-
1.发明授权Method of producing a semiconductor laser adapted for use in an analog optical communications system 失效适用于模拟光通信系统的半导体激光器的制造方法
公开(公告)号：US5034334A
公开(公告)日：1991-07-23
申请号：US420867
申请日：1989-10-13
CPC分类号： H01S5/0014 , H01S5/06812 , H01S5/40 , Y10S148/095 , Y10S148/162
摘要： An advantageous method of fabricating lasers adapted for use in a multichannel analog optical fiber communication system, e.g., a CATV system, is disclosed. A laser generally can be used in such a communication system only if it meets, inter alia, very stringent intermodulation specifications. To identify such lasers typically requires extensive testing. It has now been discovered that certain readily determinable parameters can be used to predict the intermodulation behavior of a given device. This discovery makes possible a simpler, and therefore less costly, process of identifying suitable lasers, resulting in a more economical method of making lasers for the stated application. The method comprises measuring the light versus current (L versus I) characteristic of a given laser, determining therefrom the first, second, and possibly higher, order derivatives of L with respect to I, and determining thereform a parameter that is a predictor of the distortion behavior of the laser. Exemplarily, the quantity is the normalized second order distortion (2HD/C), defined as 20 log (mL"/4L'.sup.2), where m is the modulation index, and L' and L" are the first and second derivatives, respectively, of L. 2HD/C has a pronounced minimum at I=I.sub.op , the current at which L"=0. Advantageously, lasers are selected that have 2HD/C less than a predetermined value (e.g., -70 dbc, with m=0.04) over a relatively wide current range (e.g., at least 4 mA).
-
2.发明授权Optical sub-carrier multiplex television transmission system using a linear laser diode 失效光子载波复用电视传输系统采用线性激光二极管
公开(公告)号：US5020049A
公开(公告)日：1991-05-28
申请号：US420849
申请日：1989-10-13
申请人： George E. Bodeep , Thomas E. Darcie , Edward J. Flynn , Jan Lipson , Carl J. McGrath , Charles B. Roxlo , Mark S. Schaefer , L. C. Upadhyayula
发明人： George E. Bodeep , Thomas E. Darcie , Edward J. Flynn , Jan Lipson , Carl J. McGrath , Charles B. Roxlo , Mark S. Schaefer , L. C. Upadhyayula
CPC分类号： H04N7/22 , H01S5/06213 , H04B10/58 , H04J14/0298 , H01S5/0035 , H01S5/227 , H01S5/2275
摘要： An amplitude-modulated vestigial-sideband, television channel sub-carrier multiplexed optical fiber transmission system includes a laser diode operating linearly throughout the desired range of multiplex frequencies. Such linear laser diode operation is accomplished by limiting leakage current within the laser diode to a very low level. The composite second-order distortion in the optical output signal from the laser diode is down typically 50 db from the video carrier for each channel. For some laser diodes that exhibit slow turn-on in the L-I characteristic, there is a point of inflection in the L-I curve. Operation with the laser biased at or near this point results in extremely linear performance, even though the laser may have insufficient blocking of leakage current to otherwise produce acceptable linearity.
摘要翻译： 幅度调制的残留边带，电视频道副载波复用光纤传输系统包括在整个期望的多路复用频率范围内线性地工作的激光二极管。 这种线性激光二极管操作是通过将激光二极管内的泄漏电流限制到非常低的水平来实现的。 来自激光二极管的光输出信号中的复合二阶失真通常为每通道的视频载波降低50db。 对于在L-I特性中呈现缓慢导通的一些激光二极管，在L-I曲线中存在拐点。 激光偏置在此点附近的操作导致非常线性的性能，即使激光器可能没有足够的阻挡泄漏电流，从而产生可接受的线性度。
-
3.发明授权Analog optical fiber communication system, and laser adapted for use in such a system 失效模拟光纤通信系统和适用于这种系统的激光器
公开(公告)号：US5012484A
公开(公告)日：1991-04-30
申请号：US459922
申请日：1990-01-02
IPC分类号： H01S5/028 , H01S5/06 , H01S5/062 , H01S5/0625 , H01S5/10 , H01S5/12 , H04B10/155
CPC分类号： H01S5/12 , H04B10/504 , H04B10/564 , H04B10/58 , H01S5/028 , H01S5/06 , H01S5/06213 , H01S5/06255 , H01S5/06258 , H01S5/10 , H01S5/124 , H01S5/1243
摘要： Lasers for use in multichannel analog optical fiber communication systems (e.g., of the type contemplated for CATV) have to meet very stringent requirements, including high linearity. DFB lasers are advantageously used in such communication systems. Typically only a relatively small percentage of the nominally identical DFB lasers on a wafer meet the specifications. It has now been discovered that the likelihood that a given DFB laser will meet the requirements is substantially increased if the laser comprises means that are adapted for producing a non-uniform photon density in the laser cavity, with the density of photons being larger in the rear portion of the cavity than in the front portion, such that during operation of the laser the gain in the back portion is substantially independent of the laser current, whereas the gain in the front portion is a function of the laser current. Exemplarily, lasers according to the invention have power asymmetry less than about 5. Preferred embodiments are AR/HR lasers with KL in the range 1.6-2.5. Optionally lasers according to the invention have a phase shift located in the back portion of the grating, a split contact, and/or a non-constant mesa width.
-
公开(公告)号：US08067949B2
公开(公告)日：2011-11-29
申请号：US12881070
申请日：2010-09-13
IPC分类号： G01R31/10
CPC分类号： H01S5/0021 , G01R31/2849 , G02B6/4246 , H01S5/02248 , H01S5/22
摘要： Semiconductor lasers are aged to identify weak or flawed devices, resulting in improved reliability of the remaining devices. The lasers can be aged using a high-power optical burn-in that includes providing a high drive current to the lasers for a period of time, and maintaining the ambient temperature of the lasers at a low temperature. After the high-power optical burn-in, the output of the lasers can be measured to determine if the lasers are operating within specifications. Those that are not can be discarded, while those that are can be further aged using a high-temperature thermal burn-in that includes providing a drive current to the lasers while maintaining the ambient temperature of the lasers at a high-temperature.
摘要翻译： 半导体激光器老化以识别弱或有缺陷的器件，从而提高其余器件的可靠性。 激光器可以使用高功率光学老化来老化，其包括向激光器提供高驱动电流一段时间，并且将激光器的环境温度保持在低温。 在高功率光学老化之后，可以测量激光器的输出，以确定激光器是否在规格范围内运行。 那些不能被丢弃的那些，而那些可以使用高温热老化进一步老化，其包括向激光器提供驱动电流，同时将激光器的环境温度保持在高温。
-
公开(公告)号：US07042575B2
公开(公告)日：2006-05-09
申请号：US11128988
申请日：2005-05-13
CPC分类号： G06F3/0317 , G01P3/36 , G01P3/68
摘要： One embodiment relates to an optical displacement sensor for sensing transverse displacement of a data input device relative to a surface by determining displacement of optical features in a succession of frames. The sensor includes at least a coherent light source, illumination optics to illuminate a portion of the surface, imaging optics, and a first array of photosensitive elements having a periodic distance. The illuminator and the detector are configured to produce on the first array of photosensitive elements an intensity pattern of light reflected from the illuminated portion of the surface. The intensity pattern comprises a plurality of speckles having an average speckle diameter which is between one half and two times the periodic distance of the array.
摘要翻译： 一个实施例涉及用于通过确定一连串框架中的光学特征的位移来感测数据输入装置相对于表面的横向位移的光学位移传感器。 传感器至少包括相干光源，用于照亮表面的一部分的照明光学器件，成像光学元件以及具有周期性距离的第一光敏元件阵列。 照明器和检测器被配置为在第一阵列感光元件上产生从表面的照射部分反射的光的强度图案。 强度图案包括具有平均斑点直径在阵列的周期距离的一半和两倍之间的多个斑点。
-
公开(公告)号：US4867840A
公开(公告)日：1989-09-19
申请号：US174723
申请日：1988-03-29
IPC分类号： B01J27/02 , B01J27/04 , B01J27/047 , B01J37/34
CPC分类号： B01J27/04 , B01J27/02 , B01J27/047 , B01J37/341 , Y10S502/514
摘要： A method for making a layered metal chalcogenide catalyst wherein the catalyst has a crystalline structure with increased edge sites produced by lithographic methods.
摘要翻译： 一种制备层状金属硫族化物催化剂的方法，其中催化剂具有通过光刻方法产生的边缘位置增加的晶体结构。
-
公开(公告)号：US07288424B2
公开(公告)日：2007-10-30
申请号：US10720498
申请日：2003-11-24
IPC分类号： H01L21/00
CPC分类号： G02B26/0808 , B81B2201/045 , B81B2207/015 , B81B2207/07 , B81C1/00246 , B81C2201/016 , B81C2203/0735 , B81C2203/0778 , H01L27/0611
摘要： An integrated device includes one or more device drivers and a micro-electro-mechanical system (MEMS) structure monolithically coupled to the one or more device drivers. The one or more device drivers are configured to process received control signals and to transmit the processed control signals to the MEMS structure. Methods of fabricating integrated devices are also disclosed.
摘要翻译： 集成器件包括一个或多个器件驱动器和与该一个或多个器件驱动器单片耦合的微机电系统（MEMS）结构。 一个或多个设备驱动器被配置为处理接收的控制信号并将经处理的控制信号传送到MEMS结构。 还公开了制造集成器件的方法。
-
公开(公告)号：US07285766B2
公开(公告)日：2007-10-23
申请号：US11129967
申请日：2005-05-16
CPC分类号： G06F3/0317 , H01L27/1446 , H01L31/02024
摘要： One embodiment relates to an optical displacement sensor for sensing relative movement between a data input device and a surface by determining displacement of optical features in a succession of frames. The sensor includes an illuminator and a detector. The illuminator has a light source and illumination optics to illuminate a portion of the surface with a planar phase-front. The detector has a plurality of photosensitive elements and imaging optics. The illuminator and the detector are configured such that the illuminated portion of the surface is less than fifty percent larger than a field of view of the photosensitive elements of the detector. Other embodiments are also described.
摘要翻译： 一个实施例涉及用于通过确定一连串框架中的光学特征的位移来感测数据输入设备和表面之间的相对移动的光学位移传感器。 该传感器包括一个照明器和一个检测器。 照明器具有光源和照明光学器件，用平面相位前照射一部分表面。 检测器具有多个感光元件和成像光学元件。 照明器和检测器被配置为使得表面的照射部分小于检测器的感光元件的视野的百分之五十以上。 还描述了其它实施例。
-
公开(公告)号：US5440575A
公开(公告)日：1995-08-08
申请号：US223877
申请日：1994-04-06
IPC分类号： H01L21/3105 , H01L21/316 , H01S5/00 , H01S5/022 , H01S5/028 , H01S3/19
CPC分类号： H01L21/02164 , H01L21/02263 , H01L21/3105 , H01L21/31608 , H01S5/0021 , H01S5/02228 , H01S5/02248 , H01S5/02288 , H01S5/0282 , H01S5/0683
摘要： Disclosed are high reliability semiconductor lasers that need not be maintained inside a hermetic enclosure. Such lasers can advantageously be used in a variety of applications, e.g., in optical fiber telecommunications, and in compact disc players. Such "non-hermetic" lasers comprise facet coatings that comprise a dielectric layer that has very low water saturation value. In preferred embodiments this dielectric layer is SiO.sub.x (1.ltoreq.x
摘要翻译： 公开了不需要保持在密封外壳内的高可靠性半导体激光器。 这样的激光器可以有利地用于各种应用中，例如在光纤通信中，以及在光盘播放器中。 这种“非密封”激光器包括具有非常低的水饱和度值的介电层的小面涂层。 在优选实施例中，该电介质层是通过分子束法沉积的SiO x（1
-
公开(公告)号：US4590399A
公开(公告)日：1986-05-20
申请号：US659172
申请日：1984-10-09
申请人： Charles B. Roxlo , Peter D. Persans
发明人： Charles B. Roxlo , Peter D. Persans
CPC分类号： H01L29/84 , H01L41/187 , Y10S310/80
摘要： Piezoelectric transducers and oscillators made from amorphous superlattice structures are disclosed. These materials have large built-in fields necessary for piezoelectricity but they are materials which can be deposited at low temperatures onto virtually any substrate.
摘要翻译： 公开了由非晶超晶格结构制成的压电换能器和振荡器。 这些材料具有压电性所需的大的内置领域，但它们是能够在低温下沉积到几乎任何基底上的材料。
-
-
-
-
-
-
-
-
-
搜索结果
24 条记录 (耗时 0.033 秒)
