公开(公告)号：US20090231682A1

公开(公告)日：2009-09-17

申请号：US12355951

申请日：2009-01-19

Applicant: Raman Kashyap ,  Galina Nemova

Inventor： Raman Kashyap ,  Galina Nemova

IPC: H01S3/00

CPC classification number: H01S3/06754 ,  G01M11/319 ,  G02B6/02095 ,  H01S3/0675 ,  H01S3/06758 ,  H01S3/094007 ,  H01S3/10023 ,  H01S3/302 ,  H01S2301/02 ,  H01S2301/03

Abstract: Fiber light amplifiers adapted for high power application are provided. In embodiments of the invention, the light signal to be amplified is coupled to a cladding mode of an active waveguide region which is cladding doped. The amplified light is coupled to an output fiber have waveguiding properties matching those of the active cladding of the active waveguide region. In other embodiments, two or more amplifying stages are provided coupled by a wavelength selective loss element which couples the Stokes wave co-propagating with the signal to be amplified out of the signal guiding mode prior to the onset of SRS.

Abstract translation: 提供适用于大功率应用的光纤放大器。 在本发明的实施例中，要被放大的光信号耦合到作为包层掺杂的有源波导区域的包层模式。 放大的光耦合到具有与有源波导区域的有源包层匹配的波导特性的输出光纤。 在其它实施例中，通过波长选择性损耗元件耦合两个或更多个放大级，该波长选择性损耗元件在SRS发生之前将共同传播的斯托克斯波与要被放大的信号耦合出信号引导模式。

公开(公告)号：US20080267555A1

公开(公告)日：2008-10-30

申请号：US11914637

申请日：2006-05-15

Applicant: Raman Kashyap ,  Vincent Treanton ,  Luftu Celebi Ozcan

Inventor： Raman Kashyap ,  Vincent Treanton ,  Luftu Celebi Ozcan

IPC: G02B6/00

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：US07386021B2

公开(公告)日：2008-06-10

申请号：US11437791

申请日：2006-05-22

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: H01S3/04

CPC classification number: G02F1/0147 ,  G02F1/353 ,  G02F1/3775 ,  G02F2201/307 ,  H01S5/0092 ,  H01S5/02248 ,  H01S5/02407 ,  H01S5/02438 ,  H01S5/147

Abstract: In a first broad aspect, the invention provides a light source. The light source includes a semiconductor laser for emitting laser light at a first frequency. The light source also includes an optical fibre that includes a fibre Bragg grating. The fibre Bragg grating is optically coupled to the semiconductor laser for receiving the laser light, reflecting a reflected portion of the laser light towards the laser and allowing the transmitted portion of the laser light to pass through the fibre Bragg grating. The fibre Bragg grating has a temperature-dependant reflection spectrum. A frequency converting optical element is optically coupled to the fibre Bragg grating for receiving the transmitted portion of the laser light and converting at least a fraction of the transmitted portion of the laser light into a converted light having a second frequency different from the first frequency. An output port is optically coupled to the frequency converting optical element for outputting the converted light. A temperature controller is thermally coupled to the fibre Bragg grating for modulating a temperature of the fibre Bragg grating so as to modulate the reflection spectrum.

Abstract translation: 在第一个广泛的方面，本发明提供一种光源。 光源包括用于以第一频率发射激光的半导体激光器。 光源还包括包括光纤布拉格光栅的光纤。 光纤布拉格光栅光学耦合到半导体激光器以接收激光，将激光的反射部分反射向激光器并允许透射的部分激光通过光纤布拉格光栅。 光纤布拉格光栅具有温度依赖反射光谱。 频率转换光学元件光学耦合到光纤布拉格光栅，用于接收激光的透射部分，并将激光的透射部分的至少一部分转换为具有与第一频率不同的第二频率的转换光。 输出端口光耦合到变频光学元件，用于输出转换的光。 温度控制器热耦合到光纤布拉格光栅，用于调制光纤布拉格光栅的温度，以便调制反射光谱。

公开(公告)号：US20070064756A1

公开(公告)日：2007-03-22

申请号：US11437791

申请日：2006-05-22

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: H01S5/00

CPC classification number: G02F1/0147 ,  G02F1/353 ,  G02F1/3775 ,  G02F2201/307 ,  H01S5/0092 ,  H01S5/02248 ,  H01S5/02407 ,  H01S5/02438 ,  H01S5/147

Abstract: In a first broad aspect, the invention provides a light source. The light source includes a semiconductor laser for emitting laser light at a first frequency. The light source also includes an optical fibre that includes a fibre Bragg grating. The fibre Bragg grating is optically coupled to the semiconductor laser for receiving the laser light, reflecting a reflected portion of the laser light towards the laser and allowing the transmitted portion of the laser light to pass through the fibre Bragg grating. The fibre Bragg grating has a temperature-dependant reflection spectrum. A frequency converting optical element is optically coupled to the fibre Bragg grating for receiving the transmitted portion of the laser light and converting at least a fraction of the transmitted portion of the laser light into a converted light having a second frequency different from the first frequency. An output port is optically coupled to the frequency converting optical element for outputting the converted light. A temperature controller is thermally coupled to the fibre Bragg grating for modulating a temperature of the fibre Bragg grating so as to modulate the reflection spectrum.

Abstract translation: 在第一个广泛的方面，本发明提供一种光源。 光源包括用于以第一频率发射激光的半导体激光器。 光源还包括包括光纤布拉格光栅的光纤。 光纤布拉格光栅光学耦合到半导体激光器以接收激光，将激光的反射部分反射向激光器并允许透射的部分激光通过光纤布拉格光栅。 光纤布拉格光栅具有温度依赖反射光谱。 频率转换光学元件光学耦合到光纤布拉格光栅，用于接收激光的透射部分，并将激光的透射部分的至少一部分转换成具有与第一频率不同的第二频率的转换光。 输出端口光耦合到变频光学元件，用于输出转换的光。 温度控制器热耦合到光纤布拉格光栅，用于调制光纤布拉格光栅的温度，以便调制反射光谱。

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.