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    • 53. 发明授权
    • Direct digital access arrangement circuitry and method for connecting to phone lines
    • 用于连接到电话线的直接数字接入安排电路和方法
    • US07463675B2
    • 2008-12-09
    • US11398090
    • 2006-04-05
    • Jeffrey W. ScottNavdeep S. SoochDavid R. Welland
    • Jeffrey W. ScottNavdeep S. SoochDavid R. Welland
    • H04B1/38H04L5/16
    • H04M1/573H04L7/033H04L25/0266H04L25/06H04M1/76H04M3/007H04M11/06H04M19/001H04M19/02
    • An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.
    • 提供了一种适用于电话,医疗仪器,工业过程控制和其他应用的隔离系统。 本发明的优选实施例包括电容隔离屏障,通过数字信号传送数字信号。 该系统提供跨越隔离屏障的通信手段,其高度免疫幅度和相位噪声干扰。 可以在隔离屏障的一侧采用时钟恢复电路,从跨屏障通信的数字信号提取定时信息,并且滤除在屏障处引入的相位噪声的影响。 Δ-Σ转换器可以设置在隔离屏障的两侧以在模拟和数字域之间转换信号。 隔离电源也可以设置在屏障的隔离侧上,由此响应于穿过隔离屏障接收的数字数据产生直流电流。 最后,提供双向隔离系统,由此使用单对隔离电容器实现数字信号的双向通信。 在优选实施例中,跨屏障通信的数字数据由与其他数字控制,信令和成帧信息在时间上多路复用的数字delta-sigma数据信号组成。
    • 57. 发明授权
    • Encapsulated optoelectronic devices with controlled properties
    • 具有受控特性的封装光电器件
    • US06845118B1
    • 2005-01-18
    • US09535629
    • 2000-03-24
    • Jeffrey W. Scott
    • Jeffrey W. Scott
    • H01L33/10H01L33/44H01L33/46H01S5/00H01S5/02H01S5/022H01S5/028H01S5/183H01S3/08
    • H01L33/44H01L33/105H01L33/465H01L2224/48091H01S5/0042H01S5/0201H01S5/02228H01S5/02284H01S5/02296H01S5/0264H01S5/18369H01S5/18377H01S5/18391H01L2924/00014
    • An optoelectronic device, such as a VCSEL, is disclosed whose transmission does not change upon encapsulation by a material such as plastic, epoxy or other suitable encapsulant with a known index of refraction. The surface reflection of the VCSEL surface is very different depending on whether it is terminated in air or the encapsulant, with a much larger reflection in the case of air. It is known that the surface reflection can be made out of phase with the rest of the mirror, effectively increasing the transmission. The amount of the transmission increase can be adjusted by controlling the thickness of the surface layer. Once the VCSEL is encapsulated, the surface reflection is reduced, and the transmission at the facet is increased but the dephased reflection is also reduced. Depositing a surface layer whose index of refraction is similar to the encapsulant, and adjusting the surface layer thickness correctly, the overall transmission from the laser into the terminating material is unchanged, be it air or encapsulation. As a result, the laser properties such as slope efficiency and threshold current are unchanged upon encapsulation. The same procedure may be applied to devices other than VCSELs such as other types of lasers, LEDs, and resonant cavity photodetectors to achieve encapsulated optoelectronic components with controlled properties that remain unchanged upon encapsulation.
    • 公开了一种诸如VCSEL的光电子器件,其透射率通过诸如塑料,环氧树脂或具有已知折射率的其它合适的密封剂的材料进行封装时不发生变化。 VCSEL表面的表面反射是非常不同的,这取决于它是否在空气或密封剂中终止,在空气的情况下反射更大。 已知表面反射可以与反射镜的其余部分不同相,有效地增加了透射率。 可以通过控制表面层的厚度来调节透射增加量。 一旦VCSEL被封装,则表面反射减小,并且小面处的透射增加,而反相反射也减小。 沉积折射率类似于密封剂的表面层,并且正确地调节表面层厚度,从激光器到终端材料的总体传输是不变的,无论是空气还是封装。 结果,在封装时,诸如斜率效率和阈值电流的激光特性不变。 对VCSELs以外的器件,例如其它类型的激光器,LED和谐振腔光电探测器也可以采用相同的步骤,以实现封装的光电元件,其具有在封装时保持不变的受控特性。
    • 58. 发明授权
    • Closely-spaced VCSEL and photodetector for applications requiring their independent operation
    • 紧密间隔的VCSEL和光电检测器,可用于需要独立操作的应用
    • US06835992B1
    • 2004-12-28
    • US09484348
    • 2000-01-18
    • Stanley E. SwirhunJeffrey W. Scott
    • Stanley E. SwirhunJeffrey W. Scott
    • H01L3106
    • H01S5/0264H01S5/02208H01S5/02244H01S5/02248H01S5/02284H01S5/0262H01S5/06226H01S5/183H01S5/18388Y10S148/095Y10S148/128
    • A monolthically integrated VCSEL and photodetector, and a method of manufacturing same, are disclosed for applications where the VCSEL and photodetector require separate operation such as duplex serial data communications applications. A first embodiment integrates a VCSEL with an MSM photodetector on a semi-insulating substrate. A second embodiment builds the layers of a p-i-n photodiode on top of layers forming a VCSEL using a standard VCSEL process. The p-i-n layers are etched away in areas where VCSELs are to be formed and left where the photodetectors are to be formed. The VCSELs underlying the photodetectors are inoperable, and serve to recirculate photons back into the photodetector not initially absorbed. The transmit and receive pairs are packaged in a single package for interface to multifiber ferrules. The distance between the devices is precisely defined photolithographically, thereby making alignment easier.
    • 公开了一种单分布式VCSEL和光电检测器及其制造方法,其中VCSEL和光电探测器需要单独的操作,例如双工串行数据通信应用。 第一实施例将VCSEL与半绝缘衬底上的MSM光电检测器集成。 第二实施例使用标准VCSEL工艺在形成VCSEL的层的顶部上构建p-i-n光电二极管的层。 在要形成VCSEL的区域中蚀刻掉p-i-n层,并留在要形成光电探测器的位置。 光电探测器下面的VCSEL是不可操作的,并且用于将光子再循环回到初始被吸收的光电探测器中。 发送和接收对被封装在单个封装中,用于与多光纤套圈的接口。 设备之间的距离是光刻的精确定义,从而使对准更容易。