The test utilized 8QAM modulation, achieving 4.5 bits per second per hertz on the Seabras-1 cable, owned and operated by Seaborn. This test was conducted on a submarine fiber optic cable spanning over 10,500 kilometers, enabling up to 50% greater capacity than systems lacking advanced coherent technologies such as Nyquist subcarriers and SD-FEC gain balancing. This test sets a new standard in optical performance by delivering the highest spectral efficiency in the industry for a commercially available product.
 
Infinera and Seaborn validated the performance of the Infinera XTS-3300 meshponder, which incorporates the Advanced Coherent Toolkit (ACT), on the Seabras-1 submarine cable, helping Seaborn maximize the return on its cable assets. Seabras-1 is one of the world's longest uncompensated submarine cables, directly connecting North and South America. Seaborn is the exclusive operator of the Seabras-1 route, which has been deployed with the XTS-3300.
 
The XTS-3300 is based on the Infinite Capacity Engine 4 (ICE4) and is optimized for long-range submarine applications. The groundbreaking performance of ICE4 technology incorporates exceptional technologies to increase installed capacity throughput, including digitally synthesized Nyquist subcarriers, enhanced pre- and post-dispersion compensation, tolerance to nonlinear phenomena, and SD-FEC gain balancing, which is only possible with dual-channel DSPs like those from Infinera. Together, these capabilities support up to 18.2 terabits per second per fiber for distances exceeding 10,000 km, driven by ICE4's established leadership in spectral efficiency.

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