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    Wavelength selective optical devices using optical directional coupler
    2.
    发明授权
    Wavelength selective optical devices using optical directional coupler 失效
    使用光学定向耦合器的波长选择性光学器件

    公开(公告)号：US4900119A

    公开(公告)日：1990-02-13

    申请号：US176683

    申请日：1988-04-01

    申请人： Kenneth O. Hill ,  Derwyn C. Johnson ,  Francois Bilodeau ,  Sylvain Faucher

    发明人： Kenneth O. Hill ,  Derwyn C. Johnson ,  Francois Bilodeau ,  Sylvain Faucher

    IPC分类号： G02B6/12 ,  G02B6/34

    CPC分类号： G02B6/29332 ,  G02B2006/12164 ,  G02B6/2934 ,  G02B6/29353

    摘要： New types of narrowband wavelength selective optical devices are described. Various configurations are possible, according to the invention, that perform as narrowband wavelength selective transmission or reflection filters or as narrowband wavelength selective optical taps or combiners. The optical devices of the invention include a 3 dB optical directional coupler and wavelength selecting elements such as Bragg reflection gratings or Fabry-Perot resonators usually positioned in optical symmetry with respect to the directional coupler. Two or more wavelength selecting elements can be used to obtain desired filtering characteristics.

    摘要翻译： 描述了新型窄带波长选择光学器件。 根据本发明，根据本发明的各种配置可以作为窄带波长选择性透射或反射滤波器或者作为窄带波长选择性光学抽头或组合器来执行。 本发明的光学器件包括3dB光学定向耦合器和诸如布拉格反射光栅或法布里 - 珀罗谐振器的波长选择元件，通常相对于定向耦合器定位成光学对称。 可以使用两个或更多个波长选择元件来获得期望的滤波特性。

    Optical Fiber Fundamental Mode Field Expander
    5.
    发明申请
    Optical Fiber Fundamental Mode Field Expander 有权
    光纤基本型场扩展器

    公开(公告)号：US20090060417A1

    公开(公告)日：2009-03-05

    申请号：US12190861

    申请日：2008-08-13

    申请人： Francois Bilodeau ,  Bernard Malo ,  Stephen Mihailov

    发明人： Francois Bilodeau ,  Bernard Malo ,  Stephen Mihailov

    IPC分类号： G02B6/26 ,  G02B6/255

    CPC分类号： G02B6/14 ,  G02B6/2551 ,  G02B6/2552

    摘要： A device for providing an expanded mode field from a single mode optical waveguide is formed by fusing a length of single mode optical fiber with a length of fiber rod absent a cladding and adiabatically tapering the fused region. The length of single mode fiber has a core having a refractive index nco and a cladding having a refractive index ncl, wherein ncl

    摘要翻译： 通过将单模光纤的长度与没有包层的纤维棒的长度融合，并绝热地使熔融区域逐渐变细来形成用于从单模光波导提供扩展模场的装置。 单模光纤的长度具有折射率nco的核和具有折射率ncl的包层，其中ncl

    Method of Priming Filter for Molten Metal
    6.
    发明申请
    Method of Priming Filter for Molten Metal 有权
    熔融金属过滤器的方法

    公开(公告)号：US20080053275A1

    公开(公告)日：2008-03-06

    申请号：US10590472

    申请日：2005-02-23

    申请人： Luc Belley ,  Jean-Francois Bilodeau ,  Andre Gendron ,  Serge Munger

    发明人： Luc Belley ,  Jean-Francois Bilodeau ,  Andre Gendron ,  Serge Munger

    IPC分类号： C22B9/02 ,  C22B9/04

    CPC分类号： B22D43/004 ,  B22D11/119

    摘要： A method is described for priming an in-line molten metal filtration unit having a porous ceramic or refractory filter mounted substantially horizontally in a filter box. This filter box has an inlet for molten metal and an outlet for molten metal, the outlet being a closeable outlet in an exit well connecting to the downstream side of the filter. The method of the invention comprises the steps of adding a molten metal to the filter box sufficient to entirely cover the upstream side of the filter with a depth of molten metal and temporarily sealing the outlet in the exit well. A steadily increasing vacuum is then applied to the closed exit well at a rate between 0.1 and 10 kPa per second by withdrawing a stream of air from the exit well by means of a fan or air venturi until molten metal begins to flow through the filter At that point the vacuum is quickly released and the molten metal outlet is opened. Once the filter has been primed in this manner, flow of metal through the filter continues while requiring only a relatively low head of molten metal on the inlet side of the filter.

    摘要翻译： 描述了一种用于启动具有基本水平地安装在过滤箱中的多孔陶瓷或耐火过滤器的在线熔融金属过滤单元的方法。 该过滤箱具有用于熔融金属的入口和用于熔融金属的出口，该出口是连接到过滤器下游侧的出口孔中的可关闭的出口。 本发明的方法包括以下步骤：将熔融金属添加到过滤箱中，足以使熔融金属的深度完全覆盖过滤器的上游侧并临时将出口密封在出口孔中。 然后通过风扇或空气文氏管抽出出口孔中的空气流，以0.1至10kPa /秒的速率将稳定增加的真空施加到封闭的出口孔，直到熔融金属开始流过过滤器。 这样就可以快速地释放真空并且打开熔融金属出口。 一旦过滤器以这种方式被喷涂，金属通过过滤器的流动继续进行，同时仅需要在过滤器的入口侧上较低的熔融金属头。

    Modal-insensitive biconical taper couplers
    9.
    发明授权
    Modal-insensitive biconical taper couplers 失效
    模态不敏感双锥形锥形耦合器

    公开(公告)号：US4586784A

    公开(公告)日：1986-05-06

    申请号：US774851

    申请日：1985-09-09

    申请人： Yves Tremblay ,  Brian S. Kawasaki ,  Francois Bilodeau

    发明人： Yves Tremblay ,  Brian S. Kawasaki ,  Francois Bilodeau

    IPC分类号： G02B6/28

    CPC分类号： G02B6/2835 ,  G02B6/2856

    摘要： The modal-insensitive coupler consists of a number N of optical multimode fiber lengths, each fiber length having a core of initial predetermined cross-sectional area. The fiber lengths are fused together in a coupling section such that the cores of the fiber lengths have a reduced cross-sectional area in the coupling section which supports a minimum number of modes of optical energy at a predetermined wavelength, and such that the fiber lengths have different core cross-sectional areas to produce preselected coupling ratios.

    摘要翻译： 模式不敏感耦合器由多个N个光纤多模光纤长度组成，每个光纤长度具有初始预定横截面积的核心。 纤维长度在耦合部分中熔合在一起，使得纤维长度的芯在耦合部分中具有减小的横截面面积，其支持在预定波长处的最小数量的光能量，并且使得光纤长度 具有不同的芯横截面积以产生预选的耦合比。