公开(公告)号：US07249881B2

公开(公告)日：2007-07-31

申请号：US11119093

申请日：2005-04-29

Applicant: Kevin P. Pipe ,  Rajeev J. Ram

Inventor： Kevin P. Pipe ,  Rajeev J. Ram

IPC: G01N25/20 ,  G01K3/00

CPC classification number: G01K3/00 ,  G01N25/18

Abstract: A method and apparatus for performing characterization of devices is presented. The characteristic of the device are determined by obtaining a first temperature measurement in a first location of a device, obtaining a second temperature measurement, computing the difference between the temperature measurements and, using the temperatures and/or the temperature difference, a characteristic of the device is determined.

Abstract translation: 提出了一种用于执行设备表征的方法和装置。 通过在器件的第一位置获得第一温度测量值，获得第二温度测量值，计算温度测量值之间的差值，并使用温度和/或温度差异来确定器件的特性来确定器件的特性 设备确定。

公开(公告)号：US07130494B2

公开(公告)日：2006-10-31

申请号：US10748358

申请日：2003-12-30

Applicant: Rajeev J. Ram ,  Tauhid Zaman ,  Xiaoyun Guo

Inventor： Rajeev J. Ram ,  Tauhid Zaman ,  Xiaoyun Guo

IPC: G02F1/295 ,  H01L21/00

CPC classification number: G02F1/0955 ,  G02B6/2746 ,  G02B2006/12157 ,  G02F1/0036 ,  G02F2202/101 ,  G02F2202/102 ,  G02F2203/15

Abstract: A magneto-optical device includes a waveguide structure that has at least one cladding region and core region. The cladding region and core region comprise semiconductor alloy materials. Either the at least one cladding region or the core region is doped with ferromagnetic materials so as to increase the magneto-optical activity of the device.

Abstract translation: 磁光装置包括具有至少一个包层区域和芯区域的波导结构。 包层区域和芯区域包括半导体合金材料。 所述至少一个包覆区域或芯区域中的任一个都掺杂有铁磁材料，以增加该器件的磁光活性。

公开(公告)号：US20190195688A1

公开(公告)日：2019-06-27

申请号：US16229355

申请日：2018-12-21

Applicant: Amir H. Atabaki ,  Rajeev J. RAM ,  William F. Herrington

Inventor： Amir H. Atabaki ,  Rajeev J. RAM ,  William F. Herrington

IPC: G01J3/02 ,  G01J3/10 ,  G01J3/28 ,  G01J3/44 ,  G01N21/65 ,  G01J3/18

CPC classification number: G01J3/0229 ,  G01J3/10 ,  G01J3/18 ,  G01J3/2803 ,  G01J3/44 ,  G01N21/65 ,  G01N2201/06113 ,  G01N2201/0635 ,  G01N2201/0638

Abstract: In swept source Raman (SSR) spectroscopy, a swept laser beam illuminates a sample, which inelastically scatters some of the incident light. This inelastically scattered light is shifted in wavelength by an amount called the Raman shift. The Raman-shifted light can be measured with a fixed spectrally selective filter and a detector. The Raman spectrum can be obtained by sweeping the wavelength of the excitation source and, therefore, the Raman shift. The resolution of the Raman spectrum is determined by the filter bandwidth and the frequency resolution of the swept source. An SSR spectrometer can be smaller, more sensitive, and less expensive than a conventional Raman spectrometer because it uses a tunable laser and a fixed filter instead of free-space propagation for spectral separation. Its sensitivity depends on the size of the collection optics. And it can use a nonlinearly swept laser beam thanks to a wavemeter that measures the beam's absolute wavelength during Raman spectrum acquisition.

公开(公告)号：US20090245322A1

公开(公告)日：2009-10-01

申请号：US12115201

申请日：2008-05-05

Applicant: Janice A. Hudgings ,  Rajeev J. Ram ,  Maryam Farzaneh

Inventor： Janice A. Hudgings ,  Rajeev J. Ram ,  Maryam Farzaneh

IPC: G01N25/00

CPC classification number: G01K11/125

Abstract: In one aspect, the present invention provides techniques and apparatus for optical characterization of photonic devices and/or circuits. By way of example, the techniques can be used to identify damaged devices in photonic integrated circuits. In some embodiments, thermal imaging is employed as a diagnostic tool for characterizing the devices/circuits under investigation. For example, in one embodiment, integrated cascaded semiconductor amplifiers can be characterized using amplified spontaneous emission from one amplifier as a thermal modulation input to another amplifier. A thermoreflectance image of the second amplifier can reveal flaws, if present. Further, in some embodiments, thermal imaging in conjunction with a total energy model can be employed to characterize the elements of photonic circuits optically and/or to map the optical power distribution throughout the circuits.

Abstract translation: 一方面，本发明提供了用于光子器件和/或电路的光学表征的技术和装置。 作为示例，这些技术可用于识别光子集成电路中的损坏设备。 在一些实施例中，热成像被用作诊断工具，用于表征所研究的装置/电路。 例如，在一个实施例中，可以使用来自一个放大器的放大的自发发射作为热调制输入到另一个放大器来表征集成级联半导体放大器。 第二放大器的反射反射图像可以显示缺陷（如果存在）。 此外，在一些实施例中，可以采用结合总能量模型的热成像来光学地表征光子电路的元件和/或映射整个电路中的光功率分布。

公开(公告)号：US06426831B1

公开(公告)日：2002-07-30

申请号：US09552914

申请日：2000-04-20

Applicant: Holger Schmidt ,  Rajeev J. Ram

Inventor： Holger Schmidt ,  Rajeev J. Ram

IPC: G02F135

CPC classification number: G02F2/004

Abstract: A wavelength division multiplexing (WDM) optical communication system includes an EIT based wavelength converter/switch. EIT, i.e., electromagnetically induced transparency, refers to the elimination of resonant absorption on an otherwise optically allowed transition by the application of a coherent coupling light field. In one embodiment, the EIT converter provides a 1×1 converter for converting a data stream from a first wavelength to a second wavelength. A constant wave probe field and a coherent coupling field, which has a state corresponding to data stream, are applied to the EIT medium. The converter can convert the data stream from a wavelength corresponding to the coupling field to the wavelength of the probe field. In a further embodiment, additional pairs of probe and coupling fields are applied to the EIT medium to provide an N×N converter.

Abstract translation: 波分复用（WDM）光通信系统包括基于EIT的波长转换器/开关。 EIT，即电磁感应透明度，是指通过施加相干耦合光场消除光学允许的转换上的谐振吸收。 在一个实施例中，EIT转换器提供1x1转换器，用于将数据流从第一波长转换成第二波长。 具有对应于数据流的状态的恒定波探测场和相干耦合场应用于EIT介质。 转换器可以将来自与耦合场相对应的波长的数据流转换为探测场的波长。 在另一实施例中，附加的探针和耦合场对被应用于EIT介质以提供N×N转换器。