Ultra-Low Crosstalk Multi-Core Fiber with Standard 125-μm Cladding Diameter for 10,000km-Class Long-Haul Transmission

Yuto SAGAE  Takashi MATSUI  Taiji SAKAMOTO  Kazuhide NAKAJIMA  

IEICE TRANSACTIONS on Communications   Vol.E103-B   No.11   pp.1199-1205
Publication Date: 2020/11/01
Publicized: 2020/06/08
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019OBI0001
Type of Manuscript: INVITED PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
spatial division multiplexing,  multi-core fiber,  long-distance transmission,  micro-bending,  

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We propose an ultra-low inter-core crosstalk (XT) multi-core fiber (MCF) with standard 125-μm cladding. We show the fiber design and fabrication results of an MCF housing four cores with W-shaped index profile; it offers XT of less than -67dB/km over the whole C+L band. This enables us to realize 10,000-km transmission with negligible XT penalty. We also observe a low-loss of 0.17dB/km (average) at a wavelength of 1.55μm and other optical properties compatible with ITU-T G.654.B fiber. We also elucidate its good micro-bend resistance in terms of both the loss and XT to confirm its applicability to high-density optical fiber cables. Finally, we show that the fabricated MCF is feasible along with long-distance transmission by confirming that the XT noise performance corresponds to transmission distances of 10,000km or more.