A sealed optical fiber connector, comprising: a connector housing having an interior cavity extending from a first end to a second end of the connector housing and a shell portion integrally formed at the first end of the connector housing; an optical connection portion mounted on a terminal end of an optical fiber cable and secured in the shell portion of the connector housing; and a cable sealing device; wherein the cable sealing device comprises: a cable defining axial and radial directions; a spreading member being a rigid washer and being arranged around the cable and axially movable relative to the cable, the rigid washer fitting loosely over an outer circumference of the cable, and having an external shape that closely fits the interior cavity of the connector housing; and an expandable elastic sleeve, concentrically disposed around the cable and over the spreading member, the expandable elastic sleeve including: first and second ends; a first cable sealing portion adjacent the first end of the elastic sleeve and in fixed sealing contact with the cable; a central sealing portion of the elastic sleeve axially offset from the first cable sealing portion and concentrically arranged around the spreading member; a first flexible membrane portion disposed between the first cable sealing portion and the central sealing portion; a second cable sealing portion adjacent to the second end of the elastic sleeve and in fixed sealing contact with the cable; and a second flexible membrane portion disposed between the second cable sealing portion and the central sealing portion; wherein the spreading member is maintained in a fixed position relative to a connector housing of the sealed optical fiber connector such that the central sealing portion is in sealing contact with the connector housing. a connector housing having an interior cavity extending from a first end to a second end of the connector housing and a shell portion integrally formed at the first end of the connector housing; an optical connection portion mounted on a terminal end of an optical fiber cable and secured in the shell portion of the connector housing; and a cable sealing device; wherein the cable sealing device comprises: a cable defining axial and radial directions; a spreading member being a rigid washer and being arranged around the cable and axially movable relative to the cable, the rigid washer fitting loosely over an outer circumference of the cable, and having an external shape that closely fits the interior cavity of the connector housing; and an expandable elastic sleeve, concentrically disposed around the cable and over the spreading member, the expandable elastic sleeve including: first and second ends; a first cable sealing portion adjacent the first end of the elastic sleeve and in fixed sealing contact with the cable; a central sealing portion of the elastic sleeve axially offset from the first cable sealing portion and concentrically arranged around the spreading member; a first flexible membrane portion disposed between the first cable sealing portion and the central sealing portion; a second cable sealing portion adjacent to the second end of the elastic sleeve and in fixed sealing contact with the cable; and a second flexible membrane portion disposed between the second cable sealing portion and the central sealing portion; wherein the spreading member is maintained in a fixed position relative to a connector housing of the sealed optical fiber connector such that the central sealing portion is in sealing contact with the connector housing. a cable defining axial and radial directions; a spreading member being a rigid washer and being arranged around the cable and axially movable relative to the cable, the rigid washer fitting loosely over an outer circumference of the cable, and having an external shape that closely fits the interior cavity of the connector housing; and an expandable elastic sleeve, concentrically disposed around the cable and over the spreading member, the expandable elastic sleeve including: first and second ends; a first cable sealing portion adjacent the first end of the elastic sleeve and in fixed sealing contact with the cable; a central sealing portion of the elastic sleeve axially offset from the first cable sealing portion and concentrically arranged around the spreading member; a first flexible membrane portion disposed between the first cable sealing portion and the central sealing portion; a second cable sealing portion adjacent to the second end of the elastic sleeve and in fixed sealing contact with the cable; and a second flexible membrane portion disposed between the second cable sealing portion and the central sealing portion; wherein the spreading member is maintained in a fixed position relative to a connector housing of the sealed optical fiber connector such that the central sealing portion is in sealing contact with the connector housing.