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：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：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

IPC: G02B5/18 ,  G02B6/00 ,  G02B6/02 ,  G02B6/124 ,  G02B6/13 ,  G02B6/34 ,  H01S3/067

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。

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：US06284437B1

公开(公告)日：2001-09-04

申请号：US09051122

申请日：1998-04-01

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B616

CPC classification number: G02B6/02152 ,  G02B6/02085 ,  G02B6/02133 ,  G02B6/02138

Abstract: A device for recording a refractive index pattern in a photosensitive optical fiber includes a rotary disc formed with a phase mask in a circular pattern, which is rotated by an axis. The phase mask is illuminated with laser light in a region so that a moving interference pattern is formed. The optical fiber is moved along a path in synchronism with the moving interference pattern so that the pattern becomes recorded in the fiber. The pattern can be formed continuously over long fiber lengths, e.g., of the order of one meter.

Abstract translation: 用于在光敏光纤中记录折射​​率图案的装置包括：旋转盘，其形成有以轴为中心旋转的圆形图案的相位掩模。 在一个区域中用激光照射相位掩模，从而形成移动的干涉图案。 光纤沿着与移动干涉图案同步的路径移动，使得图案被记录在光纤中。 该图案可以在长纤维长度上连续地形成，例如大约一米。

公开(公告)号：US06229945B1

公开(公告)日：2001-05-08

申请号：US09372038

申请日：1999-08-11

Applicant: Benjamin J Ainslie ,  Douglas L Williams ,  Graeme D Maxwell ,  Raman Kashyap ,  Jonathan R Armitage

Inventor： Benjamin J Ainslie ,  Douglas L Williams ,  Graeme D Maxwell ,  Raman Kashyap ,  Jonathan R Armitage

IPC: G02B602

CPC classification number: G02B6/021 ,  C03B19/1453 ,  C03B37/01853 ,  C03B2201/31 ,  C03C3/06 ,  C03C3/076 ,  C03C4/04 ,  C03C13/045 ,  C03C2201/31 ,  C03C2203/50 ,  G02B6/02133 ,  G02B6/124

Abstract: It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and, therefore, B2O3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO2 and B2O3 are particularly suitable when the grating is to be localized in the cladding of a fiber. Glasses containing SiO2, GeO2, and B2O3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fiber.

Abstract translation: 已经证明含B玻璃对225-275nm波段的辐射敏感，因此B 2 O 3玻璃特别适于接收折射率调制，例如制造反射光栅。 当光栅定位在纤维的包层中时，含有SiO 2和B 2 O 3的玻璃特别适合。 当光栅位于波导的路径区域中时，例如在纤维的芯中，含有SiO 2，GeO 2和B 2 O 3的玻璃是合适的。