A device for fastening optical fibers for optical housing , the fastening device being configured to cooperate with at least one optical fiber equipped with a male plug , the optical housing having an opening defining an input-output direction , the fastening device comprising: - an optical connector comprising a first female plug and a second female plug , the first female plug being configured to receive at least one male plug of optical fiber inserted in a cooperation direction , - a fastening support configured to be arranged in the optical housing in a mounted position, the fastening support comprising two mounting zones , each being provided with a first receiving location configured to receive the optical connector according to a first configuration in which the first female plug faces the opening in the input-output direction and a second receiving location configured to receive the optical connector according to a second configuration, the second receiving location being offset relative to the first receiving location in the input-output direction , the cooperation direction being coincident with the input-output direction in the first configuration and in the second configuration, the fastening support extending along a base plane and the mounting zones having cooperation elements extending transversely to the base plane , the cooperation elements being configured to detachably hold the optical connector in the first configuration and in the second configuration, the two mounting zones being called the first mounting zone and the second mounting zone , the first mounting zone comprises first cooperation elements and the second mounting zone comprises second cooperation elements , the first cooperation elements and the second cooperation elements comprising at least one common element, each of the cooperation elements relating to a mounting zone comprising two rails parallel to the corresponding input-output direction , the first cooperation elements and the second cooperation elements comprising a common rail. - an optical connector comprising a first female plug and a second female plug , the first female plug being configured to receive at least one male plug of optical fiber inserted in a cooperation direction , - a fastening support configured to be arranged in the optical housing in a mounted position, the fastening support comprising two mounting zones , each being provided with a first receiving location configured to receive the optical connector according to a first configuration in which the first female plug faces the opening in the input-output direction and a second receiving location configured to receive the optical connector according to a second configuration, the second receiving location being offset relative to the first receiving location in the input-output direction , the cooperation direction being coincident with the input-output direction in the first configuration and in the second configuration, the fastening support extending along a base plane and the mounting zones having cooperation elements extending transversely to the base plane , the cooperation elements being configured to detachably hold the optical connector in the first configuration and in the second configuration, the two mounting zones being called the first mounting zone and the second mounting zone , the first mounting zone comprises first cooperation elements and the second mounting zone comprises second cooperation elements , the first cooperation elements and the second cooperation elements comprising at least one common element, each of the cooperation elements relating to a mounting zone comprising two rails parallel to the corresponding input-output direction , the first cooperation elements and the second cooperation elements comprising a common rail. <EOS>