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    Optical communication system having a liquid crystal routing switch
    1.
    发明授权
    Optical communication system having a liquid crystal routing switch 失效
    具有液晶路由开关的光通信系统

    公开(公告)号：US06201593B1

    公开(公告)日：2001-03-13

    申请号：US09418220

    申请日：1999-10-14

    申请人： Charles Wong ,  Yen-Chen Chen ,  Kuang-Yi Wu ,  Jian-Yu Liu

    发明人： Charles Wong ,  Yen-Chen Chen ,  Kuang-Yi Wu ,  Jian-Yu Liu

    IPC分类号： C09K1902

    CPC分类号： G02F1/31 ,  G02F1/1396 ,  G02F2001/1398

    摘要： A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0° and 90°, and preferably between 50° and 80° is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios, such as greater than −25 dB. Preferably the liquid crystal entrance director differs from the polarization direction by a beta angle of about 15°.

    摘要翻译： 提供了扭转角在0°和90°之间，优选在50°和80°之间的扭曲向列型液晶型电光调制器。 调制器提供相对较快的切换时间，例如小于约50毫秒，并提供相对较大的消光比，例如大于-25dB。 优选地，液晶入射指示器与偏振方向不同约为15°的β角

    Acute twist nematic (ATN) liquid crystal device for optical communication applications
    3.
    发明授权
    Acute twist nematic (ATN) liquid crystal device for optical communication applications 失效
    用于光通信应用的急转向向（ATN）液晶装置

    公开(公告)号：US06353467B1

    公开(公告)日：2002-03-05

    申请号：US09417600

    申请日：1999-10-14

    申请人： Charles Wong ,  Yen-Chen Chen ,  Kuang-Yi Wu ,  Jian-Yu Liu

    发明人： Charles Wong ,  Yen-Chen Chen ,  Kuang-Yi Wu ,  Jian-Yu Liu

    IPC分类号： G09K1902

    CPC分类号： G02F1/31 ,  G02F1/1396 ,  G02F2001/1398

    摘要： A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0° and 90°, and preferably between 50° and 80° is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios, such as greater than −25 dB. Preferably the liquid crystal entrance director differs from the polarization direction by a beta angle of about 15°.

    摘要翻译： 提供了扭转角在0°和90°之间，优选在50°和80°之间的扭曲向列型液晶型电光调制器。 调制器提供相对较快的切换时间，例如小于约50毫秒，并提供相对较大的消光比，例如大于-25dB。 优选地，液晶入射指示器与偏振方向不同约为15°的β角

    Optical attenuator using polarization modulation and a feedback controller
    4.
    发明授权
    Optical attenuator using polarization modulation and a feedback controller 失效
    使用偏振调制的光衰减器和反馈控制器

    公开(公告)号：US5963291A

    公开(公告)日：1999-10-05

    申请号：US897353

    申请日：1997-07-21

    申请人： Kuang-Yi Wu ,  Jian-Yu Liu ,  Yen-Chen Chen

    发明人： Kuang-Yi Wu ,  Jian-Yu Liu ,  Yen-Chen Chen

    IPC分类号： G02F1/03 ,  G02F1/133 ,  G02F1/13363 ,  G02F1/1347 ,  G02F1/139 ,  G02F1/31 ,  G02F1/13 ,  G02B27/10

    CPC分类号： G02F1/31 ,  G02F1/0311 ,  G02F1/0322 ,  G02F1/13318 ,  G02F1/13363 ,  G02F1/13471 ,  G02F1/1393 ,  G02F2203/48

    摘要： An optical power regulator employs a variable optical attenuator having a first birefringent element that spatially separates the input optical beam into two orthogonally-polarized beams. Both beams pass through a polarization modulator (e.g., a liquid crystal material) that rotates their polarizations to an extent determined by the control voltage applied across the polarization modulator. A final birefringent element spatially separates both beams exiting the polarization modulator into two pairs of orthogonally-polarized beams (i.e., two horizontally-polarized and two vertically-polarized components). The thicknesses and optical properties of the birefringent elements are selected so that two of the four beams are combined by the final birefringent element to exit at the output port of the regulator, while the remaining two beams are blocked. As a result, the degree of attenuation is determined by the degree of polarization rotation by the polarization modulator, which in turn is a function of the control voltage applied to the polarization modulator. Preferably, the liquid crystal material used in the polarization modulator has a high optical birefringence and a low dielectric anisotropy, which results in a relatively shallow attenuation curve as a function of applied voltage. The intensity of the optical signal is measured by a photodetector and used by a controller to output the control voltage applied to the liquid crystal material to maintain a desired optical power level at the output port of the regulator.

    摘要翻译： 光功率调节器采用具有第一双折射元件的可变光衰减器，其将输入光束空间分离成两个正交偏振光束。 两个光束通过偏振调制器（例如，液晶材料），其将它们的极化旋转到由施加在偏振调制器上的控制电压确定的程度。 最终的双折射元件将离开偏振调制器的两个光束空间分离成两对正交偏振光束（即两个水平极化和两个垂直极化分量）。 选择双折射元件的厚度和光学性质，使得四个光束中的两个由最终双折射元件组合以在调节器的输出端口处离开，而剩余的两个光束被阻挡。 结果，衰减程度由偏振调制器的偏振旋转程度确定，偏振调制器又是施加到偏振调制器的控制电压的函数。 优选地，在偏振调制器中使用的液晶材料具有高的光学双折射和低介电各向异性，这导致作为施加电压的函数的相对浅的衰减曲线。 光信号的强度由光电检测器测量，并被控制器用来输出施加到液晶材料的控制电压，以便在调节器的输出端口处保持期望的光功率电平。

    Wide transmission optical comb filter with wide pass band and wide stop band
    5.
    发明授权
    Wide transmission optical comb filter with wide pass band and wide stop band 失效
    宽传输光梳滤波器，宽通带宽宽阻带

    公开(公告)号：US06426816B1

    公开(公告)日：2002-07-30

    申请号：US09614782

    申请日：2000-07-12

    申请人： Kuang-Yi Wu ,  Charles Wong ,  Jian-Yu Liu ,  Ye Li

    发明人： Kuang-Yi Wu ,  Charles Wong ,  Jian-Yu Liu ,  Ye Li

    IPC分类号： H04J1406

    CPC分类号： H04J14/02

    摘要： The inventive filter forms a four filtering stage device from two filtering stages and a reflective stage. This greatly reduces the noise level in a WDM signal, wherein the signal is one of the odd channels and the even channels, while the noise is present on the other of the odd channels and the even channels. The first stage separates the WDM signal and noise into their polarization components, rotates the components of one of the signal and the noise, and recombines the components of the signal, while blocking a portion of the noise. This output is passed to the second stage which repeats the operation of the first stage. The output of the second stage is then reflected by the reflecting stage back to the second stage, and subsequently the first stage, for processing in reverse order. The inventive filter, via the mirror in the reflecting stage, reduce dispersion of the light during processing.

    摘要翻译： 本发明的滤波器从两个滤波级和反射级形成四个滤波级装置。 这大大降低了WDM信号中的噪声电平，其中信号是奇数通道和偶数通道之一，而噪声存在于奇数通道和偶数通道中的另一个上。 第一级将WDM信号和噪声分离成它们的偏振分量，旋转信号和噪声之一的分量，并重新组合信号的分量，同时阻挡噪声的一部分。 该输出被传递到重复第一阶段的操作的第二阶段。 然后第二级的输出被反射级反射回到第二级，随后被反射到第一级，以相反的顺序进行处理。 本发明的滤光器通过反射级中的反射镜减少了处理过程中光的分散。

    Dynamic gain equalizer for optical amplifiers
    9.
    发明授权
    Dynamic gain equalizer for optical amplifiers 失效
    用于光放大器的动态增益均衡器

    公开(公告)号：US06429962B1

    公开(公告)日：2002-08-06

    申请号：US09730650

    申请日：2000-12-05

    申请人： Ming Xu ,  Tizhi Huang ,  Chongchang Mao ,  Jian-Yu Liu ,  Kuang-Yi Wu ,  Charles Wong

    发明人： Ming Xu ,  Tizhi Huang ,  Chongchang Mao ,  Jian-Yu Liu ,  Kuang-Yi Wu ,  Charles Wong

    IPC分类号： H04B1012

    CPC分类号： H04B10/2941 ,  G02F1/0136 ,  G02F1/13471 ,  G02F2203/05 ,  G02F2203/48 ,  H01S3/06754 ,  H01S3/10023 ,  H01S2301/04

    摘要： An optical equalizer for use primarily with an erbium-doped fiber amplifier has an initial polarizer that convert the input beam to a predetermined polarization, followed by a series of dynamically-adjustable sinusoidal filters that provide attenuation as a sinusoidal function of beam wavelength. Each of the sinusoidal filters has a first liquid crystal cell adjustably rotating the polarization of the beam from the preceding polarizer. This is followed by a second optical element that retards the beam as a sinusoidal function of beam wavelength. For example, the second optical element can be a birefringent crystal that provided a fixed degree of retardance to the beam and a second liquid crystal cell that provides a variable degree of retardance, thereby allowing adjustment of the center frequency of the sinusoidal function. Finally, a third liquid crystal cell adjustably rotates the polarization of the beam. A final polarizer provides amplitude control of the beam based on the polarization rotations introduced by the first and third liquid crystal cells. A controller provides control signals to the liquid crystal cells of each sinusoidal filter so that their combined sinusoidal attenuation functions produce a desired equalization curve.

    摘要翻译： 主要用于掺铒光纤放大器的光学均衡器具有将输入光束转换为预定偏振的初始偏振器，随后是一系列动态可调的正弦滤波器，其提供作为波束波长的正弦函数的衰减。 每个正弦滤波器具有第一液晶单元，其可调节地使来自前一偏振器的光束的偏振旋转。 其后是第二光学元件，其将光束延迟为波束波长的正弦函数。 例如，第二光学元件可以是对光束提供固定的延迟度的双折射晶体和提供可变延迟的第二液晶单元，从而允许调整正弦函数的中心频率。 最后，第三液晶单元可调整地使光束的偏振旋转。 最终的偏振器基于由第一和第三液晶单元引入的偏振旋转来提供光束的幅度控制。 控制器向每个正弦滤波器的液晶单元提供控制信号，使得其组合的正弦衰减函数产生期望的均衡曲线。

    Dispersion compensation for optical systems
    10.
    发明授权
    Dispersion compensation for optical systems 失效
    光学系统的色散补偿

    公开(公告)号：US06396609B1

    公开(公告)日：2002-05-28

    申请号：US09469336

    申请日：1999-12-20

    申请人： Chi-Hao Cheng ,  Jian-Yu Liu ,  Kuang-Yi Wu ,  Charles Wong

    发明人： Chi-Hao Cheng ,  Jian-Yu Liu ,  Kuang-Yi Wu ,  Charles Wong

    IPC分类号： H04B1000

    CPC分类号： G02B6/272 ,  G02B6/2773 ,  G02B6/29302 ,  G02B6/29394 ,  H04B10/25133 ,  H04J14/02

    摘要： A stacked waveplate device that performs an optical wavelength filtering function is described which provides dispersion with a first magnitude and a first sign for a first optical path having a first output polarization and which provides a second dispersion with a substantially equal but oppositely-signed dispersion for a second optical path defining an output having an orthogonal polarization to the polarization of said first output path. Optical paths are configured to pass through first and second stacked waveplate devices sequentially with the optical dispersion of said second device having an approximately equal magnitude but opposite sign compared to the optical dispersion of the first optical stacked waveplate devices so as to provide canceling or compensation of optical dispersion. A device is configured to use cancellation or compensation of dispersion in sequential stacked waveplate devices to provide outputs with characteristics similar to outputs of previous stacked waveplate devices but with substantially reduced dispersion characteristics.

    摘要翻译： 描述了执行光学波长滤波功能的层叠波片装置，其为具有第一输出偏振的第一光路提供具有第一幅度和第一符号的色散，并且提供具有基本相等但相反符号色散的第二色散， 限定具有与所述第一输出路径的偏振正交偏振的输出的第二光路。 光路被配置成与第一光学叠层波片装置的光学色散相比，顺序地穿过第一和第二层叠波片装置，其中所述第二装置的光学色散与第一光学堆叠波片装置的光学色散相比具有大致相等的数量但相反的符号，以便提供 光学色散。 一种器件被配置为使用顺序层叠波片器件中的色散的消除或补偿来提供具有与先前堆叠波片器件的输出相似的特性的输出，但具有显着降低的色散特性。