公开(公告)号：US5588085A

公开(公告)日：1996-12-24

申请号：US633323

申请日：1996-04-17

Applicant: Benjamin I. Greene ,  Chellappan Narayanan ,  Herman M. Presby

Inventor： Benjamin I. Greene ,  Chellappan Narayanan ,  Herman M. Presby

IPC: G02B6/14 ,  C03C23/00 ,  G02B6/02 ,  G02B6/12 ,  G02B6/122 ,  C03B37/023

CPC classification number: G02B6/122 ,  C03C23/002 ,  G02B2006/12195

Abstract: A method of making a silicate optical waveguide structure for transforming an optical beam of a first modal spot size to a beam of a second modal spot size includes the step of selecting an irradiation energy which is at least partially absorbed by the cladding of the structure. A variable dosage of radiation is then provided along the length of the structure. The radiation has an energy equal to the selected irradiation energy so that a refractive index change of the cladding is greater than a refractive index change of the core.

Abstract translation: 制造用于将第一模式光斑尺寸的光束变换为第二模式光点尺寸的光束的硅酸盐光波导结构的方法包括选择至少部分地被结构的包层吸收的照射能量的步骤。 然后沿着结构的长度提供可变剂量的辐射。 辐射具有等于所选择的照射能量的能量，使得包层的折射率变化大于芯的折射率变化。

公开(公告)号：US09252559B2

公开(公告)日：2016-02-02

申请号：US13545497

申请日：2012-07-10

Applicant: Chellappan Narayanan ,  Glen A. Sanders ,  Lee K. Strandjord ,  Jianfeng Wu

Inventor： Chellappan Narayanan ,  Glen A. Sanders ,  Lee K. Strandjord ,  Jianfeng Wu

IPC: H01S3/10 ,  G01C19/72

CPC classification number: H01S3/10023 ,  G01C19/721 ,  G01C19/727 ,  G02B6/00 ,  G02B6/02195 ,  G02B6/29316 ,  G02B6/29322 ,  G02B6/29356

Abstract: An optical-fiber filter system to narrow a linewidth and to reduce noise fluctuations of an optical beam is provided. The optical-fiber filter system includes an optical fiber having a first end-face and an opposing second end-face, the first end-face and the second end-face setting a fiber length; a fiber Bragg grating having a first reflectivity positioned at the first end-face; and a reflector having a second reflectivity positioned at the second end-face. When the optical beam at a first frequency is coupled from a laser into one of the first end-face or the second end-face, a resonant cavity is established at the first frequency between the fiber Bragg grating and the reflector while Brillouin scattered light shifted from the first frequency within the optical fiber is transmitted through the fiber Bragg grating.

Abstract translation: 提供了一种用于缩小线宽并减少光束的噪声波动的光纤滤波器系统。 光纤滤波器系统包括具有第一端面和相对的第二端面的光纤，第一端面和第二端面设置光纤长度; 光纤布拉格光栅，其具有位于所述第一端面处的第一反射率; 以及具有位于第二端面处的第二反射率的反射器。 当第一频率的光束从激光器耦合到第一端面或第二端面中的一个时，在光纤布拉格光栅和反射器之间的第一频率处建立谐振腔，而布里渊散射光偏移 从光纤内的第一频率通过光纤布拉格光栅传输。

公开(公告)号：US20140204387A1

公开(公告)日：2014-07-24

申请号：US13545497

申请日：2012-07-10

Applicant: Chellappan Narayanan ,  Glen A. Sanders ,  Lee K. Strandjord ,  Jianfeng Wu

Inventor： Chellappan Narayanan ,  Glen A. Sanders ,  Lee K. Strandjord ,  Jianfeng Wu

IPC: H01S3/10 ,  G01C19/72

CPC classification number: H01S3/10023 ,  G01C19/721 ,  G01C19/727 ,  G02B6/00 ,  G02B6/02195 ,  G02B6/29316 ,  G02B6/29322 ,  G02B6/29356

Abstract: An optical-fiber filter system to narrow a linewidth and to reduce noise fluctuations of an optical beam is provided. The optical-fiber filter system includes an optical fiber having a first end-face and an opposing second end-face, the first end-face and the second end-face setting a fiber length; a fiber Bragg grating having a first reflectivity positioned at the first end-face; and a reflector having a second reflectivity positioned at the second end-face. When the optical beam at a first frequency is coupled from a laser into one of the first end-face or the second end-face, a resonant cavity is established at the first frequency between the fiber Bragg grating and the reflector while Brillouin scattered light shifted from the first frequency within the optical fiber is transmitted through the fiber Bragg grating.

Abstract translation: 提供了一种用于缩小线宽并减少光束的噪声波动的光纤滤波器系统。 光纤滤波器系统包括具有第一端面和相对的第二端面的光纤，第一端面和第二端面设置光纤长度; 光纤布拉格光栅，其具有位于所述第一端面处的第一反射率; 以及具有位于第二端面处的第二反射率的反射器。 当第一频率的光束从激光器耦合到第一端面或第二端面中的一个时，在光纤布拉格光栅和反射器之间的第一频率处建立谐振腔，而布里渊散射光偏移 从光纤内的第一频率通过光纤布拉格光栅传输。

公开(公告)号：US20100284018A1

公开(公告)日：2010-11-11

申请号：US12463887

申请日：2009-05-11

Applicant: Tiequn Qiu ,  Steven J. Sanders ,  Chellappan Narayanan

Inventor： Tiequn Qiu ,  Steven J. Sanders ,  Chellappan Narayanan

IPC: G01C19/72

CPC classification number: G01C19/721

Abstract: Effective relative intensity noise (RIN) subtraction systems and methods for improving ARW performance of a depolarized gyros. This invention taps the RIN detector light in the sensing loop, after the light transmits through the depolarizer and the coil but before it combines with the counter propagating lightwave. The tapped RIN lightwaves are polarized with pass-axis orientated in the same direction as that of the IOC, so that the RIN detector receives lightwaves with spectrum substantially identical to that of the rate detector, leading to more effective RIN subtraction.

Abstract translation: 有效相对强度噪声（RIN）减法系统和改善去极化陀螺仪的ARW性能的方法。 本发明在光透过去偏振器和线圈之后，然后将其与反向传播的光波组合之前，将感测环中的RIN检测器光抽头。 敲击的RIN光波被以与IOC相同的方向定向的通轴进行极化，使得RIN检测器接收光谱，其光谱与速率检测器的光谱基本相同，导致更有效的RIN减法。

公开(公告)号：US06442311B1

公开(公告)日：2002-08-27

申请号：US09350205

申请日：1999-07-09

Applicant: Giovanni Barbarossa ,  Chellappan Narayanan

Inventor： Giovanni Barbarossa ,  Chellappan Narayanan

IPC: G02B634

CPC classification number: G02B6/13 ,  G02B6/105 ,  G02B2006/12171

Abstract: Transmission characteristics of an optical device 200, fabricated from multiple layers 16, 27, 28 of silica-based glass on a silicon substrate 26, are modified by localized thermal treatment. The beam 501 of a carbon-dioxide (CO2) laser 510 is used to selectively soften the core and/or cladding material of a waveguide structure during or after the fabrication process. In one application, softening relieves the strain developed between the waveguide structure and the silicon substrate and substantially reduces or eliminates birefringence. In a second application, the CO2 laser is operated at another power level in order to modify the index of refraction. Changes in the index of refraction change the speed of light through a waveguide thereby changing the phase shift associated with the waveguide. In a third application, the CO2 laser is operated at yet another power level to increase the transmission loss of the waveguide. In all of the embodiments, heat treatment is substantially faster and/or less expensive than known techniques for modifying the transmission characteristics of an optical device.

Abstract translation: 通过局部热处理改变在硅衬底26上由二氧化硅基玻璃的多层16,27,28制成的光学器件200的透射特性。 二氧化碳（CO2）激光器510的光束501用于在制造过程中或之后选择性地软化波导结构的芯和/或包层材料。 在一个应用中，软化消除了在波导结构和硅衬底之间产生的应变，并且基本上减少或消除了双折射。 在第二个应用中，CO2激光器在另一个功率电平下工作，以便改变折射率。 折射率的变化通过波导改变光的速度，从而改变与波导相关的相移。 在第三个应用中，CO2激光器在另一功率电平下操作以增加波导的传输损耗。 在所有实施例中，热处理比用于修改光学器件的传输特性的已知技术快得多和/或更便宜。

公开(公告)号：US6055976A

公开(公告)日：2000-05-02

申请号：US15464

申请日：1998-01-29

Applicant: Scott Thomas Davies ,  Francis M. Mess ,  Chellappan Narayanan

Inventor： Scott Thomas Davies ,  Francis M. Mess ,  Chellappan Narayanan

IPC: H01L21/301 ,  B23D61/10 ,  B28D5/02 ,  G02B6/122 ,  B28D1/04

CPC classification number: B23D61/10 ,  B28D5/022

Abstract: A method for preparing operative end faces of integrated circuit chips or dies utilizes a beveled cutting blade to impart a desired contact angle to the operative end faces of the chip. The method includes the steps of mounting feet on the chip, trimming the feet where necessary, mounting the chip on a fixture with tape, cutting the end faces, and removing the chip from the fixture.

Abstract translation: 用于制备集成电路芯片或模具的操作端面的方法使用斜切的切割刀片来对芯片的操作端面施加期望的接触角。 该方法包括以下步骤：将脚安装在芯片上，在必要时修剪脚，将芯片安装在具有带子的夹具上，切割端面，以及将芯片从夹具中移出。

公开(公告)号：US5796906A

公开(公告)日：1998-08-18

申请号：US704341

申请日：1996-08-27

Applicant: Chellappan Narayanan ,  Herman Melvin Presby

Inventor： Chellappan Narayanan ,  Herman Melvin Presby

IPC: G02B6/00 ,  G02B6/12 ,  G02B6/124 ,  G02B6/10

CPC classification number: G02B6/124 ,  G02B6/12007 ,  G02B2006/12107 ,  G02B2006/12109

Abstract: An optical planar waveguide notch filter employs a waveguide with first, second and third regions. The first and third regions have structures for propagating an optical signal in a first transmission mode. The second region is located between the first and third regions and has a structure in which an optical signal propagates in the first transmission mode as well as at least one other higher order transmission mode. The structure of the second region further couples a particular wavelength band of the signal propagating in the first transmission mode to at least one of the other transmission modes. This coupling causes an attenuation of energy of such bandwidth in the signal propagating in the first transmission mode. As a result, the signal propagating from the second region to the third region in the first transmission mode is a notch filtered signal possessing an attenuation at the particular wavelength band.

Abstract translation: 光学平面波导陷波滤波器采用具有第一，第二和第三区域的波导。 第一和第三区域具有用于在第一传输模式下传播光信号的结构。 第二区域位于第一和第三区域之间，并且具有其中光信号以第一传输模式以及至少一个其它更高阶传输模式传播的结构。 第二区域的结构还将在第一传输模式中传播的信号的特定波长带耦合到其它传输模式中的至少一个。 该耦合导致在第一传输模式中传播的信号中这种带宽的能量衰减。 结果，在第一传输模式中从第二区域传播到第三区域的信号是在特定波段具有衰减的陷波滤波信号。

公开(公告)号：US5768457A

公开(公告)日：1998-06-16

申请号：US565527

申请日：1995-11-30

Applicant: Chellappan Narayanan ,  Herman Melvin Presby

Inventor： Chellappan Narayanan ,  Herman Melvin Presby

IPC: G02B6/26

CPC classification number: G02B6/30 ,  G02B6/12004

Abstract: In many assembly applications of optical arrays, a bridging member is bonded to the arrays to hold them securely. It has been found that a pad made of layers of glass and silicon provides an efficient heat transmitting structure for this purpose. Because glass is absorbent to laser radiation at 10.6 .mu.m, it absorbs all the incident laser radiation, and imparts the heat generated to the silicon, which transmits it uniformly over its entire surface. The heat can then be used to melt solder or to heat-cure an adhesive, thereby affecting a robust mechanical bond in an efficient and rapid manner.

Abstract translation: 在光学阵列的许多组装应用中，将桥接构件结合到阵列以牢固地保持它们。 已经发现，为了这个目的，由玻璃和硅层制成的垫片提供了有效的传热结构。 因为玻璃吸收到10.6μm的激光辐射，它吸收所有入射的激光辐射，并且将产生的热量传递给硅，其在其整个表面上均匀地传播。 然后可以使用热量来熔化焊料或热固化粘合剂，从而以有效和快速的方式影响牢固的机械粘合。

公开(公告)号：US20080116361A1

公开(公告)日：2008-05-22

申请号：US11600386

申请日：2006-11-16

Applicant: Glen A. Sanders ,  Chellappan Narayanan

Inventor： Glen A. Sanders ,  Chellappan Narayanan

IPC: G01N21/75

CPC classification number: G01N21/7746 ,  G01D5/35345 ,  G01N2021/7716 ,  G01N2201/0612 ,  G01N2201/088 ,  G02B6/2934

Abstract: Apparatus and method are provided for chemical and biological agent sensing. The sensing apparatus includes a resonator having a resonance frequency and one or more optical fiber coils. The optical fiber coil has a permeable cladding and an indicator embedded in the cladding that reacts to an agent (e.g., a chemical or biological substance). The resonator circulates light through the coil and produces a resonance shape centered at the resonance frequency and measured via the input light. A predetermined change in the resonance shape indicates a presence of the agent in the environment.

Abstract translation: 提供了用于化学和生物试剂感测的装置和方法。 感测装置包括具有共振频率的谐振器和一个或多个光纤线圈。 光纤线圈具有可渗透的包层和嵌入包层中的与试剂（例如化学或生物物质）反应的指示剂。 谐振器通过线圈循环光，并产生以谐振频率为中心的谐振形状，并通过输入光测量。 共振形状的预定变化表示在环境中存在该试剂。

公开(公告)号：US5980120A

公开(公告)日：1999-11-09

申请号：US936416

申请日：1997-09-25

Applicant: Chellappan Narayanan

Inventor： Chellappan Narayanan

IPC: G01M11/00 ,  G02B6/36 ,  G02B6/38

CPC classification number: G01M11/333 ,  G02B6/3807 ,  G02B6/3839 ,  G02B6/3636 ,  G02B6/3652

Abstract: Disclosed is an apparatus for testing an array of optical fibers. According to the invention, modulated light is projected through individual fibers of a fiber array onto a photo-sensitive position sensor. The photo-sensitive sensor will provide position information relative to the position of the light projected upon its surface to a system computer. The positions of the optical fibers within the array relative to each other may thus be found. A loop is introduced into the optical fibers to lower the wavelength at which the fiber is multi-moded. The actual positions of the optical fibers are compared to desired positions and the fiber array is accepted or rejected based on whether it meets predetermined limits.

Abstract translation: 公开了一种用于测试光纤阵列的装置。 根据本发明，调制光通过光纤阵列的各个纤维投影到感光位置传感器上。 光敏传感器将提供相对于在其表面上投射到系统计算机的光的位置的位置信息。 因此可以发现阵列内的光纤相对于彼此的位置。 将光纤引入到光纤中以降低光纤多模的波长。 将光纤的实际位置与期望的位置进行比较，并且基于其是否满足预定限度来接受或拒绝光纤阵列。