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    • 11. 发明授权
    • Systems and methods reducing coherence effect in narrow line-width light sources
    • 系统和方法降低窄线宽光源的相干效应
    • US09140624B2
    • 2015-09-22
    • US13541146
    • 2012-07-03
    • Jun BaoMichael Haidar ShahineHua JiaoJean-Luc Archambault
    • Jun BaoMichael Haidar ShahineHua JiaoJean-Luc Archambault
    • G01N21/55G01M11/00
    • G01M11/3118G01N21/55
    • Systems and methods are described for reducing coherence effect in narrow line-width light sources through various modulation techniques. The systems and methods can include a narrow line-width laser source with a thermoelectric cooler thermally coupled thereto and a controller communicatively coupled to the thermoelectric cooler. The controller is configured to provide a varied input signal to the thermoelectric cooler to reduce coherence of the narrow line-width laser source by artificially broadening the narrow line-width on a time averaged basis. The systems and methods can also include direct modulation of the narrow line-width laser source. The systems and methods can include a narrow line-width Optical Time Domain Reflectometer (OTDR). The systems and methods can also include direct modulation of the narrow line-width laser source with or without the varied input signal to the thermoelectric cooler.
    • 描述了通过各种调制技术降低窄线宽光源的相干效应的系统和方法。 该系统和方法可以包括具有热耦合到其上的热电冷却器的窄线宽激光源和通信地耦合到热电冷却器的控制器。 控制器被配置为向热电冷却器提供变化的输入信号,以通过以时间平均的方式人为地加宽窄线宽来减小窄线宽激光源的相干性。 系统和方法还可以包括对窄线宽激光源的直接调制。 系统和方法可以包括窄线宽光时域反射计(OTDR)。 这些系统和方法还可以包括对具有或不具有到热电冷却器的变化的输入信号的窄线宽激光源的直接调制。
    • 15. 发明授权
    • Method and apparatus for optical amplifying device gain control with gain threshold
    • 具有增益阈值的光放大器件增益控制方法和装置
    • US07400443B1
    • 2008-07-15
    • US10716609
    • 2003-11-20
    • Balakrishnan SridharJun Bao
    • Balakrishnan SridharJun Bao
    • H04B10/17
    • H04B10/2935H04B10/2931
    • Optical amplifying method and apparatus are proposed. Constant gain amplifiers operate such that the output power of the amplifier generally tracks the input power. However, optical systems are not perfect and the input to the optical amplifier stage includes not only the desired signal, but also includes accumulated effects of the imperfections. The imperfections include losses of the fiber sections, variations in laser powers, and drifts. Thus, simple amplification not only amplifies the desired signal, but also amplifies accumulated imperfections. Such imperfections occur over time and are generally small in magnitude. By operating the amplifier such that amplification of small variations is suppressed while allowing for tracking of large input variations, amplifying the accumulated imperfections is minimized.
    • 提出了光放大方法和装置。 恒定增益放大器工作,使得放大器的输出功率通常跟踪输入功率。 然而,光学系统不是完美的,并且光放大器级的输入不仅包括期望的信号,而且还包括缺陷的累积效应。 缺陷包括光纤段的损耗,激光功率的变化和漂移。 因此,简单的放大不仅放大了期望的信号,而且放大了累积的缺陷。 这种缺陷随着时间的推移而发生,并且通常在数量上是小的。 通过操作放大器,使得抑制小变化的放大,同时允许跟踪大的输入变化,放大积累的缺陷被最小化。
    • 17. 发明申请
    • Optical communication system having dynamic gain equalization
    • 具有动态增益均衡的光通信系统
    • US20050094252A1
    • 2005-05-05
    • US10986817
    • 2004-11-15
    • Charles HaggansJun BaoHarshad SardesaiMichael FrankelMahir NayfehBalakrishnan Sridhar
    • Charles HaggansJun BaoHarshad SardesaiMichael FrankelMahir NayfehBalakrishnan Sridhar
    • H01S3/00H04B10/17
    • H04B10/296
    • An optical communication device, and related method, are provided for reducing ripple in WDM systems. In particular, the optical communication device includes a dynamic gain equalization (DGE) circuit is coupled to an optical communication path carrying the WDM optical signals. The DGE circuit adjusts the powers associated with each channel on a channel-by-channel basis so that the WDM optical signal has a desired power spectrum. The DGE is controlled in response to sense signals generated by an optical performance monitoring (OPM) circuit located downstream from the DGE or substantially co-located with the DGE. The OPM monitors the WDM spectrum for optical signal power variations and outputs the sense signal when the variations fall outside a given tolerance. Typically, one DGE is associated with a group of concatenated amplifiers so that multiple DGEs are provided in a system having many groups of such amplifiers. Likewise, multiple OPMs are provided in such systems, each corresponding to a respective DGE, so that ripple can be reduced and desired WDM optical signal powers can be achieved in the WDM system.
    • 提供了一种光通信设备及相关方法,用于减少WDM系统中的纹波。 特别地,光通信设备包括动态增益均衡(DGE)电路耦合到承载WDM光信号的光通信路径。 DGE电路在逐个通道的基础上调整与每个通道相关联的功率,使得WDM光信号具有所需的功率谱。 响应由位于DGE下游的光学性能监视(OPM)电路产生的感测信号或与DGE基本上同一位置来控制DGE。 OPM监视WDM频谱的光信号功率变化,并在变化值超出给定公差时输出感测信号。 通常,一个DGE与一组级联放大器相关联,使得在具有许多这种放大器组的系统中提供多个DGE。 类似地,在这样的系统中提供多个OPM,每个对应于相应的DGE,使得纹波可以减少,并且可以在WDM系统中实现期望的WDM光信号功率。
    • 19. 发明授权
    • Optical service channel systems and methods over high loss links
    • 高损耗链路的光业务通道系统和方法
    • US08867912B2
    • 2014-10-21
    • US13606975
    • 2012-09-07
    • Balakrishnan SridharJun Bao
    • Balakrishnan SridharJun Bao
    • H04J14/02H04B10/08H04B17/00H04L12/26H04L12/413
    • H04J14/0275H04B10/071
    • Optical service channel (OSC) systems and methods over high loss links are described utilizing redundant telemetry channels. A first telemetry channel provides a low bandwidth communication channel used when Raman amplification is unavailable on a high loss link for supporting a subset of operations, administration, maintenance, and provisioning (OAM&P) communication. A second telemetry channel provides a high bandwidth communication channel for when Raman amplification is available to support full OAM&P communication. The first and second telemetry operate cooperatively ensuring nodal OAM&P communication over high loss links (e.g., 50 dB) regardless of operational status of Raman amplification.
    • 利用冗余遥测信道描述了通过高损耗链路的光服务信道(OSC)系统和方法。 当用于支持操作,管理,维护和供应(OAM&P)通信的子集的高损耗链路上拉曼放大不可用时,第一遥测通道提供低带宽通信信道。 第二个遥测通道提供高带宽通信信道,用于当拉曼放大可用于支持完整的OAM&P通信时。 第一和第二遥测工作协调地确保无论拉曼放大的操作状态如何,通过高损耗链路(例如,50dB)确保节点OAM&P通信。