| 摘要 |
An optical submarine branching unit for branching a trunk cable into first and second branch cables, including a pressure housing having a cylinder and first and second covers, a branching circuit unit accommodated in the pressure housing, a first feed through assembly mounted to the first cover so as to extend therethrough, for introducing optical fibers of the trunk cable into the pressure housing, and second and third feed through assemblies mounted to the second cover so as to extend therethrough, for introducing optical fibers of the first and second branch cables into the pressure housing, respectively. The branching circuit unit has a feeding unit and an optical circuit unit completely separated from the feeding unit. Each feed through assembly includes a sleeve and a pin inserted in the sleeve. The pin has a plurality of bosses each having a plurality of axial grooves. Multiple layers of optical fibers are received in each axial groove and extend along the pin.
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