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    Variable delay device for an optical component such as a polarization mode dispersion compensator
    3.
    发明授权
    Variable delay device for an optical component such as a polarization mode dispersion compensator 失效
    用于诸如偏振模色散补偿器的光学部件的可变延迟器件

    公开(公告)号：US06417948B1

    公开(公告)日：2002-07-09

    申请号：US09663755

    申请日：2000-09-15

    申请人： Dipakbin Q. Chowdhury ,  Robert G. Lindquist ,  Ashiqur Rahman

    发明人： Dipakbin Q. Chowdhury ,  Robert G. Lindquist ,  Ashiqur Rahman

    IPC分类号： H04B1000

    CPC分类号： H04B10/2569

    摘要： A variable delay device of the type used to correct for polarization mode dispersion in a signal transmitted over an optical communications system. In an exemplary embodiment, the variable delay device uses a plurality of polarization rotators and delay elements aligned in series and alternating with one another. The polarization rotators map the fast polarization mode component of the incoming optical signal to the slow axes of one or more delay elements, to achieve a desired pattern of relative incremental delays which total the initial differential delay being compensated. The delay elements may have uniform or non-uniform incremental delay values, and the polarization rotators may be selectively actuated to achieve the desired pattern of delay values corresponding to the intended total delay. Examples of suitable delay devices include waveguides having relatively high differential group delay characteristics associated with two orthogonal axes compared with conventional single-mode transmission fiber, and examples of suitable polarization rotators include twisted nematic liquid crystal (TNLC) or ferroelectric liquid crystal (FLC) cells which rotate the polarization mode components of the optical signal by 90° when actuated.

    摘要翻译： 一种用于校正通过光通信系统传输的信号中的偏振模色散的类型的可变延迟器件。 在示例性实施例中，可变延迟装置使用多个串联对准且相互交替的偏振旋转器和延迟元件。 偏振旋转器将输入光信号的快速偏振模式分量映射到一个或多个延迟元件的慢轴，以实现所需的相对增量延迟模式，其总和将补偿初始差分延迟。 延迟元件可以具有均匀或不均匀的增量延迟值，并且偏振旋转器可以被选择性地致动以实现对应于预期总延迟的期望模式的延迟值。 合适的延迟装置的实例包括与常规单模传输光纤相比具有与两个正交轴相关联的具有相对较高差分组延迟特性的波导，合适的偏振旋转器的示例包括扭曲向列型液晶（TNLC）或铁电液晶（FLC） 其在致动时将光学信号的偏振模式分量旋转90°。

    All fiber polarization mode dispersion compensator
    7.
    发明授权
    All fiber polarization mode dispersion compensator 失效
    全光纤偏振模色散补偿器

    公开(公告)号：US06556732B1

    公开(公告)日：2003-04-29

    申请号：US09589423

    申请日：2000-06-07

    申请人： Dipakbin Q. Chowdhury ,  Edward F. Murphy ,  Razvigor B. Ossikovski ,  Donald J. Sobiski

    发明人： Dipakbin Q. Chowdhury ,  Edward F. Murphy ,  Razvigor B. Ossikovski ,  Donald J. Sobiski

    IPC分类号： G02B600

    CPC分类号： H04B10/25133 ,  H04B10/2569

    摘要： A polarization mode dispersion compensator corrects polarization mode dispersion in an optical signal having a fast polarization mode component, a slow polarization mode component and a time differential between the components. The compensator includes a phase shifter and a variable delay section. An input of the phase shifter is coupled to an optical device that provides an optical signal that exhibits polarization mode dispersion. The phase shifter functions to rotate the optical signal principal states of polarization to a desired orientation. The variable delay section includes an input, an output and at least one optical fiber delay line. The input of the variable delay section is coupled to the output of the phase shifter and the desired orientation of the optical signal principal states of polarization are substantially rotated to be in alignment with one of a fast axis and a slow axis of each of the one or more fiber delay lines. In this manner, the variable delay section functions to delay the principal states of polarization of the optical signal with respect to one another as a function of whether the principal states of polarization traverse said one of a fast axis and a slow axis of the at least one optical fiber delay line, thus reducing the time differential between the components.

    摘要翻译： 偏振模色散补偿器校正具有快速偏振模式分量，慢偏振模分量和分量之间的时间差的光信号中的偏振模色散。 补偿器包括移相器和可变延迟部分。 移相器的输入耦合到提供呈现偏振模色散的光信号的光学装置。 移相器用于将光学信号的主要偏振状态旋转到期望的取向。 可变延迟部分包括输入，输出和至少一个光纤延迟线。 可变延迟部分的输入耦合到移相器的输出，并且光信号的主要偏振状态的期望取向基本上旋转以与一个的每个的快轴和慢轴中的一个对准 或更多的光纤延迟线。 以这种方式，可变延迟部分用于延迟光信号的相对于彼此的偏振的主要状态，作为偏振的主要状态是否穿过至少至少的快轴和慢轴的所述一个 一个光纤延迟线，从而减少组件之间的时差。

    Tunable optical fiber bragg and long period grating
    8.
    发明授权
    Tunable optical fiber bragg and long period grating 失效
    可调谐光纤布拉格和长周期光栅

    公开(公告)号：US06498877B1

    公开(公告)日：2002-12-24

    申请号：US09623406

    申请日：2000-09-05

    申请人： Dipakbin Q. Chowdhury ,  Kevin B. Sparks

    发明人： Dipakbin Q. Chowdhury ,  Kevin B. Sparks

    IPC分类号： G02B634

    CPC分类号： G02F1/0134 ,  G02B6/02095 ,  G02B6/02104 ,  G02B6/02195 ,  G02F1/0115 ,  G02F1/365 ,  G02F2201/307

    摘要： Disclosed is a tunable optical filter which may be used in telecommunications systems. The filter comprises a single mode optical waveguide containing a grating. The resonance wavelength of the filter is changed by changing the boundary condition at the interface between the cladding layer and an additional layer applied to the outer cladding layer surface. This boundary condition is changed by changing the refractive index of the additional layer. Means for changing the refractive index of the additional layer include establishing a structural resonance in the additional layer, or forming the additional layer from electro-optic or piezoelectric materials.

    摘要翻译： 公开了可用于电信系统的可调谐滤光器。 滤波器包括包含光栅的单模光波导。 通过改变包覆层和施加到外包层表面的附加层之间的界面处的边界条件来改变滤光器的共振波长。 通过改变附加层的折射率来改变该边界条件。 用于改变附加层的折射率的手段包括在附加层中建立结构共振，或者从电光或压电材料形成附加层。

    Dispersion managed optical fiber
    9.
    发明授权
    Dispersion managed optical fiber 失效
    色散管理光纤

    公开(公告)号：US5887105A

    公开(公告)日：1999-03-23

    申请号：US54340

    申请日：1998-04-02

    申请人： Venkata A. Bhagavatula ,  Dipakbin Q. Chowdhury

    发明人： Venkata A. Bhagavatula ,  Dipakbin Q. Chowdhury

    IPC分类号： G02B6/02 ,  G02B6/34

    CPC分类号： G02B6/02247 ,  G02B6/29392

    摘要： Disclosed is a dispersion managed optical waveguide fiber. The power loss due to four wave mixing is kept low by making the waveguide from sub-lengths of fiber which have non-zero dispersion. The sign of the total dispersion of the sub-lengths is made to alternate along the length of the waveguide, thereby allowing the total dispersion of the waveguide to be managed to a pre-selected target value. It has been discovered that the best performance is obtained when the zero dispersion wavelengths of the sub-lengths are widely and asymmetrically separated. Advantages are realized when the core refractive index profile is changed for sub-lengths having total dispersion of different sign.

    摘要翻译： 公开了一种色散管理光波导光纤。 通过使波导从具有非零色散的光纤的子长度来保持由于四波混频引起的功率损耗。 使子长度的总色散的符号沿着波导的长度交替，从而允许将波导的总色散管理到预选的目标值。 已经发现，当子长度的零色散波长被广泛和不对称地分离时，获得最佳性能。 当对具有不同符号的总色散的子长度改变纤芯折射率分布时，实现优点。