Fiber alignment device, ferrule device and method of manufacturing the ferrule device

A fiber alignment device for calibrating position accuracy of a fiber in a fiber bore of a ferrule assembly, the fiber bore being defined by an inner circumferential surface of a ferrule of the ferrule assembly, comprising:

• a fixation block;
• an alignment element having a first end portion fixed in the fixation block and a second end portion formed with a protrudent platform, an alignment groove being formed in the alignment element and extending to an end of the protrudent platform in a central axis of the alignment element;
• an alignment sleeve having a first end portion fitted on the second end portion of the alignment element and a second end portion opposite to the first end portion;
• and
• a spring element having a first end extending into the alignment sleeve and pressed against the alignment groove in the protrudent platform in a direction perpendicular to the central axis of the alignment element,
• wherein the fiber protrudes from the front end of the ferrule assembly, and the front end of the ferrule assembly is inserted into the alignment sleeve from the second end portion of the alignment sleeve until a predetermined length of the fiber protruding from the front end of the ferrule assembly enters into the alignment groove of the alignment element,
• wherein when the front end of the ferrule assembly is inserted into the alignment sleeve and when the fiber is inserted into the alignment groove of the alignment element, the position accuracy of the fiber in the fiber bore of the ferrule is calibrated to reach position accuracy of the fiber in the alignment groove of the alignment element, and
• wherein the first end of the spring element is configured to be pressed against a portion of the fiber inserted into the alignment groove and protruding beyond the front end of the ferrule assembly, so that an orientation of a center of the fiber with respect to a center of the fiber bore is adjusted to a predetermined eccentric orientation and held in the predetermined eccentric orientation and such that there is a gap between the fiber and the inner circumferential surface of the ferrule completely surrounding the fiber at the front end of the ferrule.