Wavelength division multiplexing cassette for a fiber optic network and method of making same

A method of assembling a wavelength division multiplexing (WDM) cassette for a fiber optic network is disclosed and includes attaching a first plurality of wavelength filters to a first cassette workpiece, attaching a second plurality of wavelength filters to a second cassette workpiece, organizing the optical fibers extending from the wavelength filters, adjusting a length of the optical fibers extending from wavelength filters, and forming an optical connection between the optical fibers from the wavelength filters via a mass fusion splice. The first cassette workpiece and the second cassette workpiece are separate from each during at least one of the attaching, organizing, adjusting, and forming steps. The optical fibers may have predetermined lengths for being arranged in a helix configuration and folded to produce an organized fiber stack that fits within the confines of the cassette. A WDM cassette having an organized arrangement of optical fibers is also disclosed.