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1. 发明授权

US4843611A Superluminescent diode and single mode laser 失效
标题翻译：超发光二极管和单模激光器
公开(公告)号：US4843611A
公开(公告)日：1989-06-27
申请号：US232505
申请日：1988-08-12
申请人： Sze-Keung Kwong , Kam Y. Lau , Nadav Bar-Chaim , Israel Ury
发明人： Sze-Keung Kwong , Kam Y. Lau , Nadav Bar-Chaim , Israel Ury
IPC分类号： H01L33/00 , H01S5/042 , H01S5/06 , H01S5/10 , H01S5/16
CPC分类号： H01L33/0045 , H01S5/0601 , H01S5/10 , H01S5/164 , H01S5/0425 , H01S5/0602
摘要： A buried heterostructure window device has an elongated layer of gain medium surrounded by a lower index of refraction medium for guiding light along the length of the gain medium. A window and an antireflective layer are deposited on the output end of the gain layer to minimize reflections. A portion of the gain medium nearer the output end of the device is electrically pumped, leaving an unpumped end of the gain medium remote from the output end. The unpumped portion of the gain medium absorbs light travelling along the length of the gain medium. This inhibits reflection from the end of the gain medium remote from the output end. When the device is pumped with a moderate power level, strong superluminescent output is obtained. When the device is pumped well above the lasing threshold by reason of "burning through" the unpumped absorbing portion of the gain medium, a single mode laser is obtained with side band power at least 20 db below the power of the principal oscillation mode. "Burning through" the unpumped absorbing portion can be inhibited by extracting current carriers from that portion of the medium.
摘要翻译：掩埋异质结构窗口装置具有由较低折射率介质包围的增益介质的细长层，用于沿着增益介质的长度引导光。窗口和抗反射层沉积在增益层的输出端，以最小化反射。靠近设备的输出端的增益介质的一部分被电泵浦，使增益介质的未抽头端远离输出端。增益介质的未抽出部分吸收沿着增益介质的长度行进的光。这抑制了远离输出端的增益介质末端的反射。当设备在中等功率水平下泵浦时，获得强超发光输出。当器件由于“燃烧”增益介质的未吸收吸收部分而被泵浦在激光阈值之上时，获得单模激光器，其边带功率比主振荡模式的功率低至少20db。通过从介质的该部分提取电流载流子可以抑制“燃烧”未吸收的吸收部分。

2. 发明授权

US4764934A Superluminescent diode and single mode laser 失效
标题翻译：超发光二极管和单模激光器
公开(公告)号：US4764934A
公开(公告)日：1988-08-16
申请号：US78367
申请日：1987-07-27
申请人： Sze-Keung Kwong , Kam Y. Lau , Nadav Bar-Chaim , Israel Ury
发明人： Sze-Keung Kwong , Kam Y. Lau , Nadav Bar-Chaim , Israel Ury
IPC分类号： H01L33/00 , H01S5/00 , H01S5/042 , H01S5/06 , H01S5/16 , H01S5/227 , H01S3/19
CPC分类号： H01S5/0601 , H01L33/0045 , H01S5/164 , H01S5/0425 , H01S5/0602
摘要： A buried heterostructure window device has an elongated layer of gain medium surrounded by a lower index of refraction medium of guiding light along the length of the gain medium. A window and an antireflective layer are deposited on the output end of the gain layer to minimize reflections. A portion of the gain medium nearer the output end of the device is electrically pumped, leaving an unpumped end of the gain medium remote from the output end. The unpumped portion of the gain medium absorbs light travelling along the length of the gain medium. This inhibits reflection from the end of the gain medium remote from the output end. When the device is pumped with a moderate power level, strong superluminescent output is obtained. When the device is pumped well above the lasing threshold by reason of "burning through" the unpumped absorbing portion of the gain medium, a single mode laser is obtained with side band power at least 20 db below the power of the principal oscillation mode. "Burning through" the unpumped absorbing portion can be inhibited by extracting current carriers from that portion of the medium.

3. 发明授权

US5668562A Measurement-based method of optimizing the placement of antennas in a RF distribution system 失效
标题翻译：基于测量的优化RF分配系统中天线放置的方法
公开(公告)号：US5668562A
公开(公告)日：1997-09-16
申请号：US635300
申请日：1996-04-19
申请人： David M. Cutrer , John B. Georges , Kam Y. Lau
发明人： David M. Cutrer , John B. Georges , Kam Y. Lau
IPC分类号： G01R29/10
CPC分类号： G01R29/10
摘要： The placement of repeater or base station antennas in an in-building or urban wireless RF communications network is optimized using field measurements. Test antennas are placed at a number of sites within the coverage area, and the signal from each test antenna is measured at different locations within the coverage area. The measurement allows the simulation of the coverage provided by different arrangements of antennas. An optimum arrangement can then be chosen. The optimum arrangement of antennas is chosen by maximizing a utility function that depends on the quality of the coverage within the area and on the cost of installing an arrangement. A database of architectural categories (building plans) and measurement results for each category is built by a method of the present invention. A new building is then matched to the closest component categories in the database, thus allowing the optimization of coverage in a coverage area without the measurement of signals from nest antennas in the new building.
摘要翻译：中继器或基站天线在建筑物或城市无线RF通信网络中的布置使用现场测量进行了优化。测试天线被放置在覆盖区域内的多个位置处，并且在覆盖区域内的不同位置处测量来自每个测试天线的信号。该测量允许模拟由不同天线布置提供的覆盖。然后可以选择最佳布置。通过最大化效用函数来选择天线的最佳布置，该功能取决于区域内的覆盖质量以及安装安排的成本。通过本发明的方法构建了每个类别的建筑类别（建筑物计划）和测量结果的数据库。然后将新建筑物与数据库中最接近的组件类别进行匹配，从而允许优化覆盖区域中的覆盖范围，而无需测量新建筑物中嵌套天线的信号。

4. 发明授权

US5983070A Method and system providing increased antenna functionality in a RF distribution system 失效
标题翻译：在RF分配系统中提供增加的天线功能的方法和系统
公开(公告)号：US5983070A
公开(公告)日：1999-11-09
申请号：US841941
申请日：1997-04-08
申请人： John B. Georges , David M. Cutrer , Kam Y. Lau
发明人： John B. Georges , David M. Cutrer , Kam Y. Lau
IPC分类号： H04B7/185 , H03D7/00 , H03D7/16 , H03L7/07 , H03L7/23 , H04B1/26 , H04B3/00 , H04B7/208 , H04B7/26 , H04W84/14 , H04B3/58
CPC分类号： H03D7/163 , H03L7/07 , H03L7/23 , H04B1/0003 , H04B1/0007 , H04B1/26 , H04B3/00 , H04B7/2609 , H03D7/00 , H04W84/14
摘要： A system and method for transmitting a radio frequency (RF) signal in a RF bandwidth over a low bandwidth medium, e.g., in-building unshielded twisted pair (UTP) cabling, which has a transmission bandwidth below the RF bandwidth. The system has a unit for receiving the RF signal and a global reference oscillator for distributing a global reference tone of high stability to the entire system. Local oscillators controlled by this global reference tone deliver RF reference tones of high stability required for mixing the RF signal to obtain an intermediate frequency (IF) signal which is fed through the low bandwidth medium to remote sites. A 10 base T cable network, often pre-existing in many building structures, provides a suitable, cost effective low bandwidth medium for such RF communication. Two of the four twisted pair cables of a UTP cable are sufficient to support bi-directional communication. The remaining twisted pair cables are used to control remote site antenna functions or support other types of communication services such as data LAN, video, wired voice, or other wireless services such as PCS or wireless LAN.
摘要翻译：一种用于通过低带宽介质（例如，内置非屏蔽双绞线（UTP）布线）在RF带宽中发射射频（RF）信号的系统和方法，其具有低于RF带宽的传输带宽。该系统具有用于接收RF信号的单元和用于向整个系统分配具有高稳定性的全局参考色调的全局参考振荡器。由该全球参考色调控制的本地振荡器提供混合RF信号所需的高稳定性的RF参考音，以获得通过低带宽介质馈送到远程站点的中频（IF）信号。通常预先存在于许多建筑结构中的10 Base T电缆网络为这种RF通信提供了合适的，具有成本效益的低带宽介质。 UTP电缆的四根双绞线中的两根足以支持双向通信。剩余的双绞线电缆用于控制远程站点天线功能或支持其他类型的通信服务，如数据局域网，视频，有线语音或其他无线服务，如PCS或无线局域网。

5. 发明授权

US5867297A Apparatus and method for optical scanning with an oscillatory microelectromechanical system 失效
标题翻译：用振荡微机电系统进行光学扫描的装置和方法
公开(公告)号：US5867297A
公开(公告)日：1999-02-02
申请号：US796301
申请日：1997-02-07
申请人： Meng-Hsiung Kiang , Kam Y. Lau , Richard S. Muller , Olav Solgaard
发明人： Meng-Hsiung Kiang , Kam Y. Lau , Richard S. Muller , Olav Solgaard
IPC分类号： G02B26/10 , G02B26/08
CPC分类号： G02B26/0833 , G02B26/0841
摘要： An optical scanning system includes a light source to generate a light beam. An oscillatory microelectromechanical system including a mirror deflects the light beam in a predetermined manner. The light source and microelectromechanical system are formed in a silicon substrate. Rotational shafts in the microelectromechanical system facilitate oscillatory movement of the mirror.
摘要翻译：光学扫描系统包括产生光束的光源。包括镜的振荡微机电系统以预定的方式偏转光束。光源和微机电系统形成在硅衬底中。微机电系统中的旋转轴有助于镜子的振荡运动。

6. 发明授权

US5631916A Apparatus and method for optically transmitting electrical signals in the 20-300 gigahertz frequency range 失效
标题翻译：用于在20-300千兆赫兹频率范围内光学传输电信号的装置和方法
公开(公告)号：US5631916A
公开(公告)日：1997-05-20
申请号：US432452
申请日：1995-05-01
申请人： John B. Georges , Kam Y. Lau
发明人： John B. Georges , Kam Y. Lau
IPC分类号： H01S5/062 , H01S5/0625 , H01S5/065 , H04B10/155 , H01S3/10
CPC分类号： H01S5/065 , H01S5/06213 , H04B10/504 , H01S5/06226 , H01S5/0625
摘要： The invention discloses a method and an apparatus for optically transmitting a narrow-band optical signal beam having a sub-carrier frequency in the 20 to 300 GHz range. The apparatus has a semiconductor laser with a lasing cavity of length L. The length L preferably ranges from less than 1 mm to 10 mm, thereby defining the round-trip resonance frequency according to the following equation c/2 nL. The apparatus has a signal source for generating an electrical modulating signal having a modulation frequency contained in a narrow band containing the round-trip resonance frequency. An in-coupling means delivers the electrical modulating signal to the semiconductor laser which produces a sub-carrier modulated signal beam whose sub-carrier modulation frequency lies within a response band and corresponds to the modulation frequency. The apparatus further includes a biasing device for providing a biasing voltage for tuning the response band and the sub-carrier modulated signal beam. According to the method of the invention the biasing voltage is used to set the width of the response band and to set a phase shift in the sub-carrier modulated optical signal beam. Varying the biasing voltage thus allows to phase-modulate the sub-carrier modulated optical signal beam.
摘要翻译：本发明公开了一种用于光学传输具有20至300GHz范围内的副载波频率的窄带光信号光束的方法和装置。该装置具有长度为L的激光腔的半导体激光器。长度L优选地在小于1mm至10mm的范围内，从而根据下列等式c / 2nL定义往返谐振频率。该装置具有用于产生具有包含在包含往返谐振频率的窄带中的调制频率的电调制信号的信号源。耦合装置将电调制信号传送到半导体激光器，其产生子载波调制频率位于响应频带内并对应于调制频率的副载波调制信号波束。该装置还包括用于提供用于调谐响应频带和副载波调制信号波束的偏置电压的偏置装置。根据本发明的方法，偏置电压用于设置响应频带的宽度并设置副载波调制光信号光束中的相移。改变偏置电压因此允许相位调制副载波调制的光信号光束。

7. 发明授权

US4287606A Fiber optic transmission line stabilization apparatus and method 失效
标题翻译：光纤传输线稳定装置及方法
公开(公告)号：US4287606A
公开(公告)日：1981-09-01
申请号：US188160
申请日：1980-09-17
申请人： Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch , George F. Lutes, Jr. , Kam Y. Lau
发明人： Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch , George F. Lutes, Jr. , Kam Y. Lau
IPC分类号： H04B10/152 , H04B9/00
CPC分类号： H04B10/548
摘要： A fiber optic transmission line stabilizer for providing a phase-stabilized signal at a receiving end of a fiber optic transmission line (26) with respect to a reference signal at a transmitting end of the fiber optic transmission line (26) so that the phase-stabilized signal will have a predetermined phase relationship with respect to the reference signal regardless of changes in the length or dispersion characteristics of the line (26). More particularly, a reference signal of RF frequency modulates a 0.85 micrometer wavelength optical transmitter (20). The output of the optical transmitter (20) passes through a first optical filter (24) and a voltage-controller phase shifter (22), the output of the phase shifter (22) being provided to the fiber optic transmission line (26). At the receiving end of the fiber optic transmission line (26), the signal is demodulated, the demodulated signal being utilized to modulate a 1.06 micrometer optical transmitter (34). The output signal from the 1.06 micrometer optical transmitter (34) is provided to the same fiber optic transmission line (26) and passes through the voltage-controlled phase shifter (22) to a phase error detector (36). The phase of the modulation of the 1.06 micrometer wavelength signal is compared to the phase of the reference signal by the phase error detector (36), the detector (36) providing a phase control signal related to the phase difference. This control signal is provided to the voltage controlled phase shifter (22) which alters the phase of both optical signals passing therethrough until a predetermined phase relationship between modulation on the 1.06 micrometer signal and the reference signal is obtained.
摘要翻译：一种光纤传输线路稳定器，用于在光纤传输线（26）的发射端处的参考信号处在光纤传输线（26）的接收端处提供相位稳定的信号，稳定的信号将相对于参考信号具有预定的相位关系，而不管线（26）的长度或色散特性的变化。更具体地，RF频率的参考信号调制0.85微米波长的光发送器（20）。光发射器（20）的输出通过第一滤光器（24）和电压控制器移相器（22），移相器（22）的输出被提供给光纤传输线（26）。在光纤传输线（26）的接收端，解调信号，解调信号用于调制1.06微米的光发送器（34）。来自1.06微米光发射机（34）的输出信号被提供给相同的光纤传输线（26），并通过压控移相器（22）传送到相位误差检测器（36）。通过相位误差检测器（36）将1.06微米波长信号的调制相位与参考信号的相位进行比较，检测器（36）提供与相位差相关的相位控制信号。该控制信号被提供给电压控制移相器（22），其改变通过其中的两个光信号的相位，直到获得1.06微米信号上的调制与参考信号之间的预定相位关系。

8. 发明授权

US06690657B1 Multichannel distributed wireless repeater network 有权
标题翻译：多通道分布式无线中继器网络
公开(公告)号：US06690657B1
公开(公告)日：2004-02-10
申请号：US09513367
申请日：2000-02-25
申请人： Kam Y. Lau , Iason Vassiliou , Mahesh Venkatraman
发明人： Kam Y. Lau , Iason Vassiliou , Mahesh Venkatraman
IPC分类号： H04J100
CPC分类号： H04W16/14 , H04B7/15542 , H04B7/2606 , H04W72/04 , H04W84/047 , H04W84/12 , Y02D70/142 , Y02D70/144 , Y02D70/168 , Y02D70/22 , Y02D70/446 , Y02D70/449
摘要： A multichannel distributed wireless repeater network, methods for its operation, and system components are disclosed. The network is designed to facilitate high-bit-rate data communication within a home, office, or similarly constrained area. According to the described embodiments, RF radiation outside of the desired network area can be minimized by use of low power transmitter and repeaters, while short paths and uniform signal strength within the network area predominate, facilitating high bit rates. The network utilizes low-power RF transmitters that generally have insufficient power to reliably span the entire network of receivers. To provide uniform coverage throughout the network, channel-shifting repeaters are used. These repeaters pick up a transmitted (or retransmitted) signal on one channel, shift it to a substantially non-interfering channel, and retransmit the signal. The receivers can preferably receive signals on the best available channel, whether it be the original channel or a repeating channel.
摘要翻译：公开了一种多通道分布式无线中继器网络，其操作方法和系统组件。该网络旨在促进家庭，办公室或类似约束区域内的高比特率数据通信。根据所描述的实施例，可以通过使用低功率发射机和中继器来使所需网络区域之外的RF辐射最小化，同时短路径和网络区域内均匀的信号强度占主导地位，便于高比特率。网络利用低功率 RF发射机通常没有足够的功率可靠地跨越整个接收机网络。为了在整个网络中提供均匀的覆盖，使用信道移位中继器。这些中继器在一个信道上拾取发送（或重传）信号，将其移动到基本上不干扰的信道，并重新发送信号。接收机可以优选地在最佳可用信道上接收信号，无论它是原始信道还是重复信道。

9. 发明授权

US6014546A Method and system providing RF distribution for fixed wireless local loop service 失效
标题翻译：为固定无线本地环路服务提供RF分配的方法和系统
公开(公告)号：US6014546A
公开(公告)日：2000-01-11
申请号：US834927
申请日：1997-04-08
申请人： John B. Georges , David M. Cutrer , Kam Y. Lau
发明人： John B. Georges , David M. Cutrer , Kam Y. Lau
IPC分类号： H04B7/185 , H03D7/00 , H03D7/16 , H03L7/07 , H03L7/23 , H04B1/26 , H04B3/00 , H04B7/208 , H04B7/26 , H04W84/14 , H04B3/58
CPC分类号： H03D7/163 , H03L7/07 , H03L7/23 , H04B1/0003 , H04B1/0007 , H04B1/26 , H04B3/00 , H04B7/2609 , H03D7/00 , H04W84/14
摘要： A system and method is disclosed for distributing a radio frequency (RF) signal within a building structure or other structure not readily transparent to radio frequencies. The RF signal originates at a wireless local loop (WLL) base station and is intercepted by a main antenna on the building structure. The intercepted RF signal, which is contained in a RF bandwidth, is distributed throughout the building structure over a low bandwidth medium, e.g., in-building cabling, which has a transmission bandwidth below the RF bandwidth. In order to accomplish this, the system has a global reference oscillator for distributing a global reference tone of high stability to the entire system. Local oscillators controlled by this global reference tone deliver RF reference tones of high stability required for mixing the RF signal to obtain an intermediate frequency (IF) signal which is fed through the low bandwidth medium to remote sites. At the remote sites the RF signal recovered from the IF signal by mixing with the RF reference tone and re-transmitted, often to WLL communication units. When the WLL base station has a connection to the Public Switch Telephone Network (PSTN), the WLL communication units provide users with wireless telephone services.
摘要翻译：公开了用于在建筑物结构或其他对射频不容易透明的其它结构内分配射频（RF）信号的系统和方法。 RF信号源于无线本地环路（WLL）基站，并由建筑物结构上的主天线拦截。被包含在RF带宽中的截取的RF信号通过低带宽介质（例如建筑物内布线）分布在整个建筑物结构中，该布线具有低于RF带宽的传输带宽。为了实现这一点，该系统具有全局参考振荡器，用于向整个系统分配高稳定性的全局参考色调。由该全球参考色调控制的本地振荡器提供混合RF信号所需的高稳定性的RF参考音，以获得通过低带宽介质馈送到远程站点的中频（IF）信号。在远程站点，RF信号通过与RF参考音频混合而从IF信号恢复，并经常发送到WLL通信单元。当WLL基站与公共交换机电话网（PSTN）的连接时，WLL通信单元向用户提供无线电话服务。

10. 发明授权

US5765099A Distribution of radio-frequency signals through low bandwidth infrastructures 失效
标题翻译：通过低带宽基础设施分配射频信号
公开(公告)号：US5765099A
公开(公告)日：1998-06-09
申请号：US871556
申请日：1997-06-10
申请人： John B. Georges , David M. Cutrer , Kam Y. Lau
发明人： John B. Georges , David M. Cutrer , Kam Y. Lau
IPC分类号： H04B7/185 , H03D7/00 , H03D7/16 , H03L7/07 , H03L7/23 , H04B1/26 , H04B3/00 , H04B7/208 , H04B7/26 , H04W84/14 , H04B3/58
CPC分类号： H04B1/0007 , H03D7/163 , H03L7/07 , H03L7/23 , H04B1/0003 , H04B1/26 , H04B3/00 , H04B7/2609 , H03D7/00 , H04W84/14
摘要： A system and method for transmitting a radio frequency (RF) signal in a RF bandwidth over a low bandwidth medium, e.g., in-building cabling, which has a transmission bandwidth below the RF bandwidth. The system has a unit for receiving the RF signal and a global reference oscillator for distributing a global reference tone of high stability to the entire system. Local oscillators are controlled by adjustment signals derived from this global reference tone to deliver RF reference tones of high stability required for mixing the RF signal to obtain an intermediate frequency (IF) signal which is fed through the low bandwidth medium. The global reference tone is preferably delivered through the same low bandwidth medium to desired locations, such as remote coverage sites in a network for cellular communications, cordless telephony, local RF communications, interactive multi-media video, high bit-rate local communications.
摘要翻译：一种用于通过低带宽介质（例如建筑内布线）在RF带宽中发射射频（RF）信号的系统和方法，其具有低于RF带宽的传输带宽。该系统具有用于接收RF信号的单元和用于向整个系统分配具有高稳定性的全局参考色调的全局参考振荡器。本地振荡器由来自该全局参考音调的调整信号控制，以提供混合RF信号所需的高稳定性的RF参考音，以获得通过低带宽介质馈送的中频（IF）信号。全局参考音优选地通过相同的低带宽介质传送到期望的位置，例如用于蜂窝通信的网络中的远程覆盖站点，无绳电话，本地RF通信，交互式多媒体视频，高比特率本地通信。

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