The Arista Dense Wavelength-Division Multiplexing (DWDM) 100G QSFP pluggable module (Figure 1) offers cost effective solution for metro Data Center Interconnect (DCI) for up to 80km reach at 100 Gigabit/s speed. The DWDM QSFP utilizes IEEE CAUI-4 4x25G electrical interface and is compatible with standard 100G QSFP ports. On the Optical side, it combines two wavelengths into a duplex fiber with the center wavelength aligning with the ITU-T defined 100GHz grid. This enables the use of existing Optical line systems like Optical MUX/DMUX and amplifiers. The DWDM QSFP is available in 40 different channels on the 100GHz ITU-T grid to provide a maximum bandwidth of 4Tbps over a single pair of fiber.
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