Cisco has achieved a remarkable transmission of 800Gbps across the Amitié transatlantic cable, which stretches over 6,234 kilometers from Boston, Massachusetts, to Bordeaux, France. This achievement marks a significant advancement in subsea network technology, driven by the burgeoning demand for enhanced cloud services and the rapid expansion of artificial intelligence (AI) capabilities.
The Amitié cable, distinguished by its use of Space Division Multiplexing (SDM) technology, incorporates 16 fiber pairs – surpassing the number found in traditional subsea cables. This technological innovation enables the sharing of repeater power across fiber pairs, optimizing the cable’s capacity to unprecedented levels.
During a real-time field trial that set new industry benchmarks, Cisco utilized Dense Wavelength Division Multiplexing (DWDM) to achieve 800G transmission within a 150GHz channel spacing. This operation showcased a spectrum efficiency of 5.33bit/s/Hz, peaking at a maximum spectral efficiency of 5.6bit/s/Hz.
Additionally, the trial achieved a 600G transmission over a remarkable distance of 12,469 kilometers using a trans-Atlantic loopback configuration. According to Cisco, this marks the first-ever demonstration of a 140Gbaud single carrier signal in a live environment and establishing a record for the longest distance achieved at single carrier 600G DWDM transmission on an SDM cable.
The Amitié cable system, vital for linking the United States, the United Kingdom, and France, is now part of Microsoft’s global network, intensifying the support for all Microsoft’s services. This convergence of Cisco and Microsoft indicates the crucial significance of reliable and speedy network connections in the era dominated by AI.
Bill Gartner, the Senior Vice President of Optical Systems and Optics at Cisco, emphasized the importance of the trial, denoting it as a turning point for SDM cables by manifesting their ability to significantly escalate the overall network capacity across such lengths.
Jamie Gaudette, The General Manager of Cloud Network Engineering at Microsoft, shared similar views, underlining the trial’s part in demonstrating what is presently a commercial technology for undersea routes. The successful transmission implies an advancement in network capacity and also holds the potential to induce digital transformation across numerous sectors worldwide.
The trial utilized Cisco’s NCS 1014 platform, equipped with Acacia’s Coherent Interconnect Module 8 (CIM 8), which includes the advanced Jannu digital signal processor and pioneering silicon photonics. Both of these products are available in the market and are being promptly deployed across various networks, beckoning a new period of undersea communication that meets the growing demand for superior performance and capacity in the digital field.
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