公开(公告)号：US07889107B2

公开(公告)日：2011-02-15

申请号：US12482997

申请日：2009-06-11

Applicant: Ju Han Lee

Inventor： Ju Han Lee

IPC: H03M1/00

CPC classification number: H03M1/74 ,  G02F7/00

Abstract: A digital-to-analog converter (DAC) includes multiple electro-optical converters to generate multiple first optical signals in response to multiple input signals, multiple optical attenuators to attenuate intensities of the first optical signals and to generate multiple second optical signals, an optical coupler to combine the second optical signals and to generate a third optical signal, and a photodetector to convert the third optical signal into an electrical analog signal.

Abstract translation: 数模转换器（DAC）包括多个电光转换器，以响应于多个输入信号产生多个第一光信号，多个光衰减器来衰减第一光信号的强度并产生多个第二光信号，光 耦合器以组合第二光信号并产生第三光信号;以及光电检测器，用于将第三光信号转换为电模拟信号。

公开(公告)号：US08811560B2

公开(公告)日：2014-08-19

申请号：US12981869

申请日：2010-12-30

Applicant: Myung Jun Song ,  Jong Joo Sohn ,  In Ho Song ,  Ju Han Lee ,  Byung Heon Hwang ,  Eun Kee Kim ,  Ung Soo Kim

Inventor： Myung Jun Song ,  Jong Joo Sohn ,  In Ho Song ,  Ju Han Lee ,  Byung Heon Hwang ,  Eun Kee Kim ,  Ung Soo Kim

IPC: G21C7/32

CPC classification number: G21D3/14 ,  F22B35/004 ,  Y02E30/40

Abstract: A system and a method of transforming a gain and an integral time constant of a proportional-integral (PI) controller according to a timer lapse time to relieve an excessive phenomenon of a steam generator level caused by rapid changes in open degrees of a downcomer feed-water valve and an economizer feed-water valve when reactor power transfers between low and high power sections. Accordingly, an excessive phenomenon of a steam generator level is relieved at a transfer time when reactor power transfers between low and high power sections. Therefore, a possibility of a stop of a reactor caused by the excessive phenomenon of the steam generator level is reduced to relieve burden on an operator and improve an operation rate and economic feasibility of a nuclear power plant.

Abstract translation: 根据定时器经过时间来转换比例积分（PI）控制器的增益和积分时间常数的系统和方法，以减轻由降液管进料的开度快速变化引起的蒸汽发生器水平的过度现象 - 在低功率部分和高功率部分之间进行电抗器功率传输时，水阀和节能器给水阀。 因此，在低功率部分和高功率部分之间的电抗器功率传递的转移时刻，蒸汽发生器电平的过度现象得到缓解。 因此，由于蒸汽发生器水平的过度现象而导致的反应堆停止的可能性降低，减轻了操作人员的负担，提高了核电厂的运行率和经济可行性。

公开(公告)号：US07136559B2

公开(公告)日：2006-11-14

申请号：US10490907

申请日：2002-09-27

Applicant: Zulfadzli Yusoff ,  Walter Belardi ,  Peh Chiong Teh ,  Ju Han Lee ,  Tanya Mary Monro ,  David John Richardson

Inventor： Zulfadzli Yusoff ,  Walter Belardi ,  Peh Chiong Teh ,  Ju Han Lee ,  Tanya Mary Monro ,  David John Richardson

IPC: G02B6/032

CPC classification number: G02F1/365 ,  G02F2202/32

Abstract: An optical fibre device based on the Raman effect comprises a first optical source to provide light at a first wavelength, and a holey optical fibre which receives the light from the first optical source such that optical gain or loss is provided at a second wavelength by the effect of Raman scattering within the fibre. For optical gain, the second wavelength is longer than the first wavelength, and the device can be operated as an amplifier, or as a laser if optical feedback is provided. For optical loss, the second wavelength is shorter than the first, and the device may be used as an optical modulator. The fibre may be fabricated from pure silica, although other undoped or doped materials may alternatively be used to tailor properties of the fibre such as gain spectrum, bandwidth, power handling capability and mode propagation.

Abstract translation: 基于拉曼效应的光纤装置包括提供第一波长的光的第一光源和接收来自第一光源的光的多孔光纤，使得在第二波长处提供光增益或损耗， 纤维内拉曼散射的作用。 对于光学增益，第二波长比第一波长长，并且器件可以作为放大器工作，或者如果提供光学反馈则作为激光器。 对于光损耗，第二波长比第一波长短，该器件可以用作光调制器。 纤维可以由纯二氧化硅制成，尽管其它未掺杂或掺杂的材料可以替代地用于定制纤维的性质，例如增益谱，带宽，功率处理能力和模式传播。

公开(公告)号：US08270782B2

公开(公告)日：2012-09-18

申请号：US12695288

申请日：2010-01-28

Applicant: Ju Han Lee

Inventor： Ju Han Lee

IPC: G02B6/00 ,  G01J5/08

CPC classification number: G01L1/242 ,  G01D5/35348 ,  G01K11/32

Abstract: An optical fiber sensor may include an optical fiber configured to receive a light having a first frequency from a light source and to transmit the light through the optical fiber, the transmitted light having the first frequency and a second frequency which is generated by stimulated Brillouin scattering (SBS), a photodetector configured to receive the transmitted light from the optical fiber and to convert the transmitted light into an electric signal and a sensing circuit configured to calculate an average squared value of the electric signal received from the photodetector, which is dependent on a frequency difference between the first frequency and the second frequency.

Abstract translation: 光纤传感器可以包括光纤，其被配置为从光源接收具有第一频率的光并且透射光通过光纤，具有第一频率的透射光和由受激布里渊散射产生的第二频率 （SBS），被配置为接收来自光纤的透射光并且将透射光转换成电信号的光电检测器，以及被配置为计算从光电检测器接收的电信号的平均平方值的感测电路，其依赖于 第一频率和第二频率之间的频率差。

公开(公告)号：US07003180B2

公开(公告)日：2006-02-21

申请号：US10472076

申请日：2002-03-15

Applicant: David John Richardson ,  Ju Han Lee ,  Morten Ibsen ,  Periklis Petropoulos ,  Peh Choing Teh

Inventor： David John Richardson ,  Ju Han Lee ,  Morten Ibsen ,  Periklis Petropoulos ,  Peh Choing Teh

IPC: G02F1/01

CPC classification number: H04B10/2507 ,  G02F1/3515 ,  G02F2201/02 ,  G02F2201/307

Abstract: Apparatus for providing timing jitter tolerant optical modulation of a first signal by a second signal, the first signal having a first wavelength, the second signal including a plurality of second signal pulses having a second pulse shape and a second wavelength. The apparatus includes a first signal input port, a second signal input port, a coupler, a grating and a non-linear optical device. The apparatus is configured to direct the second signal at the second signal input port to the non-linear optical device via the coupler and the grating, and to direct the first signal at the first signal input port to the non-linear optical device. The grating is a superstructured fibre Bragg grating that converts the second signal pulses into intermediary pulses each having an intermediary pulse shape. The intermediary pulse shape is such that it provides a switching window within the non-linear optical device.

Abstract translation: 用于通过第二信号提供对第一信号的定时抖动容忍光调制的装置，所述第一信号具有第一波长，所述第二信号包括具有第二脉冲形状和第二波长的多个第二信号脉冲。 该装置包括第一信号输入端口，第二信号输入端口，耦合器，光栅和非线性光学装置。 该装置被配置为经由耦合器和光栅将第二信号输入端口处的第二信号引导到非线性光学装置，并将第一信号输入端口处的第一信号引导到非线性光学装置。 光栅是将第二信号脉冲转换成具有中间脉冲形状的中间脉冲的超结构光纤布拉格光栅。 中间脉冲形状使得其在非线性光学装置内提供开关窗口。