Photonics Research, Volume. 13, Issue 10, 2813(2025)

Six-mode SDM transmission over 960 km with a reach extension of five times enabled by a 6M-EDFA

Tao Xu1、†, Yanze Wang1、†, Minghao Liu1, Wenhao Li2, Wei Li2, Cheng Du2, Yaping Liu1,4、*, Zhiqun Yang1,5、*, Zhanhua Huang1, and Lin Zhang1,3,6、*
Author Affiliations
  • 1State Key Laboratory of Precision Measuring Technology and Instruments, Key Laboratory of Opto-electronic Information Technology of Ministry of Education, Tianjin Key Laboratory of Integrated Opto-electronics Technologies and Devices, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
  • 2FiberHome Telecommunication Technologies Co., Ltd., Wuhan 430205, China
  • 3Peng Cheng Laboratory, Shenzhen 518038, China
  • 4e-mail: liuyp@tju.edu.cn
  • 5e-mail: yangzhiqun@tju.edu.cn
  • 6e-mail: lin_zhang@tju.edu.cn
  • show less
    Figures & Tables(13)
    MDM transmissions via in-line FM-EDFAs.
    Schematic and photo of (a) the dual-stage integrated 6M-EDFA, (b) 6M-ISO, and (c) 6M-PC.
    (a) Normalized erbium doping profile with tested results (circular markers) and the designed profile (dashed blue line); (b) modal gains of the 6M-EDF across the C-band.
    (a) Experimental setup for characterizing the proposed 6M-EDFA, (b) modal patterns of signals before and after amplification, and (c) crosstalk matrix of the 6M-EDFA.
    The modal gain and DMG as a function of (a) the length of the first-stage 6M-EDF without the second-stage 6M-EDF and (b) the length of the second-stage 6M-EDF with the first-stage 6M-EDF.
    (a) The modal gain, DMG, and (b) NF of the 6M-EDFA as a function of forward pump power of the first-stage amplifier.
    (a) The modal gain, DMG, and (b) NF of the 6M-EDFA as a function of backward pump power of the second-stage amplifier.
    (a) The modal gain, DMG, and (b) NF of the 6M-EDFA as a function of input signal power.
    (a) Modal gain, DMG, and (b) NF of the proposed 6M-EDFA as a function of wavelength.
    Experimental setup for the six-mode transmission using the proposed 6M-EDFA.
    (a) Impulse responses at 240 km, 600 km, and 960 km. (b) Required equalizer windows at different transmission distances.
    (a) Measured BERs of all 12 spatial channels as well as the averaged BER at different transmission distances. (b) Constellations of six channels after 960-km transmission.
    • Table 1. Insertion Losses of All Six-Mode Passive Components, in Unit of dB

      View table
      View in Article

      Table 1. Insertion Losses of All Six-Mode Passive Components, in Unit of dB

      ComponentLP01LP11aLP11bLP21aLP21bLP02
      6M-ISO10.150.420.450.860.831.09
      6M-ISO20.220.460.490.900.931.18
      6M-ISO30.280.500.520.930.961.25
      6M-PC10.320.570.531.021.051.20
      6M-PC20.300.600.551.051.101.28
    Tools

    Get Citation

    Copy Citation Text

    Tao Xu, Yanze Wang, Minghao Liu, Wenhao Li, Wei Li, Cheng Du, Yaping Liu, Zhiqun Yang, Zhanhua Huang, Lin Zhang, "Six-mode SDM transmission over 960 km with a reach extension of five times enabled by a 6M-EDFA," Photonics Res. 13, 2813 (2025)

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Apr. 10, 2025

    Accepted: Jul. 14, 2025

    Published Online: Sep. 22, 2025

    The Author Email: Yaping Liu (liuyp@tju.edu.cn), Zhiqun Yang (yangzhiqun@tju.edu.cn), Lin Zhang (lin_zhang@tju.edu.cn)

    DOI:10.1364/PRJ.564839

    CSTR:32188.14.PRJ.564839

    Topics