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    Broadband tunable semiconductor laser source
    2.
    发明授权
    Broadband tunable semiconductor laser source 失效
    宽带可调半导体激光源

    公开(公告)号：US6108362A

    公开(公告)日：2000-08-22

    申请号：US954305

    申请日：1997-10-17

    申请人： Laura Ellen Adams ,  Clyde George Bethea ,  Wei-Chiao Fang ,  Gerald Nykolak ,  Roosevelt People ,  Arthur Mike Sergent ,  Tawee Tanbun-Ek ,  Won-Tien Tsang

    发明人： Laura Ellen Adams ,  Clyde George Bethea ,  Wei-Chiao Fang ,  Gerald Nykolak ,  Roosevelt People ,  Arthur Mike Sergent ,  Tawee Tanbun-Ek ,  Won-Tien Tsang

    IPC分类号： H01S3/10 ,  H01S5/0625 ,  H01S5/10 ,  H01S5/00 ,  H01S3/08

    CPC分类号： H01S5/06258 ,  H01S5/10

    摘要： A tunable semiconductor laser comprises a gain section having an MQW active region, a uniform pitch grating DFB region, and first waveguide. A composite reflector, including a second MQW region and a second waveguide, forms a cavity resonator with the DFB region. A voltage applied to the composite reflector induces a quantum confined stark effect, thereby allowing the wavelength to be altered. In one embodiment, the current drive to the active region and the shape of the first waveguide (e.g., a raised-sine function) are mutually adapted so that N longitudinal modes have essentially the same threshold gain and so that the DFB region spanned by the first waveguide is segmented into N zones, each zone providing optical feedback at a different wavelength corresponding to a different longitudinal mode.

    摘要翻译： 可调谐半导体激光器包括具有MQW有源区，均匀间距光栅DFB区和第一波导的增益部。 包括第二MQW区域和第二波导的复合反射器与DFB区域形成空腔谐振器。 施加到复合反射器的电压引起量子限制的斯塔克效应，从而允许改变波长。 在一个实施例中，对有源区域的当前驱动和第一波导的形状（例如，升高的正弦函数）相互适应，使得N个纵向模式具有基本上相同的阈值增益，并且使得由 第一波导被分割成N个区域，每个区域提供对应于不同纵向模式的不同波长的光学反馈。

    Sub-carrier multiplexing in broadband optical networks
    4.
    发明授权
    Sub-carrier multiplexing in broadband optical networks 失效
    宽带光网络中的子载波复用

    公开(公告)号：US06081361A

    公开(公告)日：2000-06-27

    申请号：US954575

    申请日：1997-10-17

    申请人： Laura Ellen Adams ,  Clyde George Bethea ,  Gerald Nykolak ,  Roosevelt People ,  Tawee Tanbun-Ek

    发明人： Laura Ellen Adams ,  Clyde George Bethea ,  Gerald Nykolak ,  Roosevelt People ,  Tawee Tanbun-Ek

    IPC分类号： H04J14/00 ,  H01S5/00 ,  H01S5/02 ,  H01S5/026 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/50 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J7/00 ,  H04J14/02 ,  H04B10/01 ,  H01S3/08 ,  H04B10/12

    CPC分类号： H04J14/0298 ,  H01S5/0265 ,  H01S5/06258 ,  H04J7/00 ,  H01S5/1243

    摘要： In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subcarrier frequency channels, and at a third level discrimination is based on n FM subcarrier frequency channels. Thus, a total of Nmn distinguishable optical channels can be accommodated and a like number of users served. The laser transmitter comprises a broadband, tunable semiconductor laser which includes an intracavity, integrated composite reflector to which a tuning voltage and a FM dither signal are applied, an intracavity gain section to which drive current is applied, and an extracavity, integrated electroabsorption modulator to which an information (e.g., data, voice, video) signal and an AM dither signal are applied. The tuning voltage provides coarse wavelength tuning among N WDM channels, whereas the FM dither signal produces an additional m channels via FM-SCM. The AM dither likewise produces an additional n channels via AM-SCM.

    摘要翻译： 在WDM光纤网络中，独特的激光发射机使信号能够以三个等级的级别进行路由：在一个级别，信号路径之间的鉴别基于N个WDM波长信道，在另一个等级，鉴别是基于m个AM子载波频率信道， 并且在第三级鉴别是基于n个FM子载波频率信道。 因此，可以容纳总共Nmn个可辨别的光学通道并且服务相同数量的用户。 激光发射机包括宽带可调谐半导体激光器，其包括腔内，集成复合反射器，调谐电压和FM抖动信号施加到该腔内，集成复合反射器，施加驱动电流的腔内增益部分，以及腔外集成电吸收调制器 其中应用信息（例如，数据，语音，视频）信号和AM抖动信号。 调谐电压在N个WDM通道中提供粗略的波长调谐，而FM抖动信号通过FM-SCM产生额外的m个通道。 AM抖动同样通过AM-SCM产生另外的n个通道。

    Optical system for reduced SBS
    6.
    发明授权
    Optical system for reduced SBS 有权
    用于减少SBS的光学系统

    公开(公告)号：US06331908B1

    公开(公告)日：2001-12-18

    申请号：US09444470

    申请日：1999-11-22

    申请人： Laura Ellen Adams ,  Clyde George Bethea ,  Lars Erik Eskildsen ,  Gerald Nykolak ,  Rossevelt People ,  Tawee Tanbun-Ek

    发明人： Laura Ellen Adams ,  Clyde George Bethea ,  Lars Erik Eskildsen ,  Gerald Nykolak ,  Rossevelt People ,  Tawee Tanbun-Ek

    IPC分类号： H04B1004

    CPC分类号： H04B10/2537

    摘要： A tunable semiconductor laser comprises a gain section having an MQW active region, a uniform pitch grating DFB region, and first waveguide. A composite reflector, including a second MQW region and a second waveguide, forms a cavity resonator with the DFB region. A tuning voltage applied to the composite reflector induces refractive index changes, thereby allowing the center wavelength to be altered. A dither signal applied the composite reflector broadens the spectrum of the laser output, thereby reducing SBS in fiber optic systems

    摘要翻译： 可调谐半导体激光器包括具有MQW有源区，均匀间距光栅DFB区和第一波导的增益部。 包括第二MQW区域和第二波导的复合反射器与DFB区域形成空腔谐振器。 施加到复合反射器的调谐电压引起折射率变化，从而允许改变中心波长。 施加复合反射器的抖动信号使激光输出的频谱变宽，从而减少光纤系统中的SBS

    Method and apparatus for operational low-stress optical fiber storage
    7.
    发明授权
    Method and apparatus for operational low-stress optical fiber storage 失效
    低应力光纤储存操作方法及装置

    公开(公告)号：US07000863B2

    公开(公告)日：2006-02-21

    申请号：US10674207

    申请日：2003-09-29

    申请人： Clyde George Bethea ,  John Philip Franey

    发明人： Clyde George Bethea ,  John Philip Franey

    IPC分类号： G02B6/00

    CPC分类号： G02B6/4457

    摘要： A reel for storing optical fiber is disclosed that significantly reduces the torsional force applied to optical fiber as the fiber is being wound onto the reel for storage. The optical fiber reel comprises two spindles that are offset with respect to the rotational center of the reel. Such an arrangement causes the fiber to be wound onto the reel in a substantially linear fashion, thus preventing the torsional force and resulting twisting that cause micro-cracks to develop. The spindles are of a sufficiently large diameter to facilitate operational use of the fiber while stored on the spindle without increasing the attenuation of signals that could result from the use of a smaller diameter spindle.

    摘要翻译： 公开了一种用于存储光纤的卷轴，当光纤被卷绕到卷轴上用于存储时，显着地降低了施加到光纤的扭转力。 光纤卷轴包括相对于卷轴的旋转中心偏移的两个主轴。 这种布置使得纤维以基本线性的方式缠绕在卷轴上，从而防止导致微裂纹发生的扭转力和扭转。 主轴具有足够大的直径，以便于在存储在主轴上的情况下操作使用光纤，而不增加使用较小直径的主轴可能导致的信号的衰减。

    System and method for an optical signal monitor
    8.
    发明授权
    System and method for an optical signal monitor 有权
    光信号监视器的系统和方法

    公开(公告)号：US07218859B2

    公开(公告)日：2007-05-15

    申请号：US10412501

    申请日：2003-04-11

    申请人： Clyde George Bethea

    发明人： Clyde George Bethea

    IPC分类号： H04J14/08 ,  H04J14/00 ,  H04B10/00 ,  H04B10/08

    CPC分类号： H04J14/08

    摘要： Techniques and systems for monitoring of optical signals are described. Each of a plurality of optical signals is supplied to an optical port. A port signal is generated based on each of the optical signals and each of the port signals is subjected to a time delay to create a time delayed signal, with a different time delay being present in each of the time delayed signals. The time delayed signals are multiplexed to create a multiplexed signal comprising a plurality of multiplexed signal components, each component corresponding to one of the time delayed signals and exhibiting a time delay characterizing the corresponding time delayed signal. A desired one or ones of the multiplexed signal components are selected by analysis or display by specifying a time delay present in the time delayed signal represented by the desired component, and selecting a signal component exhibiting the specified time delay.

    摘要翻译： 描述了用于监视光信号的技术和系统。 多个光信号中的每一个被提供给光端口。 基于每个光信号生成端口信号，并且每个端口信号经受时间延迟以产生时间延迟信号，在每个延时信号中存在不同的时间延迟。 时间延迟信号被多路复用以产生包括多个多路复用信号分量的多路复用信号，每个分量对应于一个时间延迟信号并呈现表征对应的时间延迟信号的时间延迟。 通过分析或显示来选择所需的一个或多个复用信号分量，通过指定由所需分量表示的时间延迟信号中存在的时间延迟，以及选择表现出指定时间延迟的信号分量。

    Method and apparatus for suppressing interference using active shielding techniques
    9.
    发明授权
    Method and apparatus for suppressing interference using active shielding techniques 失效
    使用主动屏蔽技术抑制干扰的方法和装置

    公开(公告)号：US06564038B1

    公开(公告)日：2003-05-13

    申请号：US09510780

    申请日：2000-02-23

    申请人： Clyde George Bethea ,  John Philip Franey ,  Timothy Lloyd Pernell

    发明人： Clyde George Bethea ,  John Philip Franey ,  Timothy Lloyd Pernell

    IPC分类号： H04B110

    CPC分类号： H05K9/00

    摘要： A method and apparatus are disclosed for suppressing interference in a radio frequency (RF) communication system using active shielding techniques. An opposing neutralizing signal is applied to actively neutralize stray signals in a microwave communication environment. An interfering or stray signal is detected using a sensing antenna, and the opposing neutralizing signal is generated in response thereto. The opposing neutralizing signal is applied to a signal neutralizing shield to shield any desired components or devices. The opposing neutralizing signal is approximately 180 degrees out of phase, and of equal magnitude to the detected interfering signal. A phase shifter/null feedback device receives the detected stray signal, if any, and adaptively adjusts the phase and magnitude of the opposing neutralizing signal. In one embodiment, the phase shifter/null feedback device includes an integrator that generates a DC value that is proportional to the energy of the interfering signal. The DC value is applied to a voltage controlled oscillator (VCO) using known feedback techniques to adjust the phase or magnitude, or both, of the opposing neutralizing signal and to thereby minimize the DC value.

    摘要翻译： 公开了一种用于抑制使用主动屏蔽技术的射频（RF）通信系统中的干扰的方法和装置。 施加相反的中和信号以在微波通信环境中主动中和杂散信号。 使用感测天线检测干扰或杂散信号，并响应于此产生相反的中和信号。 相反的中和信号被施加到信号中和屏蔽以屏蔽任何期望的部件或装置。 相反的中和信号大约相差180度，并且与检测到的干扰信号相等。 移相器/零反馈装置接收检测到的杂散信号（如果有的话），并自适应地调整相对中和信号的相位和幅度。 在一个实施例中，移相器/零反馈装置包括积分器，其产生与干扰信号的能量成比例的DC值。 使用已知的反馈技术将DC值施加到压控振荡器（VCO），以调整相对中和信号的相位或幅度或两者，从而使DC值最小化。