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发明授权
CN106605160B 光耦合器、激光装置以及锥形光纤 有权

光耦合器、激光装置以及锥形光纤
摘要：
本发明提供光耦合器、激光装置以及锥形光纤。实现从锥形光纤射出的光的NA比以往小的光耦合器。锥形光纤(13)具有形成于折射率为ncore的纤芯的内部的、折射率大于ncore的高折射率区域(131)。各GI光纤(12)的射出端面(12b)与锥形光纤(13)的入射端面(13a)以GI光纤(12)的射出端面(12b)的至少一部分与高折射率区域(131)的截面重叠的方式接合。另外，相对折射率差(Δ)小于0.076％。
摘要（英）：

Provided is an optical coupler configured to cause an NA of light, which exits a taper fiber, to be smaller as compared with a conventional optical coupler. A taper fiber (13) has a high refractive index part (131) which is provided inside a core of the taper fiber (13) and which has a refractive index smaller than a refractive index n core of the core. An exit end surface (12b) of each GI fiber (12) is bonded to an entrance end surface (13a) of the taper fiber (13) so that at least a part of the exit end surface (12b) of the each GI fiber (12) overlaps with a cross section of the high refractive index part (131).

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