Large- and medium-sized enterprise data centers have been widely deploying 10G Ethernet over duplex multimode fiber for several years. When it comes time to transition to 40G or even 100G, a few challenges arise: Neither of these options is particularly attractive. Enterprises would like to upgrade their data centers without changing the duplex multimode fiber infrastructure model used in 10G Ethernet. That’s where short wavelength division multiplexing (SWDM) comes in.

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