Clamping device and method for measuring eccentricity of optical-electric coupling member

A method for measuring an eccentricity of an optical-electric coupling member, the optical-electric coupling member comprising a first surface and a second surface substantially perpendicular to the first surface, the optical-electric coupling member also comprising two positioning poles perpendicularly extending upward from the first surface, a plurality first coupling lenses forming on the first surface, and a plurality of second coupling lenses forming on the second surface, the method comprising:

• providing a clamping device, the clamping device comprising a first plate and a second plate, the first plate comprising an upper surface, a lower surface facing away from the upper surface and a first side surface, the upper surface substantially parallel with the lower surface, the first side surface perpendicularly connecting the upper surface and the lower surface, the first plate defining a receiving cavity at a joint of the upper surface and the first side surface, the second plate detachably connected to the first plate, the second plate comprising a top surface and a second side surface, the second side surface perpendicularly connecting to the top surface, the second plate defining a sloped surface extending from the top surface to the second side surface, the second plate further comprising a reflective layer arranged on the sloped surface;
• assembling the first plate with the second plate, with the reflective layer aligning with the receiving cavity;
• inserting the optical-electric coupling member into the receiving cavity, with the first surface of the optical-electric coupling member parallel with the upper surface of the first plate, the first coupling lenses exposed out of the receiving cavity, and the second coupling lenses aimed at the reflective layer;
• and
• measuring any eccentricity between the first coupling lenses and the second coupling lenses aimed at the reflective layer, based upon the two positioning poles as reference points at the same time.