OPTICAL MULTIPLEXING/DEMULTIPLEXING DEVICE

摘要

An optical multiplexing/demultiplexing device has a plurality of optical por ts along a cascading optical path with wavelength-specific filters disposed at the port s. The filters are selected to form groups of at least two virtually identical filters. At leas t one "add" connection is provided for admitting a selected band into the optical path, the connection being disposed at a second or consecutive (third, fourth etc...) filter of t he same wavelength as the band being added. The device uses a single medium for processing opti cal signals, e.g. a single polygonal optical block or air.