An optical adaptor for mounting to a receptacle to optically couple connectorized optical cables, comprising: - an assembly of an optical interface to provide an optical path between a first and a second one of the connectorized optical cables to optically couple the first and the second connectorized optical cable , wherein the assembly of the optical interface has a first side (S110a) to optically couple the first connectorized optical cable to the optical path and a second side (S110b) to optically couple the second connectorized optical cable to the optical path, - a mounting element formed as a hollow body to mount the assembly of the optical interface , the mounting element having a longitudinal axis, - wherein the assembly of the optical interface is configured to be insertable in the hollow body of the mounting element , - wherein the assembly of the optical interface is configured such that the assembly of the optical interface is moveably arranged inside the hollow body of the mounting element in a direction along the longitudinal axis of the mounting element and is fixed inside the hollow body of the mounting element in relation to a rotation around the longitudinal axis of the mounting element , - wherein the mounting element is configured to mechanically couple the first connectorized optical cable to the mounting element so that the first connectorized optical cable is optically coupled to the optical path, - wherein the assembly of the optical interface comprises at least one ferrule to provide the optical path and a connector interface to receive the at least one ferrule , - wherein the assembly of the optical interface comprises a sleeve and a sleeve holder to hold the sleeve , - wherein the sleeve is configured to receive an end (E111) of the at least one ferrule and a ferrule of the first connectorized optical cable , - wherein the connector interface and the sleeve holder are mechanically coupled to each other. - an assembly of an optical interface to provide an optical path between a first and a second one of the connectorized optical cables to optically couple the first and the second connectorized optical cable , wherein the assembly of the optical interface has a first side (S110a) to optically couple the first connectorized optical cable to the optical path and a second side (S110b) to optically couple the second connectorized optical cable to the optical path, - a mounting element formed as a hollow body to mount the assembly of the optical interface , the mounting element having a longitudinal axis, - wherein the assembly of the optical interface is configured to be insertable in the hollow body of the mounting element , - wherein the assembly of the optical interface is configured such that the assembly of the optical interface is moveably arranged inside the hollow body of the mounting element in a direction along the longitudinal axis of the mounting element and is fixed inside the hollow body of the mounting element in relation to a rotation around the longitudinal axis of the mounting element , - wherein the mounting element is configured to mechanically couple the first connectorized optical cable to the mounting element so that the first connectorized optical cable is optically coupled to the optical path, - wherein the assembly of the optical interface comprises at least one ferrule to provide the optical path and a connector interface to receive the at least one ferrule , - wherein the assembly of the optical interface comprises a sleeve and a sleeve holder to hold the sleeve , - wherein the sleeve is configured to receive an end (E111) of the at least one ferrule and a ferrule of the first connectorized optical cable , - wherein the connector interface and the sleeve holder are mechanically coupled to each other. <EOS>