| 摘要 |
PURPOSE:To minimize clad propagation mode component light and to maximize core propagation mode component light by measuring the clad leak light of an optical fiber and adjusting the relative position of an optical element and the optical fiber so as to minimize the leak light at the time of coupling and assembling said element and fiber. CONSTITUTION:The focus of the light radiated from the optical element 1 is aligned to the end face of the core 3a on the element 1 side side of the optical fiber 3 by adjusting the Z direction of an X-Y-Z stage 9. A photodetector B6 is then provided to the side face of the optical fiber 3 to detect the clad leak light radiated from the side face of the clad 3b of the optical fiber 3. The detected light is amplified by an amplifier 7 and the position in the X-Y directions of the element 1 is adjusted by the X-Y-Z stage 9 while said light is measured by an optical power meter B8. The element 1 is fixed to the position where the clad leak light is minimized. The clad propagation mode component light propagating in the clad 3b is minimized and the core propagation mode component light propagating in the core 3a is maximized if the device is assembled in such a manner. |
