Beyond 1.6 Tb/s Net Rate PAM Signal Transmission for Rack-Rack Optical Interconnects with Mode and Wavelength Division Multiplexing

Dongdong Zou, Fan Li, Wei Wang, Zixuan Zhang, Jinkun Hu, Jianping Li, Qi Sui, Chao Lu, Zhaohui Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


In this article, a beyond 1.6 Tb/s net rate pulse amplitude modulation (PAM) communication system is experimentally demonstrated for 20 m rack-rack optical interconnects with low cost intensity modulation direct detection (IM-DD) architecture, which is enabled by mode division multiplexing (MDM) and wavelength division multiplexing (WDM). The MDM with three linearly polarized modes is realized by a multiplane light conversion (MPLC) mode multiplexer with the maximum modal crosstalk less than - 20 dB. The experimental results show that 2.01 Tb/s (1.84 Tb/s net rate) PAM-6 signal carried on three modes and four wavelengths is successfully transmitted over 20 m standard OM2 multimode fiber (MMF) with the BERs of received signals from all channels below hard decision forward error correction (HD-FEC) threshold of 3.8 × 10-3. Look-up table (LUT) pre-distortion and Volterra nonlinear equalizer (VNLE) are employed for nonlinear impairment mitigation to improve the system performance. Compared to linear feedforward equalizer (FFE), 0.3 dB and 1 dB receiver sensitivity improvements are obtained by LUT and VNLE, respectively. To the best of our knowledge, our proposed scheme achieves the highest bit rate of 167.5 Gb/s per wavelength in MDM system with IM-DD structure. The experimental results show that our proposed PAM MDM communication scheme is a promising candidate for future 1.6 Tb/s short reach rack-rack optical interconnects.

Original languageEnglish
Article number9217917
Pages (from-to)340-346
Number of pages7
JournalJournal of Lightwave Technology
Issue number2
Publication statusPublished - 15 Jan 2021


  • intensity modulation direct detection (IM-DD)
  • Mode division multiplexing (MDM)
  • multimode fiber (MMF)
  • optical fiber communication
  • pulse amplitude modulation (PAM)
  • rack-rack optical interconnects

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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