The invention concerns an embedded optical ring communication network (10) suitable for transmitting data between equipment (12a-12h), characterised in that it comprises an assembly of distribution boxes (14a-14h) each connected to two other distribution boxes (14a-14h) by multimode bidirectional optical fibres (16a-16h) so as to form a ring, suitable for also being connected to a multiplexer/demultiplexer (18a, 18b, 18c) by multimode bidirectional optical fibres, and in that each optical fibre (16a-16h) is suitable for transporting optical signals of at least three different modes (32, 32, 34).