Dispersion compensation in optical communication network and optical communication network

A method for compensating signal dispersion with phase conjugating means in an optical communication network which comprises, in addition to the phase conjugating means, a plurality of telecommunications nodes and optical fibers connecting them, and in which communication network an optical signal comprising several optical signals having different wavelengths is transmitted on optical fiber,

• wherein in the communication network, the connections between the nodes are established via phase conjugating means in such a way that there is always at least one route between any two nodes in which the total number of phase conjugating means is even, and that the signal is routed from the transmitting node to the receiving node along a route in which the minimum even number of phase conjugating means is located, wherein
• at least two separate transmission links constituted by a first and a second optical fiber are used between two adjacent nodes to transport the signal between said nodes,
• one phase conjugating means is used on said first fiber and two phase conjugating means are used on said second fiber to compensate for the signal dispersion,
• the signal is routed from the transmitting terminal node to the receiving terminal node along an optical route in which the signal is subjected to phase conjugation observing the condition set on the total number of phase conjugating means, thus resulting in that the signal arrives at the receiving node substantially equivalent to what it was at the transmitting node.