The Finisar MUX/DEMUX-4-EX optibox module is a passive optical multiplexer/demultiplexer designed for metro access applications that represents the state of the art in fiber optics design. The MUX/DEMUX-4-EX optibox module multiplexes and demultiplexes four CWDM wavelength channels from a two-fiber circuit and passes the other channels. Finisar''s design allows the creation of cost-effective unidirectional network traffic rings or point-to-point links. Multiplexed wavelengths are interfaced to any of Finisar''s CWDM transceivers on the equipment side. A grid of eight CWDM wavelengths is available from Finisar. The Finisar MUX/DEMUX optibox module delivers dramatic cost savings to network equipment manufacturers, enabling them to develop metro access systems that are lower in cost, easier to provision and simpler to operate.