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    • 113. 发明申请
    • FIBEROPTIC COUPLING
    • WO1994023319A1
    • 1994-10-13
    • PCT/US1994003709
    • 1994-04-05
    • PORTA SYSTEMS CORPORATION
    • PORTA SYSTEMS CORPORATIONSTOWE, David, W.CRYAN, Colm, V.MAACK, Dave, R.
    • G02B06/26
    • G02B6/2856
    • Fused fiberoptic couplers of the type formed by the processes of providing the fibers, assembling them in a close-packed relationship, and heating and drawing the assembly of fibers in the close-packed region. The fiberoptic couplers (37) are fabricated from optical fibers that have optical cores (38, 46, 48, 50) and surrounding cladding and/or spacer fibers that have no core (40, 42, 44). The number of optical and spacer fibers and their relative arrangements are selected to achieve desired properties of the coupler (37). Its has been discovered that the steps involved in forming such a coupler, introduce slight size variation that can seriously affect the performance of the coupler, and that these slight variations can be accommodated by slight, controlled, under-sizing of one or more of the surrounding fibers or over-sizing of the central fiber. Other fiberoptic couplers, which may or may not be formed in the above manner, are described.
    • 通过提供纤维的方法形成的熔融光纤耦合器,以紧密组合的方式组装它们,以及加热和拉伸紧密堆积区域中的纤维的组装。 光纤耦合器(37)由具有光芯(38,46,48,50)以及没有芯(40,42,44)的周围包层和/或间隔纤维的光纤制成。 选择光学和间隔纤维的数量及其相对布置以实现耦合器(37)的期望特性。 已经发现,形成这种耦合器所涉及的步骤引入可能严重影响耦合器的性能的轻微的尺寸变化,并且这些微小的变化可以通过轻微的,受控的,小尺寸的一个或多个 周围的纤维或中心纤维的超尺寸。 将描述可以或可以不以上述方式形成的其它光纤耦合器。
    • 119. 发明申请
    • FIBER OPTIC POWER SPLITTER
    • 光纤分离器
    • WO1991019214A1
    • 1991-12-12
    • PCT/US1991003873
    • 1991-06-03
    • ASTER CORPORATIONSTOWE, David, W.CORKE, Michael
    • ASTER CORPORATION
    • G02B06/26
    • G02B6/2856
    • Fiber optic splitters having a central fiber (18, 21) and a selectable number of surrounding fibers (10, 20) with mutual contact among the surrounding fibers and central fiber, formed preferably of identical diameter starting fibers. According to a formula, between three and five surrounding fibers, the central fiber (18, 21) has a reduced diameter, while for seven or more surrounding fibers, the diameters of the surrounding fibers are reduced. Splitters with one input and four, eight, twelve, or sixteen equal outputs, having a flattened wavelength response are provided. Means are provided to reduce detrimental phase mismatch at the desired coupling ratio as by substantially matching the propagation constants of the central and surrounding fibers in the finished coupler. Provisions for sufficiently matching the propagation constants include making the fused splitter region short; starting with fibers having differing propagation constants selected so the difference is diminished during fusing; fusing the fibers together to the extent that there are substantially no interstitial voids in the coallesced fiber mass; and surrounding the surrounding fibers (10, 20) with a transparent substance having the effect of cladding. For the latter purpose, a tube (11) or transparent optical rods assembled about the surrounding optical fibers are fused therewith, or the transparent substance is a moldable substance applied after the fused region of the coupler has been formed.