Design of High-Density Cable Parameters for Controlling Spatial-Mode Dispersion of Randomly Coupled Multi-Core Fibers

Yusuke Yamada,Hisashi Izumita,Taiji Sakamoto,Saki Nozoe,Kazuhide Nakajima,Hiroaki Tanioka,Yuto Sagae,Yoko Yamashita,Masaki Wada

doi:10.1109/jlt.2020.3045761

Yusuke Yamada, Hisashi Izumita + Show 7 more

Open Access

https://doi.org/10.1109/jlt.2020.3045761

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Abstract

In this work, we propose design parameters for optimized high-density optical cables to control the spatial-mode dispersion (SMD) of randomly coupled multi-core fibers (MCF). The analytical results of our proposed cable demonstrated the controllability of the bending and twisting of the implemented optical fibers by means of tension that is applied for a bundled fiber while keeping the sufficient reliability. An optical characterization showed that appropriate cabling parameters resulted in SMD controllability and a 47% reduction of the SMD coefficient while avoiding undesired loss increase. C-L band transmission experiments using our optical cable showed no degradation of the Q-factor or mode-dependent loss (MDL). Our proposed cable design is beneficial for achieving an SMD-managed large-capacity and long-haul transmission link.

Highlights

MUTI-CORE fiber (MCF) is an ideal transmission medium for increasing the transmission capacity in a limited cabling space
The management of spatial-mode dispersion (SMD) is important with randomly coupled MCF since it is closely related to the multiple-input multipleoutput (MIMO) complexity and limitations in transmission distance
We investigated the controllability of SMD coefficients by designing appropriate optical cabling parameters

Summary

INTRODUCTION

MUTI-CORE fiber (MCF) is an ideal transmission medium for increasing the transmission capacity in a limited cabling space. Coupled MCF is designed so that signals transmitted through each core have negligible inter-core crosstalk. This requires a relatively larger core pitch. The management of spatial-mode dispersion (SMD) is important with randomly coupled MCF since it is closely related to the MIMO complexity and limitations in transmission distance. Methods of controlling the state of optical fibers in an optical cable have contributed to improving polarization-mode dispersion (PMD) [7, 8]. These methods depend on the shape of the cable elements, e.g., the buffer-tube or slotted-rod cables. We report the transmission characteristics of the proposed the designed cable

OPTICAL CABLE STRUCTURE MODEL AND CABLING PARAMETERS FOR CONTROLLING SMD

EXPERIMENTS AND DISCUSSION

Findings

CONCLUSION