High-Capacity and Ultra-Long-Haul Transmission over Transoceanic Distances Using Coupled and Uncoupled 4-Core Fibers with Standard Cladding Diameter

High-capacity transmission experiments using coupled and uncoupled 4-core fibers with standard cladding diameter are discussed. 62.9 Tbit/s and 50.4 Tbit/s transmissions over 9,150 km have been achieved with uncoupled and coupled 4-core fibers, respectively. Real-time MIMO processing for coupled 4-core fiber transmission over 7,200km and FIFO less EDFAs for submarine cable systems are also discussed.