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    Grating-in-etalon polarization insensitive wavelength division multiplexing devices
    9.
    发明授权
    Grating-in-etalon polarization insensitive wavelength division multiplexing devices 失效
    光栅入光偏振不敏感波分复用器件

    公开(公告)号：US5970190A

    公开(公告)日：1999-10-19

    申请号：US982690

    申请日：1997-12-02

    申请人： Xiaoli Fu ,  JingMing Xu

    发明人： Xiaoli Fu ,  JingMing Xu

    IPC分类号： G02B6/34

    CPC分类号： G02B6/12007 ,  G02B6/29311 ,  G02B6/29329 ,  G02B6/2938 ,  G02B6/29395 ,  G02B6/29397

    摘要： A grating-in-etalon wavelength division multiplexing device is disclosed. In one aspect the device includes an etalon structure with a single volume (or Bragg) diffraction grating, multiple superimposed volume diffraction gratings or a binary volume supergrating is interposed between the reflective opposed faces of the etalon. The etalon includes a tilt mechanism for tilting one or both of the reflective faces at a preselected angle with respect to each other from the parallel. A multiple wavelength light beam is directed through the volume grating in different preselected directions so that light of wavelengths satisfying the Bragg condition on each traversal of the grating is diffracted in a direction different from the direction of the incident beam. The diffracted beam exits the etalon and is wavelength interrogated in a detector while the undiffracted wavelengths propagate through the grating to be reflected from the opposed mirror face back through the volume grating. On this traversal the diffracted light exits through the other side of the etalon and is wavelength interrogated in another wavelength sensitive light detector. In another aspect of the invention the WDM device is fabricated from an etalon waveguide with reflective opposed faces and having a Bragg grating (or multiple gratings) written into the waveguide between the reflective faces. Polarization insensitivity is achieved by writing in two sets of gratings, one set to diffract ordinary polarized light and the other to diffract extraordinary polarized light so that when polarization state of light changes, the diffraction efficiencies are relatively the same.

    摘要翻译： 公开了一种标准光阑波分复用器件。 在一个方面，该器件包括具有单体积（或布拉格）衍射光栅的标准具结构，多个叠加的体积衍射光栅或二元体积超级光栅插入在标准具的反射相对面之间。 标准具包括倾斜机构，用于相对于彼此以预定角度倾斜一个或两个反射面。 多波长光束以不同的预选方向被引导通过体积光栅，使得在光栅的每个遍历处满足布拉格条件的波长的光在与入射光束的方向不同的方向上被衍射。 衍射光束离开标准具并在检测器中进行波长询问，而未衍射的波长传播通过光栅，从相对的镜面反射回通过光栅。 在该遍历中，衍射光通过标准具的另一侧射出，并在另一波长敏感光检测器中进行波长询问。 在本发明的另一方面，WDM器件由具有反射相对面的标准具波导制造，并且在反射面之间具有写入波导的布拉格光栅（或多个光栅）。 通过写入两组光栅实现极化不敏感，一组衍射普通偏振光，另一组衍射非凡偏振光，使得当光的偏振态变化时，衍射效率相对相同。