Sumitomo cuts transmission loss in optical cables

Created July 31, 2023
Technologies and Products

Sumitomo Electric Industries, Ltd, says it has improved the transmission loss of terrestrial optical fibre cables using PureAdvanceTM-110, a pure-silica-core, low-loss, large effective-area (Aeff) fibre. These cables have been selected for a data centre interconnect (DCI) project, with delivery recently completed.

To achieve even lower transmission loss, Sumitomo Electric applied ultra-low-loss pure-silica-core fibre technologies. As a result, the transmission loss of optical fibre cables using PureAdvanceTM-110 has been improved from 0.17 dB/km to 0.16 dB/km or below. Sumitomo says that given a typical value at a wavelength of 1550 nm, this makes it the world’s lowest transmission loss for terrestrial cables.

The cables have been selected for a wide-area DCI project connecting data centre clusters in Tokyo, Kanagawa, and Chiba, and the delivery has been completed. The outstanding low-loss performance of these cables enables to construct extremely low-loss transmission links including a 157 km-long section with the total loss of as low as 36 dB after deployment (including splice and connector losses). This will allow for high-capacity data transmission between data centres and reduce the number of optical repeaters, realising reliable transmission links with reduced overall system costs.

Since 2017, Sumitomo Electric has been commercially supplying the low-loss, large Aeff pure-silica-core fibre PureAdvanceTM-110 and optical fibre cables using it for terrestrial trunk transmission lines. The fibre cables are compliant with Recommendation ITU-T G.654.E and are suitable for long-haul high-capacity optical signal transmissions.

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This article was written
by Peter Dykes

Peter Dykes is a independent telecoms and technology journalist who has over that last 30 years written for a wide range of B2B publications and companies. A former BT engineer, he specialises in networks and associated support systems. He is currently Editor of Optical Connections.