Method and System for Cassette Based Wavelength Division Multiplexing

A method and system is provided for cassette based wavelength division multiplexing. Higher throughput per laser “colored” transceivers are disclosed that can be multiplexed at the patch panel where an implementation may comprise a dense WDM grid that enables parts to meet “PSM4” specs natively regardless of color. The server to Tier 1 switch may utilize short reach PSM4 interconnects, at distances typically less than 500 meters. The Tier 1 to Tier 2 switch may utilize higher density per fiber. The outbound facing interface of Tier 1 switch has colored PSM4 interfaces and may have tight wavelength separation to enable PSM4 interoperability. The shuffling/multiplexing of colored modules may be configured outside the switch, where the aggregating cassette may be part of the patch panel and comprise a top of rack media converter.