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35 条记录 (耗时 0.02 秒)

    Method of forming a dispersing grating in an optical fiber
    1.
    发明授权
    Method of forming a dispersing grating in an optical fiber 失效
    在光纤中形成分散光栅的方法

    公开(公告)号：US5655040A

    公开(公告)日：1997-08-05

    申请号：US572717

    申请日：1995-12-14

    申请人： Jose Chesnoy ,  Isabelle Riant ,  Pierre Sansonetti

    发明人： Jose Chesnoy ,  Isabelle Riant ,  Pierre Sansonetti

    IPC分类号： G03F7/20 ,  G02B6/34

    CPC分类号： G03F7/70283 ,  G02B6/02133 ,  G02B6/02138 ,  G02B6/02152 ,  G03F7/7035

    摘要： A laser source supplies a primary laser beam. A phase grating generates two secondary beams from the primary beam so as to form interference fringes that are inscribed in an optical fiber by photo-refraction. An optical system of variable focal length varies the gap between the interference fringes so as to vary the pitch of the Bragg grating discretely for successive segments of the optical fiber. Means displace the primary laser beam and the optical fiber relative to each other by successive segments of said fiber. These means are synchronized with the variation of the focal length of the optical system. Application to telecommunications.

    摘要翻译： 激光源提供主激光束。 相位光栅从主光束产生两个次光束，以便通过光折射形成内接在光纤中的干涉条纹。 可变焦距的光学系统改变干涉条纹之间的间隙，以便为光纤的连续段离散地改变布拉格光栅的间距。 意味着主激光束和光纤相对于所述光纤的连续部分彼此相对移位。 这些装置与光学系统的焦距的变化同步。 应用于电讯业。

    Method of and system for writing a bragg grating point by point by point in an optical fiber
    2.
    发明授权
    Method of and system for writing a bragg grating point by point by point in an optical fiber 失效
    在光纤中逐点写入布拉格光栅的方法和系统

    公开(公告)号：US5768454A

    公开(公告)日：1998-06-16

    申请号：US772514

    申请日：1996-12-24

    申请人： Jose Chesnoy ,  Pierre Sansonetti ,  Isabelle Riant

    发明人： Jose Chesnoy ,  Pierre Sansonetti ,  Isabelle Riant

    IPC分类号： G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B6/26 ,  G02B6/34 ,  G02B27/44

    CPC分类号： G02B6/02138

    摘要： A system for writing a Bragg grating point-by-point in an optical waveguide includes an illumination system for producing a primary beam. It further includes a diffraction grating to receive the primary beam and to produce a zero order secondary beam and two symmetrical secondary beams of higher order and a focusing optical device for focusing the secondary beams onto a writing area of the waveguide. The diffraction grating and the focusing optical device define an intensity function of writing in the area of the guide including a central peak and two secondary peaks spaced from the central peak by a distance equal to the pitch of the grating.

    摘要翻译： 在光波导中逐点写入布拉格光栅的系统包括用于产生主光束的照明系统。 它还包括一个衍射光栅，用于接收一次光束，并产生一个零级二次光束和两个高阶对称次级光束，以及一个聚焦光学器件，用于将二次光束聚焦在波导的写入区域上。 衍射光栅和聚焦光学器件限定了在引导区域中写入的强度函数，其包括中心峰值和与中心峰值间隔开距离等于光栅间距的两个次级峰值。

    Band-pass filter in an optical waveguide
    4.
    发明授权
    Band-pass filter in an optical waveguide 失效
    光波导中的带通滤波器

    公开(公告)号：US5887094A

    公开(公告)日：1999-03-23

    申请号：US921323

    申请日：1997-08-29

    申请人： Fatima Bakhti ,  Isabelle Riant ,  Pierre Sansonetti

    发明人： Fatima Bakhti ,  Isabelle Riant ,  Pierre Sansonetti

    IPC分类号： G02B6/122 ,  G02B6/02 ,  G02B6/12 ,  G02B6/14 ,  G02B6/34 ,  G02B6/26

    CPC分类号： G02B6/02095 ,  G02B6/12007 ,  G02B6/14 ,  G02B2006/12107 ,  G02B2006/12109 ,  G02B6/02085 ,  G02B6/29317 ,  G02B6/29389

    摘要： A band-pass filter written into an optical waveguide includes at least one Bragg grating creating coupling between two propagation modes. In one version the pitch of the grating is equal to the length of beating of these two modes, to create codirectional coupling for the LP01 and LP0i modes. In another version the grating couples the LP01 mode to any contradirectional radiation mode. The filter includes, at one point at least of the grating, an area in which one half-period of the grating is omitted to create a phase-shift of .pi. between the two coupled modes.

    摘要翻译： 写入光波导的带通滤波器包括至少一个布拉格光栅，其产生两个传播模式之间的耦合。 在一个版本中，光栅的间距等于这两种模式的跳动长度，以创建LP01和LP0i模式的编码耦合。 在另一个版本中，光栅将LP01模式耦合到任何对向辐射模式。 滤波器在至少光栅的一个点处包括省略光栅的一个半周期以在两个耦合模式之间产生pi的相移的区域。

    Photosensitive optical fiber for a bragg grating filter, a method of fabricating said fiber, and a chromatic dispersion and chromatic dispersion slope compensator including a fiber of this kind
    5.
    发明授权
    Photosensitive optical fiber for a bragg grating filter, a method of fabricating said fiber, and a chromatic dispersion and chromatic dispersion slope compensator including a fiber of this kind 有权
    用于布拉格光栅滤光器的光敏光纤，制造所述光纤的方法以及包括这种光纤的色散和色散斜率补偿器

    公开(公告)号：US06400868B1

    公开(公告)日：2002-06-04

    申请号：US09490672

    申请日：2000-01-24

    申请人： Isabelle Riant ,  Pierre Sansonetti

    发明人： Isabelle Riant ,  Pierre Sansonetti

    IPC分类号： G02B634

    CPC分类号： G02B6/02114 ,  G02B6/02085 ,  G02B6/02109

    摘要： The invention proposes a photosensitive optical fiber for inscribing a Bragg grating by UV illumination, in which the photosensitivity is very high either to reduce the exposure time or to increase the contrast of the optically induced refraction index variations, whilst retaining a reasonable exposure time. Thanks to this high contrast, the fiber of the invention, imprinted with a linear chirp, in addition to correcting chromatic dispersion, is also effective in correcting the chromatic dispersion slope of a fiber of ordinary contrast, imprinted with a quadratic chirp. In a preferred embodiment, the fiber of the invention is photosensitive in the cladding. In a particularly advantageous embodiment, a non-photosensitive dopant is added to the core of said fiber to reduce the refractive index in the core, reducing the birefringence of the fiber.

    摘要翻译： 本发明提出了一种用于通过UV照射印刷布拉格光栅的光敏光纤，其中光敏性非常高以减少曝光时间或增加光学感应折射率变化的对比度，同时保持合理的曝光时间。 由于这种高对比度，除了校正色散之外，印有线性啁啾的本发明的光纤在校正普通对比度的光纤的色散斜率也是有效的，用二次啁啾印记。 在优选实施例中，本发明的纤维在包层中是感光的。 在特别有利的实施例中，将非光敏掺杂剂添加到所述纤维的芯中以降低芯中的折射率，降低纤维的双折射。

    Fiber Bragg grating optical filter with a constant group-delay response in its working band
    6.
    发明授权
    Fiber Bragg grating optical filter with a constant group-delay response in its working band 有权
    光纤布拉格光栅滤波器在其工作频带中具有恒定的组延迟响应

    公开(公告)号：US06381069B1

    公开(公告)日：2002-04-30

    申请号：US09594846

    申请日：2000-06-15

    申请人： Isabelle Riant ,  Pierre Sansonetti

    发明人： Isabelle Riant ,  Pierre Sansonetti

    IPC分类号： G02B518

    CPC分类号： G02B6/2932 ,  G02B6/29394

    摘要： The invention relates to the field of optical fiber wavelength division multiplexed transmission, and more particularly to the field of narrow-band optical filters for dense multiplexing. The invention proposes a narrow-band optical filter with a group-delay response that is very flat in the working band, obtained by cascading two Bragg gratings having group delays that are linear as a function of wavelength in the working band, but with their gradients being of opposite signs. The present solution is easier and less costly to implement than the prior art solutions, and it should also offer higher performance.

    摘要翻译： 本发明涉及光纤波分复用传输领域，更具体地涉及用于密集复用的窄带光滤波器领域。 本发明提出了一种具有组延迟响应的窄带滤光器，其工作频带非常平坦，通过级联具有组合延迟的两个布拉格光栅获得，该布拉格光栅作为工作频带中的波长的函数是线性的，但是具有它们的梯度 是相反的迹象。 目前的解决方案比现有技术的解决方案更容易且成本更低，并且还应当提供更高的性能。

    Filter optical waveguide with inclination and linear chirp
    7.
    发明授权
    Filter optical waveguide with inclination and linear chirp 失效
    滤波器具有倾斜和线性啁啾的光波导

    公开(公告)号：US06321008B1

    公开(公告)日：2001-11-20

    申请号：US09489845

    申请日：2000-01-24

    申请人： Isabelle Riant ,  Pierre Sansonetti

    发明人： Isabelle Riant ,  Pierre Sansonetti

    IPC分类号： G02B634

    CPC分类号： G02B6/02085 ,  G02B6/0208 ,  G02B6/02119

    摘要： An angled Bragg grating optical waveguide section adjusts the spectral response of a transmission filter in an optical waveguide or in an optical fiber. To smooth the response of the filter, which is subject to modulation due to coupling to the various cladding modes, the pitch of the Bragg grating is caused to vary in a linear fashion along the length of the filter. To adapt the attenuation band to a required band, the cladding of the optical fiber is doped with a photosensitive material so that the grating is also formed in the cladding. The photosensitivity of the cladding is advantageously greater than that of the core, in a ratio in the order of 5:1.

    摘要翻译： 倾斜的布拉格光栅光波导部分调节光波导或光纤中的透射滤波器的光谱响应。 为了平滑由于耦合到各种包层模式而受到调制的滤波器的响应，布拉格光栅的间距沿着滤波器的长度以线性方式变化。 为了使衰减频带适应于所需频带，光纤的包层掺杂有感光材料，使得光栅也形成在包层中。 包层的光敏性有利地大于芯的光敏性，其比例为5:1。