A method of making a symmetrical-winding coil of optical fiber comprising the following steps: a. symmetrically winding an optical fiber around an axis , the winding starting from a point of the optical fiber located at equal distance from the two ends of the optical fiber, the winding forming a pattern comprising a same number N of layers of each half of the optical fiber, where N is a natural integer, a layer comprising a set of turns of optical fibers and spaces located between adjacent turns, the turns of a layer coming from a same half of the optical fiber and being placed at a same distance from the coil axis , and said winding forming a coil having a sectored arrangement comprising, on the one hand, a regular stacking area in which the turns of optical fiber of a layer are juxtaposed to the turns of the adjacent layer(s), so as to form at least one continuous sealing surface between two layers of adjacent turns, said at least one sealing surface preventing the passage of air and/or of glue between an external surface of the regular stacking area and at least one space located between the turns of the coil in the regular stacking area , and, on the other hand, an overlap area in which portions of optical fiber linking different turns of a same layer and/or different layers of the winding cross each other, the overlap area comprising at least one continuous path of communication between an external surface of the coil in the overlap area and said spaces located between adjacent turns of the regular stacking area ; b. making a glue infiltrate into the sectored-arrangement coil through an external surface of the overlap area so that the glue infiltrates through at least one continuous path of communication into the spaces located between adjacent turns in the regular stacking area , up to said at least one sealing surface . a. symmetrically winding an optical fiber around an axis , the winding starting from a point of the optical fiber located at equal distance from the two ends of the optical fiber, the winding forming a pattern comprising a same number N of layers of each half of the optical fiber, where N is a natural integer, a layer comprising a set of turns of optical fibers and spaces located between adjacent turns, the turns of a layer coming from a same half of the optical fiber and being placed at a same distance from the coil axis , and said winding forming a coil having a sectored arrangement comprising, on the one hand, a regular stacking area in which the turns of optical fiber of a layer are juxtaposed to the turns of the adjacent layer(s), so as to form at least one continuous sealing surface between two layers of adjacent turns, said at least one sealing surface preventing the passage of air and/or of glue between an external surface of the regular stacking area and at least one space located between the turns of the coil in the regular stacking area , and, on the other hand, an overlap area in which portions of optical fiber linking different turns of a same layer and/or different layers of the winding cross each other, the overlap area comprising at least one continuous path of communication between an external surface of the coil in the overlap area and said spaces located between adjacent turns of the regular stacking area ; b. making a glue infiltrate into the sectored-arrangement coil through an external surface of the overlap area so that the glue infiltrates through at least one continuous path of communication into the spaces located between adjacent turns in the regular stacking area , up to said at least one sealing surface . <EOS>