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公开(公告)号：US5013115A
公开(公告)日：1991-05-07
申请号：US411529
申请日：1989-10-02
Applicant: Raman Kashyap
Inventor： Raman Kashyap
CPC classification number: G02F1/3544 , G02F1/377 , G02F2001/3546
Abstract: A polarization insensitive optical freqency mixer comprising an optical fiber coupler block (2), a silica fibre (6) with a region whose cladding (4) has been polished off close to the core (8) on which is rotatably mounted interdigitated electrodes (12) spaced from the coupler block (2) by a polymer film spacer (12). The electrodes (12) induce a spatially periodic electric field within the core (4) which reverses every half period which provides frequency doubling of light passing through the fibre (6) over the whole grating length. The electrodes are dimensioned to provide polarization insensitized frequency mixing by providing that the electric field components within the optical waveguide are substantially equal in two mutually orthogonal directions transverse the waveguide.
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公开(公告)号：US08411353B2
公开(公告)日：2013-04-02
申请号：US12855477
申请日：2010-08-12
Applicant: Raman Kashyap , Amirhossein Tehranchi
Inventor： Raman Kashyap , Amirhossein Tehranchi
IPC: G02F1/35
CPC classification number: G02F1/3775 , G02F2202/20
Abstract: There is provided an optical frequency converter comprising: an optical guiding structure having an input and an output, and comprising: a first grating portion adjacent to the input; a second grating portion adjacent to output, and a third grating between the first and second grating portion to form an apodized step-chirped grating extending between the input and the output. Each grating portion comprises a plurality of sections each comprising a plurality of segments. Each segment has a segment width and comprises a poled region having a poled width at least equal to one micron and a reversely poled region. The segment width for all of the grating portions and a duty ratio of the poled width to the segment width are constant within each section. The duty ratio increases within the first grating portion, decreases within the second grating portion, and is constant within the third grating portion.
Abstract translation: 提供一种光学变频器，包括：具有输入和输出的光导结构，包括：与输入相邻的第一光栅部分; 与输出相邻的第二光栅部分和在第一和第二光栅部分之间的第三光栅，以形成在输入和输出之间延伸的变迹的步进啁啾光栅。 每个光栅部分包括多个部分，每个部分包括多个部分。 每个段具有段宽度并且包括具有至少等于1微米的极化宽度的极化区域和反向极化区域。 所有光栅部分的片段宽度和极化宽度与片段宽度的占空比在每个部分内是恒定的。 占空比在第一光栅部分内增加，在第二光栅部分内减小，并且在第三光栅部分内是恒定的。
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公开(公告)号：US20120106893A1
公开(公告)日：2012-05-03
申请号：US13286335
申请日：2011-11-01
Applicant: Raman KASHYAP , Mathieu GAGNE
Inventor： Raman KASHYAP , Mathieu GAGNE
CPC classification number: G02B6/02147 , G02B6/02133
Abstract: There is described herein a method and system for inscribing gratings in optical waveguides. The waveguides may be hydrogen-free, germanium-free, low germanium, low hydrogen, and a combination thereof. Such gratings written in hydrogen-free fibers are suitable for sensor applications in which the use of hydrogen for photosensitizing fibers is undesirable owing to their increased sensitivity to nuclear radiation. The grating are formed by at least one pulse having a wavelength comprised between about 203 nm and about 240 nm. The laser source may be a Continuous Wave (CW) laser source or a pulsed laser source generating at least one pulse having a width in the order of nanoseconds (109).
Abstract translation: 这里描述了一种在光波导中刻录光栅的方法和系统。 波导可以是无氢的，无锗的，低锗的，低氢的，以及它们的组合。 这种用无氢纤维编写的光栅适用于传感器应用，其中使用氢气来感光纤维是不希望的，因为它们对核辐射的敏感度增加。 光栅由至少一个具有在约203nm和约240nm之间的波长的脉冲形成。 激光源可以是连续波（CW）激光源或脉冲激光源，其产生具有大约数毫安（109）的宽度的至少一个脉冲。
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34.发明授权Plasmon-polariton refractive-index fiber bio-sensor with fiber Bragg grating 失效具有光纤布拉格光栅的等离子体 - 偏振光折射率光纤生物传感器公开(公告)号：US07697796B2
公开(公告)日：2010-04-13
申请号：US11914637
申请日：2006-05-15
Applicant: Raman Kashyap , Vincent Treanton , Lutfu Celebi Ozcan
Inventor： Raman Kashyap , Vincent Treanton , Lutfu Celebi Ozcan
CPC classification number: G01N21/774 , G01N21/553 , G01N21/554 , G01N2021/7776 , G01N2021/7779
Abstract: An optical waveguide sensing method and device in which a waveguide layer receives an optical signal and propagates the optical signal in accordance with a predetermined optical waveguide propagation mode. A testing medium surface in communication with the waveguide layer is responsive to a testing medium for modifying at least one characteristic of the propagated optical signal in relation to a given parameter of the testing medium. In this manner, the modified characteristic of the propagated optical signal can be measured in view of determining the given parameter of the testing medium.
Abstract translation: 一种光波导传感方法和装置，其中波导层接收光信号并根据预定的光波导传播模式传播光信号。 与波导层通信的测试介质表面响应于测试介质，用于相对于测试介质的给定参数修改传播的光信号的至少一个特性。 以这种方式，考虑到确定测试介质的给定参数，可以测量传播的光信号的修改特性。
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Patent Agency Ranking
公开(公告)号：US20090260501A1
公开(公告)日：2009-10-22
申请号：US12426746
申请日：2009-04-20
Applicant: Raman KASHYAP
Inventor： Raman KASHYAP
CPC classification number: G01H9/004 , G01D5/35345 , G01K11/32 , G01L1/242
Abstract: There is described an optical fiber sensor for sensing one of vibration, temperature, and strain, comprising: a laser source; a first single mode optical fiber having a first end and a second end, the first end connected to the laser source for receiving and propagating light from the laser source; a multimode optical fiber having a first end and a second end, the first end connected to the second end of the first single mode optical fiber for receiving the light and thereby exciting a plurality of modes of the multimode optical fiber, the multimode optical fiber being stretched at an out of band frequency and operated at a point at which an output is a linear function of a displacement of the multimode fiber; and a sampling photo-detector module connected to the second end of the multimode optical fiber for spatially filtering an output of the multimode fiber to obtain a spatially filtered interference pattern, and for detecting a variation of the spatially filtered interference pattern when one of the vibration, temperature, and strain is applied to the multimode optical fiber.
Abstract translation: 描述了用于感测振动，温度和应变之一的光纤传感器，包括：激光源; 第一单模光纤，具有第一端和第二端，所述第一端连接到所述激光源，用于接收和传播来自所述激光源的光; 具有第一端和第二端的多模光纤，所述第一端连接到所述第一单模光纤的第二端，用于接收所述光，从而激发所述多模光纤的多种模式，所述多模光纤为 在带外频率下拉伸，并在输出是多模光纤的位移的线性函数的点处操作; 以及连接到所述多模光纤的第二端的采样光检测器模块，用于对所述多模光纤的输出进行空间滤波以获得空间滤波的干涉图案，并且用于当所述振动中的一个振动 ，温度和应变被施加到多模光纤。
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公开(公告)号：US6104852A
公开(公告)日：2000-08-15
申请号：US29841
申请日：1998-03-09
Applicant: Raman Kashyap
Inventor： Raman Kashyap
CPC classification number: G02B6/021 , G02B6/124 , G02B6/02085 , G02B6/02114 , G02B6/02133
Abstract: An optical fibre in a core and a cladding that includes an inner cladding region with a refractive index that is photosensitive to UV light, surrounded by a non-photosensitive outer cladding region. Refractive index gratings can be written into the cladding region. Also, the refractive index of the inner region can be altered by exposure to UV light to achieve mode matching at a splice between fibres with different core diameters. An optical fibre laser is disclosed with integral refractive index gratings in the cladding of a fibre with an optically active core.
Abstract translation: PCT No.PCT / GB97 / 00128 Sec。 371日期1998年3月9日 102（e）1998年3月9日PCT 1997年1月17日PCT PCT。 公开号WO97 / 26571 日期1997年7月24日在芯和包层中的光纤，其包括具有对UV光敏感的折射率的内包层区域，被非感光外包层区域包围。 折射率光栅可以写入包层区域。 而且，内部区域的折射率可以通过暴露于UV光来改变，以在具有不同芯径的纤维之间的接合处实现模式匹配。 公开了一种光纤激光器，其在具有光学活性芯的光纤的包层中具有整体折射率光栅。
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公开(公告)号：US5377288A
公开(公告)日：1994-12-27
申请号：US940960
申请日：1992-11-03
Applicant: Raman Kashyap , Jonathan R. Armitage
Inventor： Raman Kashyap , Jonathan R. Armitage
CPC classification number: G02B6/02133 , G02B5/18 , G02B6/124 , G02B6/34 , H01S3/0675 , G02B6/02085 , G02B6/29322
Abstract: An optical fibre is fixed against a first face of a prism. A coherent beam of optical radiation is directed at the prism such that a portion B propagates directly to the first face while a second portion propagates via total internal reflection at a second face. The interference of the two portions creates a refractive index grating in the fibre at a wavelength longer than that of the radiation. The method provides a stable and simple method of sidewriting of waveguide gratings.
Abstract translation: PCT No.PCT / GB91 / 00452 Sec。 371日期：1992年11月3日 102（e）日期1992年11月3日PCT 1991年3月26日PCT公布。 公开号WO91 / 15787 日期为1991年10月17日。光纤固定在棱镜的第一面上。 相干的光辐射束被引导到棱镜，使得部分B直接传播到第一面，而第二部分经由第二面的全内反射传播。 这两个部分的干涉在波长比辐射长的波长处在光纤中产生折射率光栅。 该方法提供了一种稳定简单的波导光栅侧写方法。
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公开(公告)号：US5022734A
公开(公告)日：1991-06-11
申请号：US348700
申请日：1989-05-01
Applicant: Raman Kashyap
Inventor： Raman Kashyap
CPC classification number: B23K26/0057 , C03B37/15 , G02B6/02128 , G02B6/2552
Abstract: A method of structurally modifying a silica monomode optical fiber (4) by launching optical power into the fiber (4) from an Nd:YAG laser operating at 1.064 .mu.m and raising the temperature of a portion of the fiber (4) by bringing a metal film (12) into contact with a polished half-coupler block (6) to absorb energy from the laser (2). A structural modification of the fiber is initiated which propagates towards the laser (2) sustained by the optical power. It provides a means of decommissioning an optical fiber. The modified optical fiber (4) has regular periodic damage sites which can be used to form a diffraction grating. The method may also be used as an optical power limiter to protect optical networks from too high optical power inputs.
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公开(公告)号：US4767210A
公开(公告)日：1988-08-30
申请号：US23906
申请日：1987-03-10
Applicant: Raman Kashyap
Inventor： Raman Kashyap
CPC classification number: G01J9/02 , G01H9/004 , H01S3/1392 , G01J2009/0226
Abstract: An optical fibre Michelson interferometer has mirrors of highly reflective coatings deposited on the ends of the fibres forming the free arms of the interferometer. The interferometer preferably comprises single mode fibres, and is operated by a frequency swept laser.The interferometer has applications in the optical fibre interferometer sensing field.
Abstract translation: 光纤迈克尔逊干涉仪具有沉积在形成干涉仪的自由臂的纤维端部上的高反射涂层的反射镜。 干涉仪优选地包括单模光纤，并且由扫频激光器操作。 干涉仪在光纤干涉仪感应领域有应用。
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