| 摘要 |
A method for fabricating optical fiber couplers comprising a first step in which when a plurality of optical fibers are fused and elongated till a desired splitting ratio is reached, a prescribed quantity of light is led into a first end of at least one optical fiber, a second step in which the light led is reflected at a second end of the optical fiber and returns to pass again through said coupler, the return light is detected at the first end of the optical fiber, and a third step for controlling the elongation of the coupler for stop on the basis of a ratio of the quantity of the detected light and the quantity of the incident light, wherein a reflection preventing device is provided on the distal end side of at least one of the plurality of optical fibers. The use of low coherency light, signal modulation techniques or reference measurements for the improvement of the signal to noise ratio is proposed. |
