8 x 320-Gb/s Transmission over 5600 km Using All-ETDM 80-Gbaud Polarization Multiplexed QPSK Transmitter and Coherent Receiver

WDM transmission over 5600 km of ultra-large-area fiber is achieved using an 80Gbaud all-electronically multiplexed polarization-division multiplexed quadrature phase-shiftkeyed (PDM-QPSK) transmitter and off-line intradyne detection with four synchronized 120GSamples/s, 45-GHz inputs of an oscilloscope prototype. OCIS codes: 060.1660 Coherent communications, 060.2360 Fiber optics links and subsystems