PURPOSE: To perform alignment more accurately than before and to perform practically optimum coupling with an optical fiber especially by imparting thrust under control, providing the controlled thrust with a first value during crossing direction adjustment, gradually reinforcing it to a second value larger than the first value and executing the fixation of a base after reinforcing the thrust.
CONSTITUTION: Two adjustment surfaces RL and RF are pressed to each other by the thrust F1 of the first value imparted through a compressed thrust spring 4, and at this time, the spring 4 is provided with a length L1 shorter than L0. A fiber conductor CF is moved accompanying slight friction in a longitudinal direction GL inside a groove VF by an appropriate means so as to achieve first maximum light coupling and the conductor CF is fixed to the base EF when the first maximum light coupling is achieved. New vertical direction GV adjustment and crossing direction GT adjustment are executed so as to achieve second maximum light coupling, and after the second maximum light coupling is achieved, the thrust is gradually increased and reaches the second value F2 and the spring 4 is provided with the length L2 shorter than the length L1 at this time. Thus, the inconvenient relative displacement of both bases is extremely little and the coupling loss can be less than 0.5dB.
BURUUNO SHIYUBE
EMANIYUERU GURAARU
| JPS63303688A | 1988-12-12 |