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    • 5. 发明申请
    • METHOD AND DEVICES FOR AUTOMATIC TUNING IN WDP-PON
    • WDP-PON自动调谐的方法与装置
    • US20120008958A1
    • 2012-01-12
    • US13257706
    • 2009-03-20
    • Stefan DahlfortPeter Ohlen
    • Stefan DahlfortPeter Ohlen
    • H04J14/02
    • H04J14/0226H04J14/0282
    • A system and method in a wavelength division multiplexing passive optical network is provided. A multiplexed optical downstream signal is transmitted from an optical line terminal to a passive distribution node. The signal is demultiplexed into a plurality of optical sub-signals. A sub-signal is transferred to an optical network termination. The received at least one sub-signal is identified. An optical wavelength of an upstream optical signal is set as a function of a predefined relationship between an optical wavelength of the received at least one sub-signal and the optical wavelength of the upstream signal. The upstream signal is transmitted to the optical line terminal via the passive distribution node.
    • 提供了一种波分复用无源光网络的系统和方法。 复用的光下行信号从光线路终端发送到被动分配节点。 信号被解复用为多个光子信号。 子信号被传送到光网络终端。 识别所接收的至少一个子信号。 上游光信号的光波长被设定为所接收的至少一个子信号的光波长和上游信号的光波长之间的预定关系的函数。 上行信号通过被动分配节点传输到光线路终端。
    • 7. 发明申请
    • Methods and Devices for Wavelength Alignment in WDM-PON
    • WDM-PON中波长对准的方法和设备
    • US20110236017A1
    • 2011-09-29
    • US13129741
    • 2009-11-30
    • Peter Ohlen
    • Peter Ohlen
    • H04B10/08H04J14/02
    • H04J14/0282H04B10/07955H04J14/0235
    • An optical network unit for a passive optical network (10), configured to: initiate an upstream wavelength (wus) for an upstream signal (US) from the optical network unit to an optical line terminal (10); iteratively, until an iteration criterion is met, i) transmit the upstream signal (US) to the optical line terminal (10), ii) receive from the optical line terminal (10) power level data (p) for the upstream signal (US) as measured by the optical line terminal (10), and iii) set the upstream wavelength (wus) for the upstream signal (US) to a new wavelength-value; and adjust the upstream wavelength (wus) to a wavelength-value previously set for the upstream signal (US) and associated with power level data corresponding to a certain power level. A passive optical network system, the optical line terminal and related methods are also disclosed.
    • 一种用于无源光网络(10)的光网络单元,用于:从所述光网络单元向光线路终端(10)发起用于上行信号(US)的上行波长(wus); 迭代地,直到满足迭代标准,i)将上行信号(US)发送到光线路终端(10),ii)从光线路终端(10)接收上行信号(US)的功率电平数据(p) ),并且iii)将上行信号(US)的上行波长(wus)设置为新的波长值; 并且将上游波长(wus)调整到先前为上行信号(US)设置的波长值,并且与对应于一定功率电平的功率电平数据相关联。 还公开了一种无源光网络系统,光线路终端及相关方法。
    • 8. 发明申请
    • Optimization of the decision threshold for binary signals
    • 优化二进制信号的判定阈值
    • US20050022077A1
    • 2005-01-27
    • US10488448
    • 2002-09-03
    • Peter Ohlen
    • Peter Ohlen
    • G06F11/00H04L1/20H04L25/06
    • H04L25/063H04L1/20
    • A threshold value is set in a decision circuit (9) receiving a transmitted stream of binary symbols from a network link. The decision circuit uses the threshold value for detecting whether a 1 or a 0 is received to produce an output stream having a low bit error rate. Bit errors in the output stream of the detector are detected (35). The number of errors is counted when a transmitted 0 is detected to give a 1 in the output stream. The number of errors is also counted when a transmitted 1 is detected to give a 0 in the output stream. The counted numbers of errors are compared to each other. The threshold value is then modified, if necessary, as given by the result of the comparing, to e.g. make the probabilities of the two kinds of errors equal to each other. Extra predetermined bits can be inserted (31) that are used in determining the bit errors. This method of setting the threshold value gives small bit error rates in the output signal.
    • 在从网络链路接收二进制符号的发送流的判定电路(9)中设定阈值。 判定电路使用阈值来检测是否接收到1或0以产生具有低位错误率的输出流。 检测出输出流中的位错误(35)。 当检测到发送的0以在输出流中给出1时,计数错误的数量。 当检测到发送的1以在输出流中给出0时,还计数错误的数量。 将计数的错误数相互比较。 然后如果需要,将阈值修改为由比较结果给出的阈值。 使两种错误的概率相互相等。 可以插入额外的预定位(31),用于确定位错误。 这种设置阈值的方法在输出信号中产生较小的误码率。