US 11,808,984 B2
Optical fiber fuse protection device, laser device, and method
Hiroyuki Taya, Chiba (JP)
Assigned to Fujikura Ltd., Tokyo (JP)
Appl. No. 17/621,389
Filed by FUJIKURA LTD., Tokyo (JP)
PCT Filed Mar. 24, 2020, PCT No. PCT/JP2020/012915
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2021/002068, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 2019-124564 (JP), filed on Jul. 3, 2019.
Prior Publication US 2022/0357511 A1, Nov. 10, 2022
Int. Cl. G02B 6/255 (2006.01); G02B 6/26 (2006.01); H01S 3/00 (2006.01); H01S 3/23 (2006.01); G02B 6/42 (2006.01); H01S 3/30 (2006.01)
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
OG exemplary drawing
 
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.