公开(公告)号：US5719974A

公开(公告)日：1998-02-17

申请号：US500896

申请日：1995-08-01

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B6/02 ,  G02B6/12 ,  G02B6/34 ,  G02B6/42 ,  H01L31/0203 ,  H01S5/022 ,  H01S5/14

CPC classification number: G02B6/02133 ,  G02B6/12007 ,  G02B6/4202 ,  G02B6/4237 ,  G02B6/02123 ,  G02B6/29317 ,  G02B6/29353 ,  H01S5/02284 ,  H01S5/146

Abstract: A method of assembling a package including a photosensitively configured optical device providing a window positioned to allow optical frequency electromagnetic radiation from an external source to impinge on a photosensitive part of the optical device. In one embodiment a packaged intermediate product is fabricated, which may subsequently be formed into an external cavity semiconductor laser having certain specified characteristics, by writing a grating into a photosensitive fiber. Use of a window allows the characteristics of the laser to be defined after packaging so that, firstly a large stock of external cavity lasers having all possible characteristics need not be held, and secondly so that the reflectivity of the grating need be chosen only once the degree of coupling between the fiber and the laser diode has been established, thus enhancing the performance of the external cavity laser.

Abstract translation: PCT No.PCT / GB94 / 00180 Sec。 371日期1995年8月1日 102（e）日期1995年8月1日PCT 1994年1月31日PCT PCT。 公开号WO94 / 17448 日期1994年8月4日一种组装包括光敏配置的光学器件的封装的方法，该光学器件提供了一个窗口，该窗口被定位成允许来自外部源的光频电磁辐射撞击在光学器件的光敏部分上。 在一个实施例中，制造封装的中间产品，其随后可以通过将光栅写入感光纤维中而形成具有某些特定特性的外部腔半导体激光器。 使用窗口可以在包装之后定义激光的特性，因此首先需要保持具有所有可能特性的大量外部腔体激光器，其次，使光栅的反射率仅需要选择一次 已经建立了光纤和激光二极管之间的耦合度，从而提高了外腔激光器的性能。

公开(公告)号：US5530666A

公开(公告)日：1996-06-25

申请号：US39487

申请日：1993-04-30

Applicant: Raman Kashyap ,  Robert J. Campbell

Inventor： Raman Kashyap ,  Robert J. Campbell

IPC: G02B6/00 ,  G02B6/02 ,  G02B6/28 ,  G11C13/00 ,  G11C13/04 ,  G11C21/00 ,  H04B10/00 ,  H04B10/22 ,  G11C11/21

CPC classification number: G02B6/28 ,  G11C13/042 ,  G11C21/00

Abstract: The present invention is based on the use of a plurality of gratings recorded in an optical waveguide, the gratings having different Bragg wavelengths selected to store individual bits of data. The invention has particular application to optical fiber communications networks.

Abstract translation: PCT No.PCT / GB91 / 01966 Sec。 371日期1993年3月30日 102（e）1993年3月30日PCT 1991年11月8日PCT PCT。 出版物WO92 / 09078 日期：1992年5月29日。本发明基于使用记录在光波导中的多个光栅，选择具有不同布拉格波长的光栅来存储数据的各个位。 本发明特别适用于光纤通信网络。

公开(公告)号：US5305403A

公开(公告)日：1994-04-19

申请号：US862757

申请日：1992-06-24

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B6/02 ,  G02F1/37 ,  G02F1/383 ,  G02B6/34

CPC classification number: G02F1/383

Abstract: An optical waveguide in which the rate of change with wavelength of the reciprocal of the difference between the effective refractive indices of a fundamental wavelength mode and a second harmonic wavelength mode is zero at a first wavelength, and there is an internal periodic grating providing phase matching in the wavelength region of the first wavelength.

Abstract translation: PCT No.PCT / GB90 / 01917 Sec。 371日期：1992年6月24日 102（e）日期1992年6月24日PCT 1990年12月7日PCT PCT。 公开号WO91 / 09338 日期：1991年6月27日。一种光波导，其中基波长模式和二次谐波波长模式的有效折射率之间的差的倒数的波长的变化率在第一波长为零，并且存在 提供在第一波长的波长区域中的相位匹配的内部周期光栅。

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。

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

IPC: G02B6/00 ,  G02B6/02

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。

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

IPC: G02B6/02 ,  G02B6/12 ,  G02B6/124 ,  G02B6/16

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。

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

IPC: G02B6/00 ,  B23K26/00 ,  C03B37/15 ,  G02B6/02 ,  G02B6/255 ,  G02F1/01

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.

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

IPC: G01H9/00 ,  G01J9/02 ,  H01S3/139 ,  G01B9/02

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。

公开(公告)号：US20150205044A1

公开(公告)日：2015-07-23

申请号：US14595772

申请日：2015-01-13

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B6/245 ,  G02B6/36

CPC classification number: G02B6/245

Abstract: This invention relates to the modifying or stripping of primary or secondary coatings on optical fibres by the application of heat such that the coating is entirely or partially removed from the surface over a given length of an optical fibre while a tension is applied in the fibre. Also a clamp to hold the optical fibre when tension is applied.

Abstract translation: 本发明涉及通过施加热量来改变或剥离光纤上的初级或次级涂层，使得在光纤中施加张力时，涂层在给定长度的光纤上完全或部分地从表面上移除。 还有一个钳子，用于在施加张力时保持光纤。

公开(公告)号：US20100061689A1

公开(公告)日：2010-03-11

申请号：US12514743

申请日：2007-11-13

Applicant: Raman Kashyap ,  Vincent Treanton

Inventor： Raman Kashyap ,  Vincent Treanton

IPC: G02B6/10 ,  B29D11/00

CPC classification number: G02B6/136

Abstract: The present invention is concerned with a process for fabricating a buried optical waveguide, comprising providing a multi-layer piece of material having a waveguide core layer, generating a laser beam and producing by ablation at least two trenches by applying the laser beam onto the multi-layer piece of material. The two trenches extend through the multi-layer piece of material including the core layer. Upon the ablation, melted material from the multi-layer piece is produced and the core layer is encapsulated between the two trenches with the melted material to produce the buried optical waveguide in the multi-layer piece of material. The present invention also relates to a buried optical waveguide comprising a multi-layer piece of material having a waveguide core layer, at least two trenches laser ablated through the multi-layer piece of material including the core layer and encapsulating material having melted from the multi-layer piece upon laser ablation and leaked to cover and therefore encapsulate the core layer in the at least two trenches to thereby form the buried optical waveguide.

Abstract translation: 本发明涉及一种用于制造掩埋光波导的方法，包括提供具有波导芯层的多层材料片材，产生激光束并通过将激光束施加到多个多孔体上来消融至少两个沟槽产生 层材料。 两个沟槽延伸通过包括芯层的多层材料片。 在消融时，产生来自多层件的熔融材料，并且利用熔化的材料将芯层封装在两个沟槽之间，以在多层材料中产生掩埋光波导。 本发明还涉及一种掩埋光波导，其包括具有波导芯层的多层材料片材，至少两个激光器通过包括芯层的多层材料烧蚀并且从多层熔化的封装材料 激光烧蚀并且漏出以覆盖并因此将芯层封装在至少两个沟槽中，从而形成掩埋光波导。