| 摘要 |
An optical attenuator includes a holding sleeve, a pair of ferrules insert ed into and fixed to the holding sleeve such that the ferrules oppose each othe r at base ends thereof at a predetermined distance between each base end, and an attenuating fiber inserted into and fixed to the pair of ferrules such that ends of the attenuating fiber are exposed. The optical attenuator is also provided with an opening in the holding sleeve so as to communicate with the outside. A fille r is supplied into the sleeve through the opening.
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