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    OPTICAL FIBER FOR LESSENING REFLECTION OF LIGHT SIGNAL
    2.
    发明专利
    OPTICAL FIBER FOR LESSENING REFLECTION OF LIGHT SIGNAL 失效

    公开(公告)号：JPH1144823A

    公开(公告)日：1999-02-16

    申请号：JP14137798

    申请日：1998-05-22

    Applicant: LITTON SYSTEMS INC

    Inventor： PAVLATH GEORGE A

    IPC: G02B6/02 ,  G02B6/24 ,  H01S3/06 ,  H01S3/17 ,  G02B6/10

    Abstract: PROBLEM TO BE SOLVED: To obtain an optical fiber which decreases reflected light within a prescribed limit by including a doped core and a doped end which encloses this doped core and absorbs the light radiated from the doped core. SOLUTION: This optical fiber includes the doped core and the doped end which encloses this doped core and absorbs the light radiated from the doped core. For example, the fiber 21 consists of a signal transmission section 30 and a signal attenuation section 50. The core 22 acts in such a manner that the light passes the inside of the fiber 21. At this time, the very small part of the light passing the core 22 leaks out of the circumference of the core 22. The absorption of the light is preferably higher in rate as the quantity of the light leaking from the region of the core 22 is higher. About 4% of the light in the small quantity of the light leaking from a high-absorption region is reflected at the boundary and returns to the fiber 21. The reflected light returns to the same high-absorption region. Such absorption is embodied by doping a material which absorbs the wavelength light released by the core 22 region to the region adjacent to the core 22.

    INTEGRATED OPTICS ENCRYPTION DEVICE
    3.
    发明申请
    INTEGRATED OPTICS ENCRYPTION DEVICE 审中-公开
    集成光学加密设备

    公开(公告)号：WO0180463A3

    公开(公告)日：2003-03-27

    申请号：PCT/US0112415

    申请日：2001-04-17

    Applicant: LITTON SYSTEMS INC

    Inventor： BEAN MICHAEL ,  BEAN LAWRENCE E ,  PAVLATH GEORGE A ,  GOLDNER ERIC LEE

    IPC: H04B10/12 ,  H04B10/145 ,  H04K1/00

    CPC classification number: H04B10/85

    Abstract: The present invention relates generally to an integrated optics encryption device. The preferred embodiment of the invention is an integrated optics encryption device comprising a coherent light source connected to a multi-functional integrated optics chip (MIOC). The MIOC comprises two divergent paths with mirrored ends. The MIOC also has an encrypted message output. One path is connected to a message signal input that can alter the refractive index of the path. The other path is connected to a key signal input that can alter the refractive index of the other path.

    Abstract translation: 本发明一般涉及一种集成光学加密装置。 本发明的优选实施例是包括连接到多功能集成光学芯片（MIOC）的相干光源的集成光学加密装置。 MIOC包括两条具有镜像端点的发散路径。 MIOC还具有加密的消息输出。 一条路径连接到可改变路径的折射率的消息信号输入。 另一个路径连接到可以改变另一路径的折射率的键信号输入。

    DEPOLARIZED FIBER OPTIC ROTATION SENSOR WITH LOW FARADAY EFFECT DRIFT
    4.
    发明申请
    DEPOLARIZED FIBER OPTIC ROTATION SENSOR WITH LOW FARADAY EFFECT DRIFT 审中-公开
    具有低FARADAY效果的分离光纤旋转传感器

    公开(公告)号：WO9603620A3

    公开(公告)日：1996-05-30

    申请号：PCT/US9509427

    申请日：1995-07-26

    Applicant: LITTON SYSTEMS INC

    Inventor： PAVLATH GEORGE A ,  MICHAL RONALD J ,  PATTERSON RALPH A ,  HUANG SIDNEY XI-YI

    IPC: G01C19/72 ,  G01R33/032

    CPC classification number: G01C19/721

    Abstract: A fiber optic sensing coil formed in a polarization-maintaining optical fiber has two optical fiber leads extending therefrom. A multifunction integrated optics chip linearly polarizes optical signals input to the sensing coil. Fiber optic leads formed of polarization-maintaining optical fiber extend from the multifunction integrated optics chip. The fiber optic multifunction integrated optics chip leads are arranged such that the linear polarization of optical signals output from the multifunction integrated optics chip is directed along one of the principal axes of birefringence of each of the fiber optic multifunction integrated optics chip leads. Splices are formed between corresponding the first sensing coil leads and the multifunction integrated optics chip leads. The sensing coil leads and the multifunction integrated optics chip leads are arranged such that their corresponding principal axes of birefringence are at angles of approximately 45° relative to one another. The first splice is formed a distance from the multifunction integrated optics chip such that a selected phase change between polarization components occurs in optical waves that propagate the distance L1 in the first multifunction integrated optics chip lead.

    METHOD FOR REDUCING RANDOM WALK IN FIBER OPTIC GYROSCOPES
    5.
    发明公开
    METHOD FOR REDUCING RANDOM WALK IN FIBER OPTIC GYROSCOPES 无效
    VERFAHREN ZUM REDUZIEREN DER ZUFALLSAUSWNDERUNG IN FASEROPTISCHEN KREISELN

    公开(公告)号：EP0809788A4

    公开(公告)日：1999-03-17

    申请号：EP95944825

    申请日：1995-12-28

    Applicant: LITTON SYSTEMS INC

    Inventor： PAVLATH GEORGE A

    IPC: G01C19/72 ,  G01C19/64

    CPC classification number: G01C19/72

    Abstract: A method for modulating a fiber optic gyroscope achieves a reduction in output noises beyond that possible through increased peak power with conventional phase modulation. A periodic modulation waveform (28) is applied to an electro-optic modulator, such as an MIOC, to induce a periodic phase shift phi M(t) where the form of the periodic phase shift is chosen such that the gyro random walk is below that associated with maximum output signal modulation.

    Abstract translation: 用于调制光纤陀螺仪的方法通过使用常规相位调制增加峰值功率而实现超出可能的输出噪声的减少。 周期性调制波形（28）被施加到诸如MIOC的电光调制器以引起周期性相移ΦM（t），其中周期性相移的形式被选择为使得陀螺仪随机游走低于 与最大输出信号调制有关。

    METHOD FOR REDUCING RANDOM WALK IN FIBER OPTIC GYROSCOPES
    8.
    发明专利
    METHOD FOR REDUCING RANDOM WALK IN FIBER OPTIC GYROSCOPES 未知

    公开(公告)号：CA2173871A1

    公开(公告)日：1997-06-29

    申请号：CA2173871

    申请日：1995-12-28

    Applicant: LITTON SYSTEMS INC

    Inventor： PAVLATH GEORGE A

    IPC: G01C19/72

    Abstract: A method for modulating a fiber optic gyroscope achieves a reduction in output noise beyond that possible through increased peak power with conventional phase modulation. A periodic modulation waveform is applied to an electro-optic modulator, such as an MIOC, to induce a periodic phase shift .PHI.M(t) where the form of the periodic phase shift is chosen such that the gyro random walk is below that associated with maximum output signal modulation.

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