Abstract: An aircraft signal distribution system communicates electrical signals between a first station in an aircraft and a second station in the aircraft. The two stations are connected by at least partially redundant optical cables which can transmit signals between the two stations within two or three optical spectral windows. By wavelength division multiplexing (WDM), the signals to be communicated can be placed on independent, closely spaced spectral intervals within the spectral windows. The signals which are transmitted through the cables to a station are converted back to electrical signals for use by electrical devices at or near that station.