An optical cable includes an optical module which includes first optical fibers and a first retaining element arranged about the first optical fibers. The module also includes second optical fibers arranged about the first retaining element, the second optical fibers being arranged on at least one circumference concentric with the first retaining element. The module also includes a second retaining element arranged about the second optical fibers, which is also substantially coaxial with the first retaining element. This optical module with coaxial retaining elements and fibers has a particularly high fiber density, while preserving the possibility to uniquely identify all the fibers.