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    • 84. 发明授权
    • Optical signal receiver and method with decision threshold adjustment based on a total percentage error indicator field of the invention
    • 光信号接收机和基于本发明总百分比误差指示字段的判定阈值调整方法
    • US06885828B1
    • 2005-04-26
    • US09916867
    • 2001-07-27
    • Steve W. Cornelius
    • Steve W. Cornelius
    • H04B10/02H04B10/08H04B10/158H04B10/06
    • H04L25/063H04B10/07953H04B10/0799H04B10/695
    • An optical receiver configuration and method of controlling an optical signal receiver adjusts a decision threshold to reduce the bit error rate (BER). The receiver includes a comparator having a data input and a digital data output. An error detection & correction circuit provides an error signal representative of the number of corrected “1”s and “0”s in the data output from the comparator. Based on the error signal, a control circuit modifies the comparator decision threshold in a direction to reduce the BER of the receiver. Dynamic modification of the decision threshold may also be accomplished. A total percentage error indicator is preferably used as the basis of changing the decision threshold value. The total percentage error indicator may be used to variably adjust the decision threshold by an amount that varies according to the magnitude of the total percentage error indicator to thereby more quickly arrive at an acceptable decision threshold and prevent overshoot. A searching method may also be used to determine the usable range of the comparator before tuning the decision threshold.
    • 控制光信号接收机的光接收器配置和方法调节判决阈值以减小误码率(BER)。 接收机包括具有数据输入和数字数据输出的比较器。 错误检测和校正电路提供表示从比较器输出的数据中校正的“1”和“0”的数量的误差信号。 基于误差信号,控制电路在降低接收机的BER的方向上修改比较器判定阈值。 也可以实现决策阈值的动态修改。 优选地使用总百分比误差指示符作为改变判定阈值的基础。 可以使用总百分比误差指示符来可变地调整判定阈值一定量,该量根据总百分比误差指示符的大小而变化,从而更快地达到可接受的判定阈值并防止过冲。 在调整判定阈值之前,还可以使用搜索方法来确定比较器的可用范围。
    • 89. 发明申请
    • Optical equalizer for intersymbol interference mitigation
    • 用于符号间干扰减轻的光均衡器
    • US20050058459A1
    • 2005-03-17
    • US10922690
    • 2004-08-19
    • Sethumadhavan ChandrasekharAndrew ChraplyvyChristopher DoerrPeter Winzer
    • Sethumadhavan ChandrasekharAndrew ChraplyvyChristopher DoerrPeter Winzer
    • G02F1/01G02B6/26H04B10/02H04B10/18H04J14/00H04J14/02H04B10/00
    • H04B10/2507G02B6/266H04J14/0221
    • A multi-channel optical equalizer for intersymbol interference mitigation compensates for single- or multi-wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer also compensates for overshoots and signal transition degradations in semiconductor optical amplifiers. The equalizer unit uses one control signal for magnitude and one to control signal phase. The equalizer includes a controllable coupling ratio coupler for splitting the light into two portions and a controllable interferometer having two arms, one arm having an additional delay which is equal to an integer multiple of 1/Δf, where Δf is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. A multistage optical equalizer is implemented using a plurality of optical signal equalizers.
    • 用于符号间干扰减轻的多通道光学均衡器同时补偿单波长或多波长通道,并且需要很少的可调参数。 光学均衡器还补偿半导体光放大器中的过冲和信号转换劣化。 均衡器单元使用一个控制信号的幅度和一个来控制信号相位。 均衡器包括可控耦合比耦合器,用于将光分成两部分,以及具有两个臂的可控干涉仪,一个臂具有等于1 / Deltaf的整数倍的附加延迟,其中Deltaf是相邻波长之间的信道间隔 用于光学系统。 可控干涉仪在第一或第二臂中具有可控制的延迟,用于调节通过其中的光的相对相位。 耦合器组合来自第一和第二臂的两个信号部分以形成均衡的输出信号。 使用多个光信号均衡器来实现多级光学均衡器。
    • 90. 发明申请
    • Method and apparatus to reduce second order distortion in optical communications
    • 降低光通信二阶失真的方法和装置
    • US20050047799A1
    • 2005-03-03
    • US10649007
    • 2003-08-26
    • Frederic CoppingerLiPing ChenDavid Piehler
    • Frederic CoppingerLiPing ChenDavid Piehler
    • H04B10/02H04B10/00H04B10/155H04B10/18H04J1/12H04J14/00H04J14/02H04B10/04
    • H04J1/12H04B10/2507H04B2210/258H04J14/02H04J14/0298
    • Method and apparatus to reduce composite second order (CSO) non-linearity and/or dispersion degradation in multi-wavelength optical communications systems. Optical communication systems using optical fibers are prone to suffer from undesirable distortion due to composite second order distortion caused by self phase modulation, cross phase modulation, and the optical Kerr effect in conjunction with polarization dependence loss. Introduction of a delay (phase shift) between the two optical signals in a dual optical signal system has been found to reduce or suppress the composite second order distortion. The delay shift is provided in either the electrical (RF) mode or in the optical mode. This delay is typically provided in a transmitter or a repeater in an optical system. The typical amount of the delay is half a wavelength of the high frequency RF modulation or for a typical system operating with RF signal up to 550 MHz, one nanosecond of delay. This amount of delay can be provided with approximately a 20 centimeter length of optical fiber in the transmitter. This delay is applied to only one of the two wavelengths, thus providing the desired phase shift.
    • 降低多波长光通信系统中复合二阶(CSO)非线性和/或色散劣化的方法和装置。 使用光纤的光通信系统由于由自相位调制,交叉相位调制和光学克尔效应以及偏振相关损耗引起的复合二阶失真,容易受到不期望的失真的影响。 已经发现在双光信号系统中引入两个光信号之间的延迟(相移)来减少或抑制复合二阶失真。 延迟移位以电(RF)模式或光模式提供。 该延迟通常在光学系统中的发射机或中继器中提供。 典型的延迟量是高频RF调制的一半波长,或者对于高达550MHz的RF信号的典型系统,延迟为一纳秒。 可以在发射机中提供大约20厘米长的光纤的延迟量。 该延迟仅应用于两个波长中的一个,从而提供期望的相移。