An optical fibre pay-off system (100, 160) comprising. a draw spool around which an optical fibre is wound and defining a longitudinal axis; a pay-off arm movable parallel to said longitudinal axis and engaged with a pay-off portion of the optical fibre; a controller configured to receive first and second position signals and cause said pay-off arm selectively moving in a first direction and in an opposite second direction; the system (100, 160) being characterized by further comprising: a first and second proximity sensors mounted on said pay-off arm; a tilting support rotatably mounted on said pay-off arm; an activation body fixed to said tilting support and extending between said first and second proximity sensors to be selectively detected by said sensors according to positions assumed by the tilting support; a first and a second contact elements fixed to said tilting support and defining an intermediate space in which the pay-off portion can move; wherein the tilting support is rotatable under a corresponding action of the pay-off portion on said first and second contact elements and configured to selectively assume: a first detection position in which the activation body is detected by the second proximity sensor which generates a position signal, and a second detection position in which the activation body is detected by the first proximity sensor which generates a further position signal. a draw spool around which an optical fibre is wound and defining a longitudinal axis; a pay-off arm movable parallel to said longitudinal axis and engaged with a pay-off portion of the optical fibre; a controller configured to receive first and second position signals and cause said pay-off arm selectively moving in a first direction and in an opposite second direction; the system (100, 160) being characterized by further comprising: a first and second proximity sensors mounted on said pay-off arm; a tilting support rotatably mounted on said pay-off arm; an activation body fixed to said tilting support and extending between said first and second proximity sensors to be selectively detected by said sensors according to positions assumed by the tilting support; a first and a second contact elements fixed to said tilting support and defining an intermediate space in which the pay-off portion can move; wherein the tilting support is rotatable under a corresponding action of the pay-off portion on said first and second contact elements and configured to selectively assume: a first detection position in which the activation body is detected by the second proximity sensor which generates a position signal, and a second detection position in which the activation body is detected by the first proximity sensor which generates a further position signal. a first and second proximity sensors mounted on said pay-off arm; a tilting support rotatably mounted on said pay-off arm; an activation body fixed to said tilting support and extending between said first and second proximity sensors to be selectively detected by said sensors according to positions assumed by the tilting support; a first and a second contact elements fixed to said tilting support and defining an intermediate space in which the pay-off portion can move; wherein the tilting support is rotatable under a corresponding action of the pay-off portion on said first and second contact elements and configured to selectively assume: a first detection position in which the activation body is detected by the second proximity sensor which generates a position signal, and a second detection position in which the activation body is detected by the first proximity sensor which generates a further position signal. a first detection position in which the activation body is detected by the second proximity sensor which generates a position signal, and a second detection position in which the activation body is detected by the first proximity sensor which generates a further position signal.