Fujitsu Network Communications has integrated 40 Gbps transmission capabilities into its FLASHWAVE 7500 Reconfigurable Optical Add/Drop Multiplexer (ROADM), enabling 10-Gbps metro DWDM networks based on the platform to grow from 400 Gbps to 1.6 Tbps of total capacity.Fujitsu has developed an advanced modulation scheme and per-wavelength variable dispersion compensation (VDC) to support the 40 Gbps rate. Optical performance requirements such as optical signal-to-noise ratio (OSNR), chromatic dispersion, polarization mode dispersion (PMD), and spectral...