The present invention relates to an optical fibers management system comprising: a supporting frame; a plurality of splice trays pivotably mounted on the supporting frame and rotatable around respective parallel pivot axes between a closed position and an open position; a locking device pivotably mounted on the supporting frame and rotatable around a locking device rotation axis parallel to the pivot axes of the plurality of splice trays between a locking position and a support position, wherein in the locking position the locking device keeps the plurality of trays in the closed position, and in the support position the locking device supports the plurality of splice trays in the open position.