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    • 12. 发明授权
    • Optical amplifier pre-emphasis and equalization method and optical communications system incorporating same
    • 光放大器预加重和均衡方法以及结合相同的光通信系统
    • US07369300B2
    • 2008-05-06
    • US11489774
    • 2006-07-20
    • Balakrishnan SridharMichael Y. Frankel
    • Balakrishnan SridharMichael Y. Frankel
    • H01S4/00H04B10/12
    • H04B10/0797H01S3/06758H01S2301/02H04B10/2935
    • The present invention provides an optical amplifier pre-emphasis and equalization method that alleviates the optical amplifier gain ripple penalty experienced in conventional optical communications systems. This method includes storing measured communications channel signal gain ripple information, acquired during factory calibration, in the internal memory of each optical amplifier module. When the optical amplifiers are assembled into a chain, system software retrieves this communications channel signal gain ripple information from each optical amplifier module and computes the pre-emphasis or equalization required for each channel in order to obtain a flat SNR at a receiver. The method also includes measuring the ambient temperature of each optical amplifier module and applying a correction based on the expected change in gain response of each optical amplifier. The method further includes, for Raman amplifiers and the like, applying a fiber type, gain setting, GFF error, etc. correction based on the expected change in gain response of each optical amplifier. The method relies on using VOAs at the sources or DGEs/RBFs in the optical signal path to pre-emphasize or equalize the optical channels.
    • 本发明提供一种减轻常规光通信系统中经历的光放大器增益波动损耗的光放大器预加重和均衡方法。 该方法包括将在工厂校准期间获取的测量的通信信道增益纹波信息存储在每个光放大器模块的内部存储器中。 当光放大器被组装成链时,系统软件从每个光放大器模块检索该通信信道增益纹波信息,并计算每个信道所需的预加重或均衡,以便在接收机处获得平坦的SNR。 该方法还包括测量每个光放大器模块的环境温度,并且基于每个光放大器的增益响应的预期变化来应用校正。 该方法还包括对于拉曼放大器等,基于每个光放大器的增益响应的预期变化来应用光纤类型,增益设置,GFF误差等校正。 该方法依赖于在光信号路径中的源或DGE / RBF处使用VOA来预加强或均衡光信道。
    • 13. 发明授权
    • Optical bypass upgrade configuration
    • 光旁路升级配置
    • US07356259B1
    • 2008-04-08
    • US10868835
    • 2004-06-17
    • Charles Haggans
    • Charles Haggans
    • H04J14/02
    • H04J14/0227H04J14/0241H04J14/0284H04Q11/0062H04Q2011/0016H04Q2011/0052H04Q2011/0083
    • Optical bypass node upgrade configurations are disclosed: (1) a configuration where optical taps are pre-positioned in wavelength division multiplex (WDM) line systems terminating at optical-electrical-optical (OEO) core switching nodes to allow for future upgrade of the nodes to degree-two or higher optical bypass; (2) a configuration where the taps are pre-positioned in a degree-two optical bypass node to allow for future upgrade to a degree-N optical bypass node; and (3) a configuration and procedure for upgrading OEO core switching nodes to optical bypass when the taps have not been pre-positioned in the WDM line systems. These configurations do not introduce bit errors for non-upgraded optical paths.
    • 公开了光旁路节点升级配置:(1)其中光学抽头预先定位在终端于光电光(OEO)核心交换节点的波分复用(WDM)线路系统中以允许将来升级节点的配置 到二级以上的光学旁路; (2)一种配置,其中抽头被预先定位在二级光旁路节点中,以允许将来升级到N度光旁路节点; 以及(3)当在WDM线路系统中没有预定位器时,将OEO核心交换节点升级到光学旁路的配置和过程。 这些配置不会为未升级的光路引入比特错误。
    • 16. 发明授权
    • Self-propelled toy duck
    • 自行式玩具鸭
    • US07347759B2
    • 2008-03-25
    • US11210776
    • 2005-08-24
    • Robert Brian Williams, Sr.Susan Shipley Adkison
    • Robert Brian Williams, Sr.Susan Shipley Adkison
    • A63H23/10
    • A63H13/02A63H23/00A63H31/08
    • A self-propelled aquatic apparatus having a duck shaped body, wherein the body is partially filled with floatation material, a base, a waterproof battery container, a battery, a battery compartment, an electro-mechanical propulsion mechanism having a pair of webbed feet, which alternately articulate from a forward down position to a rearward raised position, and a power switch. The webbed feet are slightly cupped to enhance paddling efficiency when moving from the forward down position to the rearward raised position, and are made of a relatively flexible material, such that the webbed feet will distort rather than break if they encounter a hard surface or are bent, and will not scratch the skin. The webbed feet have a coupling extension, where said coupling extension has an end that is longer in the front and shorter in the back, where the shorter end enables each of the webbed feet, while in the rearward raised position, to rotate closer to the body as the apparatus is propelled through water, thereby lowering the hydrodynamic resistance of the raised webbed foot.
    • 一种具有鸭形体的自行式水上装置,其中,身体部分地装有漂浮材料,底座,防水电池容器,电池,电池室,具有一对蹼脚的机电推进机构, 其从前进位置交替地铰接到向后提升位置,以及电源开关。 蹼脚是略微杯状的,以便在从向前向下位置移动到向后升高位置时提高划桨效率,并且由相对柔性的材料制成,使得如果蹼脚会遇到坚硬的表面或者是 弯曲,不会刮伤皮肤。 蹼脚具有联接延伸部,其中所述联接延伸部具有在前部较长并且在后部较短的端部,其中较短的端部使得每个蹼状脚部在向后提升位置中更接近 身体随着装置被推进通过水,从而降低升高的蹼脚的流体动力学阻力。
    • 20. 发明授权
    • Systems and methods for real-time compensation for non-linearity in optical sources for analog signal transmission
    • 用于模拟信号传输的光源非线性的实时补偿系统和方法
    • US07505496B2
    • 2009-03-17
    • US11398107
    • 2006-04-05
    • Michael H. Shahine
    • Michael H. Shahine
    • H01S3/00
    • H01S5/06832H01S5/0427
    • The present invention provides a compact analog directly modulated laser configuration that is suitable for use in the field that uses electrical feedback to compensate for non-linearity in real time, such that no matter how the LI curve changes, the electrical feedback compensates for non-linearity by amplifying a portion of the output analog optical signal and combining it with the input analog electrical signal using the standard control method of negative feedback. When the gain of the feedback loop is relatively high, the overall transfer function of the system is primarily dependent on the feedback loop gain block, which is substantially linear. This is accomplished by incorporating a relatively large bandwidth photo-detector at the back facet of the laser that both monitors the output power of the system and provides a feedback signal to the linearization control circuit, as well as an amplifier. The amplified signal from the relatively large bandwidth photo-detector is used to correct for various undesirable effects, such as non-linearity and relative intensity noise (RIN) of the laser. The signal from the relatively large bandwidth photo-detector also allows the laser to operate effectively close to threshold.
    • 本发明提供了一种紧凑的模拟直接调制激光器配置,其适用于使用电反馈来实时补偿非线性的领域,使得无论LI曲线如何变化,电反馈补偿非线性, 通过放大一部分输出模拟光信号并使用负反馈的标准控制方法将其与输入的模拟电信号进行组合来实现线性度。 当反馈环路的增益相对较高时,系统的整体传递函数主要取决于反馈环路增益块,其基本上是线性的。 这通过在激光器的后面结合一个相对较大的带宽光电检测器来实现,该光检测器监视系统的输出功率,并向线性化控制电路以及放大器提供反馈信号。 使用来自较大带宽光电检测器的放大信号来校正各种不期望的影响,例如激光的非线性和相对强度噪声(RIN)。 来自相对较大带宽光电检测器的信号也允许激光器有效地接近阈值。