Arrangement and method relating to optical transmission

摘要

An arrangement and a method route wavelength dependent optical signals including a number of wavelengths. The arrangement includes an optical Add-Drop multiplexing arrangement with input and output waveguides and a routing device with inputs and outputs. The routing device includes a splitting device with a number of inputs and a combining device with a number of outputs. One of the inputs and outputs, respectively, are used for a multi-wavelength input, whereas another input and another output, respectively, are used for an add/drop wavelength. The other inputs and outputs are used for looping back of the remaining wavelengths. Between the splitting and combining devices a number of branch waveguides are arranged, and both wavelength demultiplexing/multiplexing and switching are provided for by the routing device.