| 摘要 |
To make a fused fiber coupler (1) which is especially suited as a pump coupler for use in fiber amplifiers, exhibits low sensitivity to polarization, and can be spliced in with low loss, commercially available single-mode fibers are employed. After completion of an elongating process and interruption of heat from a heat supply, the input-fiber pair (fiber ends 4, 5) and the output-fiber (fiber ends 6, 7) of two fused lengths of the fiber (2, 3) are twisted by 180 DEG about their common axis and fixed in this position.
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