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    Optical routing switch
    41.
    发明授权
    Optical routing switch 失效
    光路由开关

    公开(公告)号：US06275312B1

    公开(公告)日：2001-08-14

    申请号：US09416089

    申请日：1999-10-12

    Applicant: Michael J. Derks ,  Kuang-Yi Wu ,  Jian-Yu Liu

    Inventor： Michael J. Derks ,  Kuang-Yi Wu ,  Jian-Yu Liu

    IPC: H04J1406

    CPC classification number: G02F1/31 ,  G02B6/272 ,  G02B6/2766 ,  G02B6/2773 ,  H04Q11/0005 ,  H04Q2011/0024 ,  H04Q2011/0026 ,  H04Q2011/0035 ,  H04Q2011/0052

    Abstract: An optical routing switch employs a polarization-dependent routing (PDR) element formed by joining a plurality of prisms to form a substantially X-shaped interface between the prisms. A polarizing beam splitter (PBS) coating is applied to the interface, so that the interface transmits light having a first polarization along a transmitted optical path and reflects lights having a second, orthogonal polarization along a reflected optical path. A plurality of input/output ports are aligned to communicate optical signals along transmitted and reflected optical paths of the PDR element. Each input port has a birefringent element spatially separating the input optical signal into a pair of orthogonally-polarized beams, and a polarization rotator rotating the polarization of at least one of the pair of beams so that both beams have substantially the same polarization determined by the control state of the optical routing switch. Similarly, each output port has a polarization rotator that rotates the polarization of at least one of the pair of beams exiting the PDR element so that the beams have substantially orthogonal polarizations, and a birefringent element that combines the orthogonally-polarized beams into an output optical signal. Two PDR elements can be combined in an offset relationship to create a double ring add/drop switch or east/west protection switch.

    Abstract translation: 光路由交换机采用通过连接多个棱镜形成的偏振相关路由（PDR）元件，以在棱镜之间形成基本上X形的接口。 将偏振分束器（PBS）涂层施加到界面，使得界面沿着透射光路透射具有第一偏振的光，并沿着反射光路反射具有第二正交偏振的光。 对准多个输入/输出端口以沿着PDR元件的透射和反射光路传送光信号。 每个输入端口具有将输入光信号空间分离成一对正交偏振光束的双折射元件，以及旋转该对光束中的至少一个光束的偏振的偏振旋转器，使得两个光束具有基本上相同的偏振 光路由交换机的控制状态。 类似地，每个输出端口具有偏振旋转器，该偏振旋转器旋转离开PDR元件的一对光束中的至少一个的偏振，使得光束具有基本正交的偏振，以及将正交偏振光束组合成输出光学的双折射元件 信号。 两个PDR元件可以以偏移关系组合，以创建双环加/减开关或东/西保护开关。

    N x M optical wavelength routing switch
    43.
    发明授权
    N x M optical wavelength routing switch 失效
    N×M光波长路由交换机

    公开(公告)号：US6097518A

    公开(公告)日：2000-08-01

    申请号：US37937

    申请日：1998-03-10

    Applicant: Kuang-Yi Wu ,  Jian-Yu Liu

    Inventor： Kuang-Yi Wu ,  Jian-Yu Liu

    IPC: G02F1/313 ,  G02B6/34 ,  G02F1/31 ,  H04B10/02 ,  H04J14/00 ,  H04J14/02 ,  H04Q3/52 ,  H04Q11/00

    CPC classification number: G02B6/272 ,  G02B6/29302 ,  G02B6/29395 ,  G02F1/31 ,  H04Q11/0001 ,  H04Q11/0003 ,  H04Q11/0005 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219 ,  H04Q2011/0026 ,  H04Q2011/0032 ,  H04Q2011/0035

    Abstract: A switchable wavelength router switches wavelength division multiplexed (WDM) optical signals between N input ports and M output ports. Each WDM signal is spatially decomposed into N pairs of orthogonally polarized beams by a polarization-dependent routing element, such as a birefringent element. A polarization rotator array rotates the polarization of each beam pair so that both beams in each pair have the same polarization. A wavelength filter then demultiplexes each beam pair to create N sets of four beams, such that the first beam in each pair decomposes into third and fourth orthogonally-polarized beams, and the second beam in each pair decomposes into fifth and sixth orthogonally-polarized beams. The third and fifth beams carry a first spectral band at a first polarization, and the fourth and sixth beams carry a second complementary spectral band at an orthogonal polarization. A second polarization-dependent routing element spatially routes the four beams in each of the N sets based on their polarizations, and also spatially combines selected beam pairs from different sets to produce M pairs of beams. A second polarization rotator array restores each beam pair to orthogonal polarization, and a final polarization-dependent routing element recombines each beam pair to produce M output beams at the output ports.

    Abstract translation: 可切换波长路由器在N个输入端口和M个输出端口之间切换波分复用（WDM）光信号。 每个WDM信号通过偏振相关的路由元件（例如双折射元件）被空间分解为N对正交偏振光束。 偏振旋转器阵列旋转每个光束对的偏振，使得每对中的两个光束具有相同的偏振。 波长滤波器然后对每个波束对进行解复用以产生N组四个波束，使得每对波束中的第一波束分解成第三和第四正交偏振光束，并且每对波束中的第二波束分解成第五和第六正交偏振光束 。 第三和第五波束在第一极化处携带第一光谱带，并且第四和第六波束在正交极化处携带第二互补光谱带。 第二偏振相关路由元件基于它们的偏振空间地路由N组中的每一个中的四个波束，并且还将来自不同组的所选波束对空间组合以产生M对波束。 第二偏振旋转器阵列将每个波束对恢复为正交偏振，并且最终的偏振相关路由元件将每个波束对重新组合以在输出端口处产生M个输出波束。

    N+M digitally programmable optical routing switch
    44.
    发明授权
    N+M digitally programmable optical routing switch 失效

    公开(公告)号：US6049404A

    公开(公告)日：2000-04-11

    申请号：US63611

    申请日：1998-04-21

    Applicant: Kuang-Yi Wu ,  Jian-Yu Liu

    Inventor： Kuang-Yi Wu ,  Jian-Yu Liu

    IPC: G02F1/13 ,  G02B6/34 ,  G02F1/31 ,  H04B10/02 ,  H04B10/28 ,  H04Q11/00 ,  H04B10/00

    CPC classification number: G02B6/272 ,  G02B6/2766 ,  G02B6/2773 ,  G02F1/31 ,  H04Q11/0005 ,  H04Q2011/0024 ,  H04Q2011/0026 ,  H04Q2011/0035 ,  H04Q2011/0052

    Abstract: An optical routing switch provides polarization-independent and low-crosstalk switching between any of a plurality of input ports and any of a plurality of output ports over a wide operating range of temperatures and wavelengths. Optical signals appearing at each input port are spatially decomposed into two orthogonally-polarized beams by a first polarization-dependent routing element (e.g., a birefringent element or polarized beamsplitter). Beyond this point, a network of optical switches are placed along the optical paths of the pair of light beams. Each optical switch includes: (1) a polarization rotator that switchably controls the polarization of the input light beams so that both of the emergent beams are either vertically or horizontally polarized, according to the control state of the device; and (2) a polarization-dependent routing element that spatially routes the light beam pair to provide physical displacement based on their state of polarization. The final stage for each output port in the network consists of an array of polarization rotators that changes the polarization of at least one of the light beams, so that the two beams become orthogonally polarized. Finally, a polarization-dependent routing element (e.g., a birefringent element) intercepts the two orthogonally-polarized beams and recombines them to exit at the selected output port.

    Liquid crystal fiber waveguide
    46.
    发明授权
    Liquid crystal fiber waveguide 失效
    液晶光纤波导

    公开(公告)号：US5361320A

    公开(公告)日：1994-11-01

    申请号：US19856

    申请日：1993-02-19

    Applicant: Jian-Yu Liu ,  Kristina M. Johnson

    Inventor： Jian-Yu Liu ,  Kristina M. Johnson

    IPC: G02B6/032 ,  G02F1/1333 ,  G02F1/383 ,  G02B6/00

    CPC classification number: G02B6/032 ,  G02F1/1326 ,  G02F1/383

    Abstract: This invention provides a fiber waveguide with a liquid crystal core. The liquid crystals are aligned in layers with molecular directors approximately parallel to each other. An electric field can be applied to the liquid crystal core to provide linear and nonlinear optical modulation. Alone or in combination with polarizers, reflectors, and birefringent elements, the waveguide of this invention provides phase, polarization and intensity modulation, spectral filtering, and second harmonic generation.

    Abstract translation: 本发明提供一种具有液晶芯的光纤波导。 液晶以分子导向器大致彼此平行的方式排列。 可以将电场施加到液晶芯以提供线性和非线性光学调制。 本发明的波导单独或与偏振器，反射器和双折射元件组合，提供了相位，极化和强度调制，光谱滤波和二次谐波生成。

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