Polarization-Multiplexed DMT with IM-DD Using 2 x 2 MIMO Processing Based on SOP Estimation and MPBI Elimination

Xian Zhou, Kangping Zhong, Jiahao Huo, Jinhui Yuan, Feng Li, Liang Wang, Keping Long, Pak Tao Lau, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)


A simple polarization-multiplexed (PM) discrete multitone (DMT) system with intensity modulation and direct detection (IM-DD) is proposed for short-reach optical communications. Only four photodetectors (PDs) are required at the receiver, and no extra 90° hybrid and balanced detection is necessary. Novel digital signal processing (DSP) algorithms are proposed for state-of-polarization (SOP) estimation and subsequent mixed polarization beat interference (MPBI) elimination. These enable polarization demultiplexing and channel estimation to be implemented by a simple 2 x 2 multiple-input and multiple-output (MIMO) frequency-domain equalizer. The feasibility of the proposed PM-DMT-DD system and the effectiveness of the novel DSP algorithms are investigated via theoretical and simulation studies.
Original languageEnglish
Article number7802812
JournalIEEE Photonics Journal
Issue number6
Publication statusPublished - 1 Dec 2015


  • discrete multi-tone
  • intensity modulation and direct-detection
  • polarization-multiplexing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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