公开(公告)号：US4923278A

公开(公告)日：1990-05-08

申请号：US32964

申请日：1987-03-31

Applicant: Raman Kashyap ,  Michael H. Reeve ,  Stephen A. Cassidy ,  Stephen Hornung

Inventor： Raman Kashyap ,  Michael H. Reeve ,  Stephen A. Cassidy ,  Stephen Hornung

IPC: G02B6/00 ,  G02B6/02 ,  G02B6/036 ,  G02B6/28 ,  G02B6/34 ,  G02B6/36 ,  G02B6/44 ,  G02F1/01 ,  G02F1/133

CPC classification number: G02B6/02 ,  G02F1/0115 ,  G02F1/132 ,  G02B6/02033 ,  G02B6/2861 ,  G02B6/3628

Abstract: An optical fibre has a coating of, for example, liquid crystal polymer which causes temperature-dependent stress-induced changes in the optical fibre such as to counteract temperature-induced changes in the transmission delay of the fibre.

Abstract translation: 光纤具有例如液晶聚合物的涂层，其导致光纤中温度依赖性应力引起的变化，以抵消温度引起的光纤传输延迟的变化。

公开(公告)号：US4840461A

公开(公告)日：1989-06-20

申请号：US103734

申请日：1987-10-02

Applicant: Christopher S. Winter ,  Raman Kashyap

Inventor： Christopher S. Winter ,  Raman Kashyap

IPC: G02B6/00 ,  C09K19/30 ,  G02F1/13 ,  G02F1/1333 ,  G02F1/137 ,  G02F1/31 ,  G02F1/313

CPC classification number: G02F1/1326 ,  C09K19/3001 ,  G02F1/3131

Abstract: An optical switch, e.g. a blocking switch or a coupler switch, has a liquid crystal control element which, in at least one of its control configurations, has a splayed molecular orientation. In a preferred embodiment the liquid crystal is surrounded by chemical control surfaces, e.g. by homeotropically coated control surfaces.

公开(公告)号：US20150043598A1

公开(公告)日：2015-02-12

申请号：US14454220

申请日：2014-08-07

Applicant: Raman Kashyap ,  Sebastien Loranger ,  Victor Lambin Iezzi

Inventor： Raman Kashyap ,  Sebastien Loranger ,  Victor Lambin Iezzi

IPC: H01S3/30 ,  H01S3/094 ,  H01S3/16 ,  H01S3/11 ,  H01S3/067 ,  H01S3/08

CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/06791 ,  H01S3/08013 ,  H01S3/094023 ,  H01S3/10092 ,  H01S3/11 ,  H01S3/1698

Abstract: The method generally has the steps of propagating a seed wave in an optical fiber; generating a wave of first order by stimulated Brillouin scattering of the seed wave in the optical fiber, the wave of first order having a frequency spectrally shifted from the seed wave and being backscattered from the seed wave; propagating the seed wave and the wave of first order in a feedback cavity thereby generating a plurality of waves of higher order, each wave of higher order being cascadely generated by the wave of previous order, each wave of higher order being backscattered and having a frequency spectrally shifted from its corresponding wave of previous order and forming a frequency comb with the seed wave and the wave of first order; the frequency comb generating optical pulses; and propagating the generated optical pulses out of the feedback cavity.

Abstract translation: 该方法通常具有在光纤中传播种子波的步骤; 通过光纤中的种子波的受激布里渊散射产生一阶波，一阶波具有从种子波频谱偏移并从种子波反向散射的频率; 在反馈空腔中传播种子波和一阶波，从而产生多个较高阶的波，高阶的每个波由前一阶的波级联地产生，高阶的每个波都被反向散射并具有频率 从其先前顺序的相应波形光谱移位，并形成与种子波和一阶波的频率梳; 频率梳生成光脉冲; 并将产生的光脉冲传播出反馈空腔。

公开(公告)号：US20080264910A1

公开(公告)日：2008-10-30

申请号：US11575285

申请日：2004-10-05

Applicant: Raman Kashyap ,  Vincent Treanton

Inventor： Raman Kashyap ,  Vincent Treanton

IPC: B23K26/36

CPC classification number: C03C23/0025 ,  B23K26/0613 ,  B23K26/067 ,  B23K26/40 ,  B23K2103/42 ,  B23K2103/50 ,  G02B6/10 ,  G02B6/13

Abstract: A one step process for fabricating planar optical waveguides comprises using a laser to cut at least two channels in a substantially planar surface of a piece of dielectric material defining a waveguide there between. The shape and size of the resulting guide can be adjusting by selecting an appropriate combination of laser beam spatial profile, of its power and of the exposure time. A combination of heating and writing lasers can also be used to fabricate waveguides in a dielectric substrate, wherein the heating laser heats the substrate with a relatively broad focused spot, the power of the heating laser being controlled to raise the temperature heating the substrate just below the substrate's threshold temperature at which it begins to absorb electro-magnetic radiation, the writing laser, which yields a spot size smaller than the heating laser then melts the substrate within the focal spot of the heating laser. Compare to processes from the prior art, a waveguide fabrication process according to the present invention results in lower cost, faster processing time and applicability to a wider range of materials. The present process is particularly suited for the mass production of inexpensive photonic devices.

Abstract translation: 用于制造平面光波导的一步法包括使用激光器在限定其间的波导的一块电介质材料的基本上平坦的表面中切割至少两个通道。 可以通过选择激光束空间分布，其功率和曝光时间的适当组合来调整所得到的引导件的形状和尺寸。 加热和写入激光器的组合也可用于在电介质基底中制造波导，其中加热激光器用相对宽的聚焦点加热基底，加热激光器的功率被控制以提高温度加热衬底 基板的开始吸收电磁辐射的阈值温度，产生小于加热激光器的光斑尺寸的写入激光器然后熔化加热激光器焦点内的基板。 与现有技术的工艺相比，根据本发明的波导制造工艺导致更低的成本，更快的处理时间和对更宽范围的材料的适用性。 本发明的方法特别适用于批量生产廉价光子器件。

公开(公告)号：US20070284767A1

公开(公告)日：2007-12-13

申请号：US11785776

申请日：2007-04-20

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: B29D11/00

CPC classification number: B29D11/00663 ,  G02B6/245

Abstract: A method for treating an optical fiber according to a predetermined treatment, the optical fiber including a light guide and a coating, said coating covering, at least in part, said light guide, said method comprising: heating said coating along a portion thereof to a temperature such that said coating is treated according to said predetermined treatment; and transferring heat to said optical fiber at a rate small enough for substantially preventing said optical fiber from melting.

Abstract translation: 一种根据预定处理的光纤的处理方法，所述光纤包括光导和涂层，所述涂层至少部分地覆盖所述光导，所述方法包括：将所述涂层沿其一部分加热至 温度使得所述涂层根据所述预定处理进行处理; 并以足够小的速率将热量传递到所述光纤，以便基本上防止所述光纤熔化。

公开(公告)号：US06307679B1

公开(公告)日：2001-10-23

申请号：US09011995

申请日：1998-03-09

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B518

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

Abstract: An apodised refractive index grating is recorded in a photosensitive optical fiber by forming first and second component interference patterns with different pitches, that are recorded in the grating such as to result in apodisation. The component patterns are spatially in phase in a central region and move progressively out of phase towards the ends of the patterns. The patterns may be recorded sequentially or concurrently. The fiber may be stretched once or cylically.

公开(公告)号：US06075625A

公开(公告)日：2000-06-13

申请号：US302931

申请日：1994-09-22

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: G02B5/18 ,  C03B19/14 ,  C03B37/018 ,  C03C3/06 ,  C03C3/076 ,  C03C4/04 ,  C03C13/04 ,  G02B6/02 ,  G02B6/124 ,  G03H1/00 ,  G02B6/34

CPC classification number: G02B6/021 ,  C03B19/1453 ,  C03B37/01853 ,  C03C13/045 ,  C03C3/06 ,  C03C3/076 ,  C03C4/04 ,  G02B6/124 ,  C03B2201/31 ,  C03C2201/31 ,  C03C2203/50 ,  G02B6/02133 ,  Y10S359/90

Abstract: It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and, therefore, B.sub.2 O.sub.3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO.sub.2 and B.sub.2 O.sub.3 are particularly suitable when the grating is to be localized in the cladding of a fiber. Glasses containing SiO.sub.2, GeO.sub.2, and B.sub.2 O.sub.3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fiber.

Abstract translation: PCT No.PCT / GB93 / 01321 Sec。 371日期1994年9月22日 102（e）日期1994年9月22日PCT提交1993年6月24日PCT公布。 公开号WO94 / 00784 日期1994年1月6日已经证明含B的玻璃对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。

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。