公开(公告)号：US07885117B2

公开(公告)日：2011-02-08

申请号：US12419576

申请日：2009-04-07

申请人： Chang-Hee Shin ,  Ki-Seok Cho ,  Si-Hyung Cho

发明人： Chang-Hee Shin ,  Ki-Seok Cho ,  Si-Hyung Cho

IPC分类号： G11C16/04

CPC分类号： G11C17/18 ,  G11C17/16

摘要： Disclosed is a method for programming a nonvolatile memory device including one time programmable unit cells. The method for programming a nonvolatile memory device including one time programmable (OTP) unit cells, the method comprising applying a pulse type program voltage having a plurality of cycles. The present invention relates to a method for programming a nonvolatile memory device, which can prevent malfunctions by enhancing a data sensing margin in a read operation through the normal dielectric breakdown of an antifuse during a program operation, and thus improve the reliability in the read operation of an OTP unit cell.

摘要翻译： 公开了一种用于编程包括一个可编程单位单元的非易失性存储器件的方法。 一种用于编程包括一次可编程（OTP）单元单元的非易失性存储器件的方法，所述方法包括应用具有多个周期的脉冲型编程电压。 非易失性存储器件的编程方法技术领域本发明涉及一种非易失性存储器件的编程方法，其可以通过在编程操作期间通过反熔丝的正常介质击穿来增强读操作中的数据检测余量来防止故障，从而提高读操作的可靠性 的OTP单元。

公开(公告)号：US06721089B1

公开(公告)日：2004-04-13

申请号：US10002928

申请日：2001-11-04

申请人： Donald J. Miller ,  John Brownlee ,  Jun Bao ,  Si Hyung Cho

发明人： Donald J. Miller ,  John Brownlee ,  Jun Bao ,  Si Hyung Cho

IPC分类号： H01S300

CPC分类号： H01S3/06754 ,  H01S3/094003

摘要： The dynamic range of an optical amplifier is extended by the addition of a power control circuit. A switch is interposed between a current source and an optical pump supplying pumping light to the gain medium of the optical amplifier. A modulated signal such as a pulse-width modulated signal is used to actuate the switch and control a relative duration of the “on” and “off” periods of the electrical current supplied to the optical pump. Gain latency in the optical amplifier permits a substantially continuous signal to be output from the optical amplifier in response to the switched electrical current supply to the optical pump. A controller may used a feedback signal from the optical pump or from a power monitoring device to control the modulator and, thereby, the switch. A target pump power level, target gain or target amplified signal power level may also be applied in a feedback control loop that controls the modulator and switch. The invention also takes the form of a method that may be used to control a conventional optical amplifier in order to expand the dynamic range, particularly in the low power region.

摘要翻译： 通过添加功率控制电路来扩展光放大器的动态范围。 开关被插入到电流源和向所述光放大器的增益介质提供泵浦光的光泵之间。 使用诸如脉冲宽度调制信号的调制信号来驱动开关并控制提供给光泵的电流的“接通”和“关闭”周期的相对持续时间。 光放大器中的增益延迟允许响应于对光泵的开关电流供应，从光放大器输出基本连续的信号。 控制器可以使用来自光泵或来自功率监控装置的反馈信号来控制调制器，从而控制开关。 目标泵功率电平，目标增益或目标放大信号功率电平也可以应用于控制调制器和开关的反馈控制环路中。 本发明还采用可以用于控制常规光放大器以便扩大动态范围的方法的形式，特别是在低功率区域。

公开(公告)号：US06552358B2

公开(公告)日：2003-04-22

申请号：US10165825

申请日：2002-06-08

申请人： Si Hyung Cho ,  William C. Dautremont-Smith ,  Sun-Yuan Huang

发明人： Si Hyung Cho ,  William C. Dautremont-Smith ,  Sun-Yuan Huang

IPC分类号： H01L3300

CPC分类号： H01S5/227 ,  H01S5/0655 ,  H01S5/2036 ,  H01S5/2218

摘要： A semiconductor laser having a single transverse mode operation. Optical power higher than that generated by conventional pump lasers is achieved by widening the gain medium without inducing the second transverse mode. This is accomplished by providing a small refractive index difference between active and blocking regions of the laser. The refractive index difference between the laser active region material and the laser blocking region material at the fundamental frequency is less than about 0.029.

公开(公告)号：US06525870B1

公开(公告)日：2003-02-25

申请号：US09916075

申请日：2001-07-26

申请人： Si Hyung Cho ,  Jon Tsou ,  Jun Bao ,  Balakrishnan Sridhar

发明人： Si Hyung Cho ,  Jon Tsou ,  Jun Bao ,  Balakrishnan Sridhar

IPC分类号： H01S300

CPC分类号： H01S3/302 ,  H01S3/094003 ,  H01S3/094096 ,  H01S3/1312 ,  H01S5/0612 ,  H01S5/146 ,  H01S2301/04

摘要： An exemplary embodiment of the invention is a Raman amplifier for use in an optical communications network. The Raman amplifier includes a plurality of pump lasers and a plurality of wavelength control modules, each associated with one of the pump lasers. Each wavelength control module includes a fiber Bragg grating optically coupled to a respective one of the plurality of pump lasers. The fiber Bragg grating receives a pump laser output from one of the pump lasers and generates a wavelength control module output. A temperature sensor is in thermal contact with the fiber Bragg grating and generates a temperature signal indicative of a temperature of the fiber Bragg grating. A controller is operatively connected to the temperature sensor and generates a control signal in response to the temperature signal. A thermal regulator is in thermal contact with the fiber Bragg grating and adjusts the temperature of the fiber Bragg grating in response to the control signal. The controller adjusts the temperature of the fiber Bragg grating to reduce sensitivity of Raman gain flatness to variation in a wavelength of the pump laser output.

摘要翻译： 本发明的示例性实施例是用于光通信网络的拉曼放大器。 拉曼放大器包括多个泵激光器和多个波长控制模块，每个波长控制模块与泵激光器之一相关联。 每个波长控制模块包括光学耦合到多个泵浦激光器中的相应一个的光纤布拉格光栅。 光纤布拉格光栅从其中一个泵浦激光器接收泵浦激光输出并产生波长控制模块输出。 温度传感器与光纤布拉格光栅热接触，并产生指示光纤布拉格光栅的温度的温度信号。 控制器可操作地连接到温度传感器并响应于温度信号产生控制信号。 热调节器与光纤布拉格光栅热接触，并根据控制信号调节光纤布拉格光栅的温度。 控制器调节光纤布拉格光栅的温度，以降低拉曼增益平坦度对泵浦激光输出波长变化的灵敏度。

公开(公告)号：US20090198222A1

公开(公告)日：2009-08-06

申请号：US12055920

申请日：2008-03-26

申请人： Si Hyung Cho

发明人： Si Hyung Cho

IPC分类号： A61B18/20

CPC分类号： A61B18/203 ,  A61B2018/00452 ,  A61B2018/00458

摘要： Provided is a dermal scar treatment equipment. The treatment equipment includes a pad, a plurality of pins, and an insulating layer. The pad electrically connects with a high frequency generator. The pins are protrusively coupled to a front of the pad, are inserted into collagen fibers in the dermis through the epidermis, and propagate a high frequency to the collagen fibers. The insulating layer is coated on an end of each of the pins and isolates the pins from the epidermis for no contact.

摘要翻译： 提供真皮疤痕治疗设备。 处理设备包括垫，多个销和绝缘层。 该垫与高频发生器电连接。 销突出地联接到垫的前部，通过表皮插入到真皮中的胶原纤维中，并且高频率传播到胶原纤维。 绝缘层涂覆在每个销的端部上，并将引脚与表皮隔离以不接触。

公开(公告)号：US06965622B1

公开(公告)日：2005-11-15

申请号：US10353242

申请日：2003-01-28

申请人： Si Hyung Cho ,  Ilya Lyubomirsky ,  Doyle Nichols ,  Gerald McAdoo ,  Larry Davis

发明人： Si Hyung Cho ,  Ilya Lyubomirsky ,  Doyle Nichols ,  Gerald McAdoo ,  Larry Davis

IPC分类号： H01S3/00 ,  H01S5/06 ,  H01S5/0687 ,  H01S5/12 ,  H04B10/155

CPC分类号： H04B10/572 ,  H01S5/0612 ,  H01S5/0687 ,  H01S5/12

摘要： The present invention is directed toward a laser wavelength locking scheme suitable for incorporation into WDM systems having channel spacings of 25 GHz or less. In a preferred embodiment, light output from the laser is supplied to a filtering element, such as an in-fiber Bragg grating or an etalon, and photodetectors are used to sense light transmitted through and either reflected by the filtering element or input to the filtering element. A measured ratio corresponding to a quotient of the photocurrents generated by the photodetectors is calculated and compared to a desired ratio corresponding to a measured temperature of the filtering element when the filtering element transmits the desired wavelength to be locked. Based on the comparison of the desired and measured ratios, a temperature error value is calculated which is used to adjust the laser temperature, as well as the laser wavelength. Accordingly, the temperature of the filtering element, for example, influences the laser temperature, so that wavelength variations stemming from temperature induced changes in the filtering element and other components in the laser package can be compensated, and the output wavelength can remain substantially fixed.

摘要翻译： 本发明涉及一种适用于掺入具有25GHz或更小的信道间隔的WDM系统的激光波长锁定方案。 在优选实施例中，从激光器输出的光被提供给诸如光纤内布拉格光栅或标准具的滤波元件，并且光电探测器用于感测透过的光，并且由滤光元件反射的光或者滤波器的输入 元件。 计算对应于由光电探测器产生的光电流的商的测量比，并将其与当滤波元件透过要锁定的期望波长时对应于滤波元件的测量温度的期望比率进行比较。 根据所需和比率的比较，计算用于调节激光温度以及激光波长的温度误差值。 因此，过滤元件的温度例如影响激光温度，从而可以补偿源自激光器封装中的过滤元件和其它部件的温度引起的变化引起的波长变化，并且输出波长可以保持基本上固定。

公开(公告)号：US06503768B2

公开(公告)日：2003-01-07

申请号：US09821212

申请日：2001-03-29

申请人： Si Hyung Cho ,  Ronald E. Leibenguth ,  Abdallah Ougazzaden ,  Claude L. Reynolds

发明人： Si Hyung Cho ,  Ronald E. Leibenguth ,  Abdallah Ougazzaden ,  Claude L. Reynolds

IPC分类号： H01L2100

CPC分类号： H01S5/026 ,  H01S5/0265 ,  H01S5/4031 ,  H01S5/50

摘要： The present invention provides a method for monolithic integration of multiple devices on an optoelectronic substrate. The method, in a preferred embodiment, includes forming an active layer having a given wavelength over a substrate. The method further includes forming an N-type doped layer over a portion of the active layer to form first and second active regions within the active layer, the first active region having the given wavelength and the second active region having an altered wavelength different from the given wavelength. In one exemplary embodiment, the conditions used to form the N-type doped layer, for example, dopant concentration, growth rate and temperature, cause the difference in wavelength between the given wavelength and the altered wavelength.

摘要翻译： 本发明提供了一种用于在光电子衬底上单个集成多个器件的方法。 在优选实施例中，该方法包括在衬底上形成具有给定波长的有源层。 该方法还包括在有源层的一部分上形成N型掺杂层，以在有源层内形成第一和第二有源区，第一有源区具有给定的波长，而第二有源区具有不同于 给定波长。 在一个示例性实施例中，用于形成N型掺杂层的条件，例如掺杂剂浓度，生长速率和温度，引起给定波长和改变波长之间的波长差异。

公开(公告)号：US20050180749A1

公开(公告)日：2005-08-18

申请号：US10981572

申请日：2004-11-05

申请人： Bikash Koley ,  Si-Hyung Cho

发明人： Bikash Koley ,  Si-Hyung Cho

IPC分类号： H04J14/00 ,  H04J14/02 ,  H04Q11/00

CPC分类号： H04J14/0294 ,  H04J14/0227 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0283 ,  H04J14/0284 ,  H04Q11/0066 ,  H04Q2011/0081

摘要： A system and method is provided for operating a node in an optical Ethernet network system, comprising: generating optical signals of at least one wavelength corresponding to the node; transmitting the optical signals on each of the first and second optical fiber paths; receiving optical signals of the at least one wavelength, either directly or indirectly, from the first and second optical fiber paths; and selectively choosing signals from, either directly or indirectly, either the first or second optical fiber paths depending on the optical signals received from the first or second optical fiber path.

摘要翻译： 提供了一种用于操作光以太网网络系统中的节点的系统和方法，包括：产生对应于该节点的至少一个波长的光信号; 在所述第一和第二光纤路径中的每一个上传送光信号; 从所述第一和第二光纤路径直接或间接接收所述至少一个波长的光信号; 以及根据从第一或第二光纤路径接收的光信号，直接或间接选择第一或第二光纤路径的信号。

公开(公告)号：US06635502B1

公开(公告)日：2003-10-21

申请号：US09741358

申请日：2000-12-20

申请人： Si Hyung Cho ,  William Crossley Dautremont-Smith ,  Sun-Yuan Huang ,  Charles H Joyner ,  Ronald Eugene Leibenguth ,  Abdallah Ougazzaden ,  Claude Lewis Reynolds, Jr.

发明人： Si Hyung Cho ,  William Crossley Dautremont-Smith ,  Sun-Yuan Huang ,  Charles H Joyner ,  Ronald Eugene Leibenguth ,  Abdallah Ougazzaden ,  Claude Lewis Reynolds, Jr.

IPC分类号： H01L2100

CPC分类号： B82Y20/00 ,  H01S5/2059 ,  H01S5/2218 ,  H01S5/227 ,  H01S5/2275 ,  H01S5/3434

摘要： The invention is a semiconductor optical device and method of fabrication where the device includes an active region with an active layer having a first index of refraction, and a blocking region having a second, lower index of refraction. A semiconductor layer having an index of refraction higher than the blocking region is formed over both the active and blocking regions so that the semiconductor layer is in closer proximity to the active layer in areas not covered by the blocking region so as to decrease the difference between the effective index of refraction in the active region and the effective refractive index of the blocking region. Such devices are particularly useful for pumping optical amplifiers since greater power can be achieved while maintaining single mode emission.

摘要翻译： 本发明是一种半导体光学器件及其制造方法，其中器件包括具有第一折射率的有源层的有源区和具有第二较低折射率的阻挡区。 在有源屏蔽区域和阻挡区域之间形成具有高于阻挡区域的折射率的半导体层，使得半导体层在未被阻挡区域覆盖的区域中更靠近有源层，以便减小区域之间的差异 有效区域中的有效折射率和阻挡区域的有效折射率。 这样的器件对于泵浦光放大器特别有用，因为可以在保持单模发射的同时实现更大的功率。

公开(公告)号：US06567446B1

公开(公告)日：2003-05-20

申请号：US09640289

申请日：2000-08-16

申请人： Sun-Yuan Huang ,  Kenneth L. Bacher ,  Si Hyung Cho ,  William Crossley Dautremont-Smith

发明人： Sun-Yuan Huang ,  Kenneth L. Bacher ,  Si Hyung Cho ,  William Crossley Dautremont-Smith

IPC分类号： H01S500

CPC分类号： H01S5/12 ,  H01S5/1064 ,  H01S5/2275

摘要： The invention is an optical apparatus and method of fabrication wherein an optical device such as a semiconductor laser includes a grating and a waveguide optically coupled to the grating. At least a portion of the waveguide coupled to the grating has a width which varies along the length of the waveguide in such a manner as to broaden the spectral line width of light output from the device. The width can be varied according to linear, sinusoidal or saw-tooth functions. A broadened line width permits pumping of a Raman amplifier at a high power without inducing any significant Brillouin Scattering.

摘要翻译： 本发明是一种光学装置和制造方法，其中诸如半导体激光器的光学装置包括光栅和光学耦合到光栅的波导。 耦合到光栅的波导的至少一部分具有沿着波导长度变化的宽度，以便扩大从该器件输出的光的谱线宽度。 宽度可以根据线性，正弦曲线或锯齿功能而变化。 扩大的线宽允许以高功率泵浦拉曼放大器，而不会引起任何显着的布里渊散射。