The JDSU WaveReady 100 GHz Optical Add/Drop Modules (OADM) comprise a family of flexible, low-cost solutions to enable capacity expansion of existing fiber. Through use of dense wavelength division multiplexing (DWDM) technology, a single optical fiber can carry up to 32 discrete optical channels. The 100 GHz DWDM OADM is configurable as both an OADM and a terminal multiplexer and demultiplexer (MUX/DEMUX) to support a broad range of architectures ranging from scalable point-to-point links to four-fiber protected rings. Innovative band upgrade ports allow for in-service pay-as-you-grow capacity scaling in multiples of one, four, or eight channels, allowing for lowest first-day cost without limiting growth. Market standard LGX packaging is readily deployed in existing LGX-compatible frames or can be adapted into the WaveReady line of shelves.