CPC G02B 6/2558 (2013.01) [G02B 6/264 (2013.01); H01S 3/005 (2013.01); H01S 3/2383 (2013.01); G02B 6/2551 (2013.01); G02B 6/2553 (2013.01); G02B 6/4296 (2013.01); H01S 3/302 (2013.01)] | 15 Claims |
1. An optical fiber fuse protection device included in a laser device, the optical fiber fuse protection device comprising:
an upstream optical fiber including an upstream surplus-length section that is coiled and disposed on a main surface of a base of the laser device;
a downstream optical fiber including a downstream surplus-length section that is coiled and disposed on the main surface so as not to overlap the upstream surplus-length section in a plan view, wherein
the downstream optical fiber is fusion-spliced to the upstream optical fiber and is made of a single optical fiber or a plurality of optical fibers fusion-spliced to each other; and
a wall interposed between the upstream surplus-length section and the downstream surplus-length section and that suppresses leaping fire from the upstream surplus-length section to the downstream surplus-length section or from the downstream surplus-length section to the upstream surplus-length section.
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