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1. 发明申请

WO1989002608A1 FIBER OPTIC COUPLER 审中-公开
标题翻译：光纤耦合器
公开(公告)号：WO1989002608A1
公开(公告)日：1989-03-23
申请号：PCT/US1988003162
申请日：1988-09-14
申请人： ASTER CORPORATION
发明人： ASTER CORPORATION , XU, Jisen
IPC分类号： G02B06/26
CPC分类号： B29C66/69 , B29C65/68 , B29C66/1122 , B29C66/526 , B29C66/71 , B29D11/00673 , B29L2011/00 , G02B6/2821 , G02B6/2835 , G02B6/2856 , G02B2006/2865 , B29K2033/12 , B29K2033/08
摘要： A fiber optic coupler and method for forming such coupler is shown in which the substance of the fibers (12, 14) is preselected to have a heat fusing temperature in a range achievable by exterior heating of a shrink sleeve (18), and the fibers (12, 14) are heat fused-together along a limited length region within the shrunken sleeve (18) as a result of heat and inter-fiber pressure applied to the fibers (12, 14) by exterior heating of the shrink sleeve (18). In preferred embodiments, a filler rod (50) is disposed alongside the optical fibers (12, 14) and pressed thereagainst by the shrink sleeve (18), the exterior of the rod (50) preferably of fluorocarbon plastic, having an index of refraction lower than the index of refraction of the fibers (12, 14) in the fused region. The interior of the filler rod (50) preferably comprises an elongated heat transfer element (52, 56) having a heat transfer coefficient greatly exceeding the heat transfer coefficient of the fibers (12, 14). Where few fibers are involved, the fibers are twisted about themselves and the filler or heat transfer element is substantially straight. For larger numbers of fibers, such as more than four, the fibers are loosely introduced in substantially parallel condition to fill the sleeve and are fused together by heating of the sleeve. A plastic coupler is also featured in which the cladding layer (32) is completely absent in a fused region, and the cores (34) in that region are deformed and fused together in a core-mode coupling relationship as the result of application of inter-fiber pressure under fusing conditions, preferably heat fusing conditions. Preferably the clad layer (32) is removed by solvent and care is taken to ensure that the exposed portion of core (34) has effective cladding, e.g. by action of a sleeve (18), a filler rod (50) and air spaces. Other important features relating to ease of manufacture and improvements in performance of optic fiber couplers are disclosed.
摘要翻译：示出了用于形成这种耦合器的光纤耦合器和方法，其中纤维（12,14）的物质被预选为具有在通过收缩套筒（18）的外部加热可实现的范围内的热定影温度，并且纤维（12,14）由于通过收缩套筒（18）的外部加热施加到纤维（12,14）上的热和纤维间的压力而沿缩小的套筒（18）内的有限长度区域热熔合在一起）。在优选实施例中，填充杆（50）沿着光纤（12,14）并排设置，并被收缩套筒（18）挤压，棒（50）的外部优选为氟碳塑料，具有折射率低于熔融区域中的纤维（12,14）的折射率。填料杆（50）的内部优选地包括具有大大超过纤维（12,14）的传热系数的传热系数的细长传热元件（52,56）。在涉及很少的纤维的情况下，纤维在其周围扭曲，并且填料或传热元件基本上是直的。对于较大数量的纤维，例如多于4个，纤维松散地引入基本上平行的状态以填充套筒，并通过加热套筒而熔合在一起。还有一种塑料耦合器，其中在熔融区域中完全不存在包层（32），并且该区域中的芯（34）作为施加相互之间的核心模式耦合关系而变形并融合在一起 - 在熔化条件下的纤维压力，优选热熔条件。优选地，包覆层（32）通过溶剂去除，并且注意确保芯（34）的暴露部分具有有效的包层，例如，通过套筒（18），填充杆（50）和空气空间的作用。公开了与易于制造和改进光纤耦合器的性能相关的其它重要特征。

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