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    Monitoring and in-line compensation of polarization dependent loss for lightwave systems
    7.
    发明授权
    Monitoring and in-line compensation of polarization dependent loss for lightwave systems 失效
    光波系统偏振相关损耗的监测和在线补偿

    公开(公告)号：US07206517B1

    公开(公告)日：2007-04-17

    申请号：US10099875

    申请日：2002-03-15

    申请人： Qian Yu ,  Lianshan Yan ,  Alan E. Willner

    发明人： Qian Yu ,  Lianshan Yan ,  Alan E. Willner

    IPC分类号： H04B10/00

    CPC分类号： H04B10/2572

    摘要： A multi-wavelength optical signal copropagates through a fiber-optic communication link with a continuous-wave ancillary wavelength having an unknown state of polarization (SOP), which is scrambled periodically in time. The instantaneous value of polarization dependent loss (PDL) in the ancillary wavelength is monitored in real time, and is used as an error signal to adjust at least one polarization controller. Polarization scrambling is performed by periodically changing the SOP with time, such that the polarization-scrambled optical signal covers approximately an entire Poincaré sphere surface, preferably uniformly, during each time period. At an optical node between fibers, an adjustable PDL compensator contains two ordered pairs each consisting of one polarization controller and one optical element introducing fixed PDL.

    摘要翻译： 多波长光信号通过具有未知极化状态（SOP）的连续波辅助波长的光纤通信链路共同繁殖，其周期性地被加扰。 在实时监测辅助波长偏振相关损耗（PDL）的瞬时值，并用作误差信号来调节至少一个偏振控制器。 通过周期性地改变SOP随时间进行极化加扰，使得偏振加扰的光信号在每个时间段期间大致整个Poincaré球面，优选地均匀地覆盖。 在光纤之间的光节点处，可调PDL补偿器包含两个有序对，每对由一个偏振控制器和一个引入固定PDL的光学元件组成。

    Sweep-Free Stimulated Brillouin Scattering-Based Fiber Optical Sensing
    9.
    发明申请
    Sweep-Free Stimulated Brillouin Scattering-Based Fiber Optical Sensing 有权
    基于无扫描的布里渊散射光纤光学传感

    公开(公告)号：US20130025374A1

    公开(公告)日：2013-01-31

    申请号：US13411390

    申请日：2012-03-02

    申请人： Asher Voskoboinik ,  Alan E. Willner ,  Moshe Tur

    发明人： Asher Voskoboinik ,  Alan E. Willner ,  Moshe Tur

    IPC分类号： G01D5/32

    CPC分类号： G01D5/35364 ,  G01D5/35303 ,  G01D5/35387

    摘要： Methods and systems used to perform sweep-free stimulated Brillouin scattering-based fiber optical sensing are described. In one aspect, a method includes interrogating different parts of a Brillouin gain spectrum using multiple optical tones in an optical fiber. The interrogating includes sending at least two pump tones into the optical fiber from one end of the optical fiber, such that a frequency spacing between the pump tones is larger than a width of the Brillouin gain spectrum. The interrogating also includes sending at least two probe tones into the optical fiber from another end of the optical fiber, such that a frequency spacing between the probe tones is different from the frequency spacing between the pump tones. The method further includes generating a sensing output based on the interrogating.

    摘要翻译： 描述了用于执行无扫描受激布里渊散射的光纤传感的方法和系统。 在一个方面，一种方法包括使用光纤中的多个光学色调来询问布里渊增益谱的不同部分。 询问包括从光纤的一端发送至少两个泵浦音调到光纤中，使得泵浦频率之间的频率间隔大于布里渊增益频谱的宽度。 询问还包括从光纤的另一端发送至少两个探测音调到光纤中，使得探测音之间的频率间隔与泵音之间的频率间隔不同。 该方法还包括基于询问产生感测输出。