ISRAEL 69978.
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
authors.affiliation: Institute for Ultrafast Spectroscopy and Lasers, CUNY City College, New York, NY 10031 USA.|Physics Department, CUNY City College, New York, NY 10031 USA.|Physics Department, CUNY Graduate Center, New York, NY 10016 USA.|New York State Center for Complex Light, New York, NY 10031 USA.
authors.forename: Robert R
authors.initials: RR
authors.lastname: Alfano
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089 USA.
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner