The test, conducted across 2,200 kilometers of the Reach North Asia Loop (RNAL) Segment F, included PM-8QAM (Polarization Multiplexed 8 Quadrature Amplitude Modulation) and a wide range of advanced FlexCoherent™ modulation formats, along with transmitter- and receiver-based signal processing technologies. Segment F runs between Wada in Japan and Pusan ​​in South Korea.
              
PM-8QAM is a key technology for optimizing fiber capacity, thereby increasing the value of submarine cable systems deployed worldwide. PM-8QAM is designed to deliver a 50% increase in capacity compared to the most common coherent modulation technique, PM-QPSK, in a typical installation under the same conditions.
          
As part of a larger showcase of submarine super-channel capabilities between Telstra and Infinera, one of the world's first demonstrations of PM-3QAM modulation was also completed on a 4,250-kilometer link between California and Hawaii.

More information