A base for an optical fibre organizer, which comprises: a first passage along one longitudinal edge portion for incoming fibres; a second pasage along an opposite longitudinal edge portion for outgoing fibres; a plurality of first fibre guides separated from one another along the length of the base and extending from the first passage across the base towards the second passage where fibres in said guides are directed away from the plane of the base; a plurality of second fibre guides separated from one another along the length of the base and extending from the second passage across the base towards the first passage where fibres in said guides are directed away from the plane of the base.