Mode division multiplexing using an orbital angular momentum mode sorter and MIMO-DSP over a graded-index few-mode optical fibre

Hao Huang, Giovanni Milione, Martin P.J. Lavery, Guodong Xie, Yongxiong Ren, Yinwen Cao, Nisar Ahmed, Thien An Nguyen, Daniel A. Nolan, Ming Jun Li, Moshe Tur, Robert R. Alfano, Alan E. Willner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 -15dB mode selectivity and without cascaded beam splitting's 1/N insertion loss. As a proof of concept, the OAM modes of the LP 11 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 <1.5dB power penalties at a bit-error-rate of 2× 10-3.

Original languageEnglish
Article number14931
JournalScientific Reports
Volume5
DOIs
StatePublished - 9 Oct 2015

Funding

FundersFunder number
Defense Advanced Research Projects Agency

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