公开(公告)号：US6094291A

公开(公告)日：2000-07-25

申请号：US68959

申请日：1998-05-20

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02F1/01 ,  G02F1/015 ,  G02F1/035 ,  G02F1/03

CPC classification number: G02F1/0115 ,  G02F1/011 ,  G02F1/0126 ,  G02F1/035 ,  G02F2001/0113 ,  G02F2001/0153

Abstract: An optical modulator includes a bi-moded fiber for supporting first and second different optical transmission modes, coupled between input and output single mode fibers. The two modes in the bi-moded fiber interfere and the intensity of the radiation that passes to the single mode output fiber is a function of the relative phases of the first and second modes. The bi-moded fiber is electrically poled and is provided with modulating electrodes. When a modulating voltage from a modulating source is applied to the electrodes, the refractive index of the waveguide for the first transmission mode is altered relative to the refractive index of the waveguide for the second mode such as to change the phase difference between the modes at the entrance to the output fiber so as to control the intensity of optical radiation that passes through the output fiber.

Abstract translation: PCT No.PCT / GB98 / 01010 Sec。 371日期：1998年5月20日 102（e）日期1998年5月20日PCT提交1998年4月6日PCT公布。 第WO98 / 47041号公报 日期1998年10月22日光调制器包括用于支持第一和第二不同光传输模式的双模光纤，耦合在输入和输出单模光纤之间。 双模光纤中的两种模式干扰，并且传递到单模输出光纤的辐射强度是第一和第二模式的相对相位的函数。 双模光纤被电极化并且设置有调制电极。 当来自调制源的调制电压被施加到电极时，用于第一传输模式的波导的折射率相对于用于第二模式的波导的折射率而改变，以改变模式之间的相位差 输出光纤的入口，以便控制通过输出光纤的光辐射的强度。

公开(公告)号：US6041069A

公开(公告)日：2000-03-21

申请号：US877997

申请日：1997-06-18

Applicant: Raman Kashyap ,  Jonathan Richard Armitage

Inventor： Raman Kashyap ,  Jonathan Richard Armitage

IPC: G02B5/18 ,  G02B6/00 ,  G02B6/02 ,  G02B6/124 ,  G02B6/13 ,  G02B6/34 ,  H01S3/067 ,  H01S3/30

CPC classification number: G02B6/02133 ,  G02B5/18 ,  G02B6/124 ,  G02B6/34 ,  H01S3/0675 ,  G02B6/02085 ,  G02B6/29322

Abstract: A resonant laser device including first and second reflectors defining an optical cavity with given optical resonance characteristics. The laser device including a laser active material in a first optical fiber disposed between the reflectors in the cavity and a second photosensitive optical fiber coupled to the cavity. One of the reflector being a refractive index grating formed in the second fiber such that the laser operates with a selected predetermined wavelength and the laser being tuned to a different wavelength by exposing the second fiber to a second spatially periodic pattern of optical radiation such that the second pattern becomes recorded in the second optical fiber.

Abstract translation: 一种谐振激光器件，包括第一和第二反射器，其限定具有给定光学谐振特性的光学腔。 所述激光装置包括位于所述空腔中的所述反射器之间的第一光纤中的激光活性材料和耦合到所述空腔的第二感光光纤。 反射器中的一个是形成在第二光纤中的折射率光栅，使得激光器以选定的预定波长进行操作，并且通过将第二光纤暴露于第二空间周期性的光学辐射图案将激光器调谐到不同的波长，使得 第二图案被记录在第二光纤中。

公开(公告)号：US5832011A

公开(公告)日：1998-11-03

申请号：US522424

申请日：1995-10-10

Applicant: Raman Kashyap

Inventor： Raman Kashyap

IPC: G02B6/02 ,  G02B6/34 ,  G02B6/42 ,  H01S3/067 ,  H01S5/00 ,  H01S5/022 ,  H01S5/14 ,  H04B10/02 ,  H04B10/28 ,  H01S3/10

CPC classification number: H01S5/146 ,  G02B6/421 ,  G02B6/4292 ,  H01S3/0675 ,  H01S3/094003 ,  H01S3/09415 ,  H01S3/1608 ,  H01S5/02284

Abstract: A laser having two feedback elements at least one which is wavelength selective, is provided with a demountable optical connector located between the gain medium of the laser and the wavelength selective feedback element. An optical waveguide is utilized to direct optical radiation between the demountable optical connector and the wavelength selective feedback element. The demountable optical connector, for example, a mechanical fibre connector allows the wavelength selective feedback element, for example, a fibre grating, to be exchanged cheaply, simply and quickly, and thus allows the wavelength of operation of the laser to be altered.

Abstract translation: PCT No.PCT / GB94 / 00556 Sec。 371 1995年10月10日第 102（e）日期1995年10月10日PCT 1994年3月18日PCT公布。 第WO94 / 22187号公报 日期1984年9月29日具有两个具有波长选择性的至少一个的反馈元件的激光器设置有位于激光器的增益介质和波长选择反馈元件之间的可拆卸光连接器。 使用光波导来引导可拆卸光连接器和波长选择反馈元件之间的光辐射。 可拆卸的光学连接器例如机械光纤连接器允许波长选择反馈元件（例如，光纤光栅）被廉价，简单且快速地交换，从而允许改变激光器的操作波长。

公开(公告)号：US5583689A

公开(公告)日：1996-12-10

申请号：US347298

申请日：1995-02-08

Applicant: Stephen Cassidy ,  Richard Wyatt ,  Raman Kashyap ,  Jonathan R. Armitage ,  Robert Campbell

Inventor： Stephen Cassidy ,  Richard Wyatt ,  Raman Kashyap ,  Jonathan R. Armitage ,  Robert Campbell

IPC: G02B5/18 ,  G02B5/20 ,  G02B5/28 ,  G02B6/124 ,  G02B6/34 ,  H01S3/06 ,  H01S3/07 ,  H01S3/10 ,  H04B10/294 ,  H01S3/00 ,  G02B27/00

CPC classification number: G02B6/02133 ,  G02B6/02085 ,  G02B6/02147 ,  G02B6/124 ,  G02B6/2931 ,  G02B6/29313 ,  G02B6/29319 ,  G02B6/29395 ,  H01S3/10023 ,  H04B10/2941 ,  H01S2301/04

Abstract: A filter has a preselected attenuation/wavelength characteristic, in which spatially separated parts of the filter attenuate different wavelengths. The spatially-separated parts have different attenuation characteristics to attenuate different wavelengths in a predetermined manner to provide a selected attenuation/wavelength characteristic. In one arrangement an interference type filter includes a grating, the pitch of which varies spatially. In one instance, the structure to determine the proportion of radiation subject to interference includes a grating of spatially-varying effectiveness, but alternatively it may include an attenuation filter, the attenuation effect of the attenuation layer varying spatially. In another arrangement, the filter may include structure to separate received radiation into a spatially-disposed spectrum, and to attenuate different parts of the spatially-disposed spectrum in such a manner as to provide the selected attenuation/wavelength characteristic.

Abstract translation: PCT No.PCT / GB93 / 01160 Sec。 371日期1995年2月8日 102（e）日期1995年2月8日PCT提交1993年6月1日PCT公布。 公开号WO93 / 24977 日期1993年12月9日一个滤波器具有预选的衰减/波长特性，其中滤波器的空间分离的部分衰减不同的波长。 空间分离的部分具有不同的衰减特性，以预定的方式衰减不同的波长，以提供选定的衰减/波长特性。 在一种布置中，干涉型滤波器包括其间距在空间上变化的光栅。 在一个实例中，确定受干扰的辐射比例的结构包括空间变化效应的光栅，但是也可以包括衰减滤波器，衰减层的衰减效应在空间上变化。 在另一种布置中，滤波器可以包括将接收的辐射分离成空间上放置的光谱的结构，并且以提供所选择的衰减/波长特性的方式衰减空间上放置的光谱的不同部分。

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

IPC: G02F1/37 ,  G02F1/35 ,  G02F1/377

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.