High Speed 2-D Photodetector Array for Space and Mode-Division Multiplexing Fiber Communications

Toshimasa Umezawa*, Takahide Sakamoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


We report a high-data-rate two-dimensional photodetector array (2D-PDA) operated over 10 GHz for compact receiver systems in multicore fiber (MCF), few-mode fiber (FMF), and FMF-MCF, which can be directly coupled to multiparallel beams from the MCF and FMF. The 2D-PDA (pixel size of 20-30 μm, pixel number of 32) were designed and characterized for the frequency response and crosstalk. In the on-wafer probing test, the averaged 3-dB bandwidth of 11.2 GHz and 19.8 GHz were measured for 30-μm and 20-μm pixels, respectively. In the MCF direct-coupling demonstration with the 2D-PDA, the selected 16 pixels could work well at 25 Gb/s (nonreturn-to-zero: NRZ). By using triangular-shape-aligned seven-core fiber and the square-shape-aligned seven cores in the 2D-PDA, the coupling efficiency and alignment tolerance were investigated for the universal MCF photoreceiver. In the demonstration of the mode-division multiplexing signal detection with 2D-PDA, the multiplexed three-mode signal with 20-Gbps quadrature phase-shift keying was directly coupled to the 2D-PDA. Through the electrical phase matching system with the multiple-input multiple-output function, the three-mode signal (20 Gbps in each mode) could be successfully detected and separated error-free.

Original languageEnglish
Article number8385138
Pages (from-to)3684-3692
Number of pages9
JournalJournal of Lightwave Technology
Issue number17
Publication statusPublished - 2018 Sept 1


  • Crosstalk
  • direct coupling
  • few-mode fiber
  • high speed
  • multi-core fiber
  • two-dimensional photodetector array

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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