发明名称 Fiber optics transmission line
摘要 Even if a fiber fuse phenomenon occurs to start fire spreading, the fire spreading is shut off. A graded index fiber (GIF) 3 is inserted between transmission-use single mode fibers (SMF) 2 a, 2 b on a fiber optics transmission line 1 . The GIF 3 is so designed that its mode field diameter (MFD) gradually increases from a light entry side. The MFD exhibits a maximum value at a location ¼ of a pitch from the end of the GIF 3 . A GIF 3 a is disposed on the light entry side. A GIF 3 b having an MFD gradually decreasing is disposed on the opposite side of the GIF 3 a. The GIF 3 b is disposed on the light exit side. The lengths of the GIF 3 a and GIF 3 b are ¼ of a pitch. The length of the GIF 3 formed by connecting the both is ½ of a pitch. According to the present invention, an expanded MFD is inserted in the middle of the fiber optics transmission line, it is possible to shut off fire spreading caused due to fiber fuse phenomenon.
申请公布号 US2007031095(A1) 申请公布日期 2007.02.08
申请号 US20060568289 申请日期 2006.08.28
申请人 FUJITA JIN;MORISHITA YUICHI;MORITA KAZUAKI 发明人 FUJITA JIN;MORISHITA YUICHI;MORITA KAZUAKI
分类号 G02B6/028;G02B6/02;G02B6/036;G02B6/255;G02B6/26;G02B6/34 主分类号 G02B6/028
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