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1. 发明申请

WO1994000782A1 PHOTOCOUPLER 审中-公开
公开(公告)号：WO1994000782A1
公开(公告)日：1994-01-06
申请号：PCT/JP1993000814
申请日：1993-06-16
申请人： FUJITSU LIMITED , FUKUSHIMA, Nobuhiro , NODA, Hideki , MATSUDA, Hiroaki
发明人： FUJITSU LIMITED
IPC分类号： G02B05/08
CPC分类号： G02B27/144 , G02B5/3041 , G02B6/2817 , G02B6/325 , G02B6/4208
摘要： A photocoupler used for splitting signal light in an optical transmission line at a predetermined ratio. A substrate is provided with a single-layer beam splitter formed by vacuum depositing a film material having a refractive index below a square root of the refractive index of the substrate so that an optical film thickness attains a predetermined value, and means for holding the single-layer beam splitter in the optical transmission line so that the angle of incidence is kept at about 45 . Alternatively, four-, five- or seven-layered thin film is formed by using three kinds of film materials having refractive indices of 1.46 +- 0.10, 1.65 +- 0.10 and 2.30 +- 0.10, respectively, on a substrate having a refractive index of 1.51 +- 0.10 or 3.50 +- 0.20, and the combination of the thin film layers and the optical film thickness of each thin film layer are selected so that dependence of a split ratio on polarized wave becomes small, and a branching film can be formed. The photocoupler further includes this beam splitter and means for holding the beam splitter in the optical transmission line at an angle of about 45 . Furthermore, the photocoupler may comprise a beam splitter formed by forming 4- to 14-layered thin film layer using two kinds of film materials having refractive indices of 1.46 +- 0.10 and 2.30 +- 0.10 on a substrate having a refractive index of 1.51 +- 0.10 to 3.50 +- 0.20 and selecting the combination of the thin film layers and the optical film thickness of each layer so that the dependence of the split ratio on polarized wave becomes small, and means for holding the beam splitter in the optical transmission line at an angle of about 45 .
摘要翻译：光电耦合器，用于以预定的比例将光传输线中的信号光分离。基板设置有通过真空沉积具有低于基板的折射率的平方根的折射率的膜材料形成的单层分束器，使得光学膜厚度达到预定值，以及用于保持单个光束传输线中的光束分束器，使得入射角保持在约45°。或者，通过在具有折射率的基板上分别使用折射率为1.46±0.10,1.65±0.10和2.30±0.10的三种薄膜材料形成四层，五层或七层薄膜为1.51±0.10或3.50±0.20，并且选择薄膜层和各薄膜层的光学膜厚度的组合，使得分流比对极化波的依赖性变小，分支膜可以是形成。光耦合器还包括该分束器和用于以大约45°的角度将分束器保持在光传输线中的装置。此外，光电耦合器可以包括通过使用折射率为1.46±0.10和2.30±0.10的两种薄膜材料在折射率为1.51±1的衬底上形成4-至14层薄膜层而形成的分束器， 0.10〜3.50±0.20，并且选择薄膜层的组合和各层的光学膜厚度，以使分流比对极化波的依赖性变小，以及用于将分束器保持在光传输线路以约45度的角度。

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