Optical router for distributing optical signals

An optical router for distributing optical signals, comprising at least three input/output ports, each designed to be optically connected to a transceiver that is configured to transmit and receive optical signals at a plurality of different wavelengths,

• each input/output port comprising an optical routing system connected to a plurality of optical paths internal to the optical router, each of the optical paths also being connected to another of the optical routing systems so as to optically connect the input/output port to each of the other input/output ports, the optical routing system being configured to passively direct an optical signal received by the input/output port into one of the optical paths chosen on the basis of the wavelength of said optical signal,
• the optical path via which an optical signal of a given wavelength is directed from a first input/output port to a second input/output port being the same optical path as that taken by an optical signal of the given wavelength from the second input/output port to the first input/output port.