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    Power Control in Bidirectional WDM Optical Link
    1.
    发明申请
    Power Control in Bidirectional WDM Optical Link 有权
    双向WDM光链路功率控制

    公开(公告)号：US20150304033A1

    公开(公告)日：2015-10-22

    申请号：US14647213

    申请日：2012-12-10

    申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)

    发明人： Luca Giorgi ,  Fabio Cavaliere ,  Fabio Falconi

    IPC分类号： H04B10/2507 ,  H04B10/27 ,  H04J14/02 ,  H04B10/25

    CPC分类号： H04B10/2507 ,  H04B10/2503 ,  H04B10/27 ,  H04B10/2972 ,  H04J14/02 ,  H04J14/0221

    摘要： A bidirectional WDM optical communications link has WDM signals sent in opposite directions along a shared optical path and using at least one common wavelength. An optical amplifier (20, 21, 22, 70, A1D, A2U, A2D) optically amplifies (144) a first WDM signal separately from a second WDM signal in the other direction. This separated optical amplification is controlled (134) according to indications of transmission quality at the common wavelength, to alter the relative optical powers of the first and second WDM signals to enable crosstalk at the common wavelength to be limited. Cross talk at the common wavelength can be improved by rebalancing relative amounts of cross talk in the different directions, to enable the capacity benefits of using a common wavelength for both directions to be obtained while using greater optical signal power. This is particularly useful where the optical power is asymmetric, such as in WDM PON systems.

    摘要翻译： 双向WDM光通信链路具有沿着共享光路并且使用至少一个公共波长沿相反方向发送的WDM信号。 光放大器（20,21,22,70，A1D，A2U，A2D）在另一个方向上与第二WDM信号分离地放大（144）第一WDM信号。 根据共同波长的传输质量的指示来控制（134）分离的光放大，以改变第一和第二WDM信号的相对光功率，以使公共波长的串扰受到限制。 可以通过在不同方向上重新平衡相互的串扰量来提高共同波长的串扰，以便在使用更大的光信号功率的同时获得使用两个方向的公共波长的容量优点。 这在光功率是不对称的情况下尤其有用，例如在WDM PON系统中。

    Power control in bidirectional WDM optical link
    4.
    发明授权
    Power control in bidirectional WDM optical link 有权

    公开(公告)号：US09634767B2

    公开(公告)日：2017-04-25

    申请号：US14647213

    申请日：2012-12-10

    申请人： Telefonaktiebolaget L M Ericsson (publ)

    发明人： Luca Giorgi ,  Fabio Cavaliere ,  Fabio Falconi

    IPC分类号： H04B10/00 ,  H04B10/2507 ,  H04J14/02 ,  H04B10/297 ,  H04B10/25 ,  H04B10/27

    CPC分类号： H04B10/2507 ,  H04B10/2503 ,  H04B10/27 ,  H04B10/2972 ,  H04J14/02 ,  H04J14/0221

    摘要： A bidirectional WDM optical communications link has WDM signals sent in opposite directions along a shared optical path and using at least one common wavelength. An optical amplifier (20, 21, 22, 70, A1D, A2U, A2D) optically amplifies (144) a first WDM signal separately from a second WDM signal in the other direction. This separated optical amplification is controlled (134) according to indications of transmission quality at the common wavelength, to alter the relative optical powers of the first and second WDM signals to enable crosstalk at the common wavelength to be limited. Cross talk at the common wavelength can be improved by rebalancing relative amounts of cross talk in the different directions, to enable the capacity benefits of using a common wavelength for both directions to be obtained while using greater optical signal power. This is particularly useful where the optical power is asymmetric, such as in WDM PON systems.

    Determining Asymmetries in a Communication Network
    5.
    发明申请
    Determining Asymmetries in a Communication Network 有权
    确定通信网络中的不对称性

    公开(公告)号：US20160105341A1

    公开(公告)日：2016-04-14

    申请号：US14874873

    申请日：2015-10-05

    申请人： Telefonaktiebolaget L M Ericsson (publ)

    发明人： Fabio Cavaliere ,  Giulio Bottari ,  Luca Giorgi ,  Stefano Ruffini

    IPC分类号： H04L12/26 ,  H04Q11/00 ,  H04B10/077

    CPC分类号： H04L43/0864 ,  H04B10/07 ,  H04B10/0775 ,  H04B10/0795 ,  H04B2210/072 ,  H04B2210/078 ,  H04J3/0667 ,  H04J14/0201 ,  H04J14/021 ,  H04J14/0226 ,  H04J14/0267 ,  H04J14/0273 ,  H04J14/0275 ,  H04Q11/0066 ,  H04Q2011/0083

    摘要： A method for measuring asymmetry in propagation delay of first and second links which connect a first node to a second node of a communication network. The method comprises measuring (101) a round trip delay of the first link. The round trip delay can be measured by transmitting (102) a test signal from the first node to the second node over the first link and receiving a reply to the test signal from the second node over the first link. The method further comprises measuring (105) a round trip delay of the second link. The round trip delay can be measured by transmitting (106) a test signal to the second node over the second link and receiving a reply to the test signal from the second node over the second link. A difference in the propagation delay of the first link with respect to the second link is determined (109) using the measured round trip delays of the first link and the second link.

    摘要翻译： 一种用于测量将第一节点连接到通信网络的第二节点的第一和第二链路的传播延迟不对称的方法。 该方法包括测量（101）第一链路的往返延迟。 可以通过在第一链路上将测试信号从第一节点发送（102）到第二节点（102）并通过第一链路接收来自第二节点的测试信号的答复来测量往返延迟。 该方法还包括测量（105）第二链路的往返延迟。 可以通过在第二链路上向第二节点发送（106）测试信号（106）并通过第二链路从第二节点接收对测试信号的回复来测量往返延迟。 使用所测量的第一链路和第二链路的往返延迟来确定第一链路相对于第二链路的传播延迟的差异（109）。