EuroWire May 2019

Technical Article

Optical Attenuation vs Wavelength

During Laying After 5 days

At factory After Laying

Wavelength (nm) Optical Attenuation (dB/km)

▲ ▲ Figure 7 : Optical attenuation vs wavelength

1.55μm OTDR results (two-way method)

At factory During Laying

After Laying

After 5 days

Laying after 9 months

Optical Attenuation (dB/km@ 1.55μm)

effective area of 150μm 2 after actual laying operations. Optical attenuation at 1,550nm was 0.152dB/km, the same as the value confirmed on coiled cable at the factory. With all those data sets, it can be confirmed that optical attenuation was very stable throughout the time period from system assembly completion to field installation. Additionally, cable joints and couplings are sufficiently robust to withstand laying and handling without degrading the optical performance of the system. Finally, these results show that the cable design is capable of delivering all the properties of high-end optical fibres to realise high bit rate systems of 100Gb/s and higher. n 6 Acknowledgments The authors gratefully acknowledge the system owner, ship operator, landing staff for their cooperation during field measurements and colleagues for their contributions to this paper. ▲ ▲ Figure 8 : 1,550nmOTDR results (two-way method) [1] M Sakaguchi et al., “Development of Advanced Small Diameter Submarine Cable” SubOptic2010, EC16 (2010) [2] D Masuda et al., “Mass production results of submarine cable applying “Ultra Low Loss” and “Ultra Large Effective Area” Fibre”, IWCS2016, Section2-Paper3. [3] Y Tamura et al., “Lowest-Ever 0.1419-dB/km Loss Optical Fiber”, OFC 2017 paper Th5D.1 [4] V Kamalov et al., “Faster open submarine cable”, ECOC 2017, paper Th.2.E.5. Paper courtesy of proceedings at the 67 th IWCS Conference, Providence, Rhode Island, October 2018. 7 References

Submarine System Plant OCC Corporation 1-505-2, Hibiki-machi, Wakamatsu-ku, Kitakyushu, 808-0021 Japan Tel : +81 93 751 6500 Email : ohara@occip.com

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May 2019