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1. 发明申请

US20060153574A1 Fiber optical system for PMD mitigation by polarization scrambling 失效
标题翻译：用于通过偏振加扰来减少PMD的光纤光学系统
公开(公告)号：US20060153574A1
公开(公告)日：2006-07-13
申请号：US11298499
申请日：2005-12-12
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04B10/00
CPC分类号： H04B10/2569
摘要： A fiber optical system (10) for transmitting an optical signal comprises an optical fiber line (1) with a plurality of successively arranged polarization scramblers (6a to 6c) for polarization modulation of the optical signal transmitted through the optical fiber line (1) and a reference frequency signal (11) which synchronizes scrambling frequencies of all of the polarization scramblers (6a to 6c) to a common reference frequency.
摘要翻译：用于发送光信号的光纤系统（10）包括具有多个连续排列的偏振加扰器（6a至6c）的光纤线路（1），用于通过光纤线路（1）传输的光信号的偏振调制）和参考频率信号（11），其将所有偏振加扰器（6a至6c）的加扰频率同步到公共参考频率。

2. 发明申请

US20060056547A1 Analog/digital conversion with adjustable thresholds 审中-公开
标题翻译：具有可调节阈值的模拟/数字转换
公开(公告)号：US20060056547A1
公开(公告)日：2006-03-16
申请号：US11218649
申请日：2005-09-06
申请人： Fred Buchali , Henning Bulow , Bernd Franz
发明人： Fred Buchali , Henning Bulow , Bernd Franz
IPC分类号： H03D1/00
CPC分类号： H03M1/186 , H03M1/069
摘要： A device for receiving a distorted signal, in particular an optical signal converted by an opto/electrical converter, comprises an analog/digital converter (1) with adjustable thresholds and a Viterbi equalizer (10). The device further comprises a histogram estimator (13) for determining a probability density function of the distorted signal and a threshold estimator (4) for dynamically adjusting at least one threshold of the analog/digital converter (1) in an overlap region of a first signal amplitude attributed to a first symbol (σ10, X10) and a second signal amplitude attributed to a second symbol (σ11, X11) of the probability density function.
摘要翻译：用于接收失真信号的设备，特别是由光/电转换器转换的光信号，包括具有可调阈值的模拟/数字转换器（1）和维特比均衡器（10）。所述设备还包括用于确定所述失真信号的概率密度函数的直方图估计器（13）和用于在第一和第二信号的重叠区域中动态地调整所述模拟/数字转换器（1）的至少一个阈值的阈值估计器（4）归因于第一符号（西格玛，10）的信号幅度和归因于第二符号的第二信号幅度（西格玛11，X 11概率密度函数。

3. 发明申请

US20050041986A1 Optical transmission method and optical receiver 有权
标题翻译：光传输方式和光接收机
公开(公告)号：US20050041986A1
公开(公告)日：2005-02-24
申请号：US10873359
申请日：2004-06-23
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04B10/2507 , H04B10/69 , H04L25/03 , H04B10/06
CPC分类号： H04B10/6971 , H04B10/2507 , H04B10/697 , H04L25/03006 , H04L2025/03789
摘要： An optical receiver has an adaptive optical compensator and/or an adaptive electrical equalizer for compensating signal distortion in a received optical signal. In order to achieve a very fast adaptation of the receiver to the actual signal distortion, which is important for example for bursts mode optical signals in a packet-switched optical transmission network, at least one predetermined trainings sequence is provided in the optical signal, which is known at the receiver and thus enables fast adaptation of the compensator and/or equalizer to the actual signal distortion.
摘要翻译：光接收机具有用于补偿接收的光信号中的信号失真的自适应光补偿器和/或自适应电均衡器。为了实现将接收机非常快速地适应于实际信号失真，这对于分组交换光传输网络中的突发模式光信号是重要的，在光信号中提供至少一个预定的训练序列，在接收机处是已知的，因此使补偿器和/或均衡器能够快速适应实际的信号失真。

4. 发明申请

US20070183550A1 Clock recovery circuit and method for optical receiver 审中-公开
标题翻译：光接收机的时钟恢复电路及方法
公开(公告)号：US20070183550A1
公开(公告)日：2007-08-09
申请号：US11640937
申请日：2006-12-19
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04L7/00
CPC分类号： H04L7/0075 , H04B10/66 , H04L7/027 , H04L7/033
摘要： A clock recovery circuit (1a) for a digital signal (DS) comprising a clock signal and a high-frequency jitter component due to polarisation scrambling in the optical domain. The proposed clock recovery circuit comprises: a first clock recovery sub-circuit (5) adapted to generate a first auxiliary clock signal (CS1) with said high-frequency jitter component at least partly removed, a second clock recovery sub-circuit (6) adapted to generate a second auxiliary clock signal (CS2) still comprising said high-frequency jitter component, a phase comparator (7) connected with the first and second clock recovery sub-circuits and adapted to compare respective phases of the first and second auxiliary clock signals to produce a high-frequency jitter signal (JS, JS′) depending on a phase difference between the first and second auxiliary clock signals, and a phase modulator (8) connected with the first clock recovery sub-circuit and the phase comparator and adapted to modulate a phase of the first auxiliary clock signal with the high-frequency jitter signal to generate a recovered clock signal (CS). The above-described circuit provides distortion and jitter tolerant clock recovery for optical receivers.
摘要翻译：一种用于数字信号（DS）的时钟恢复电路（1a），包括由于光学域中的偏振加扰引起的时钟信号和高频抖动分量。所提出的时钟恢复电路包括：第一时钟恢复子电路（5），适于产生具有至少部分去除的所述高频抖动分量的第一辅助时钟信号（CS 1）;第二时钟恢复子电路（6））适于产生仍然包括所述高频抖动分量的第二辅助时钟信号（CS 2），与所述第一和第二时钟恢复子电路连接并且适于比较所述第一和第二时钟恢复子电路的各个相位的相位比较器（7）辅助时钟信号，以根据第一和第二辅助时钟信号之间的相位差产生高频抖动信号（JS，JS'），以及与第一时钟恢复子电路和相位相连的相位调制器（8）比较器，并适于用高频抖动信号调制第一辅助时钟信号的相位，以产生恢复的时钟信号（CS）。上述电路为光接收机提供失真和抖动容忍时钟恢复。

5. 发明申请

US20050254749A1 Multi-wavelength CD and PMD compensator 失效
标题翻译：多波长CD和PMD补偿器
公开(公告)号：US20050254749A1
公开(公告)日：2005-11-17
申请号：US11097325
申请日：2005-04-04
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04B10/2507 , H04B10/2513 , G02B6/26
CPC分类号： H04B10/2572 , H04B10/2513
摘要： The present invention concerns a method for performing optical dispersion compensation of wavelength division multiplexed (WDM) optical signals. The method comprises the steps of providing a compensation stage with an optical transmission medium to be used as parallel operating cascade of polarization controllers and optical birefringent elements to compensate dispersion of the WDM optical signals when being transmitted spectrally dispersed into the different wavelength channels in parallel through the parallel cascades. The method is being characterized by determining the chromatic dispersion of the optical signals at one or few different wavelength channels possibly allowing an extrapolation of the chromatic dispersion to the other wavelength channels for defining accordingly an additional feedback signal to be used for the polarization controller setting.
摘要翻译：本发明涉及一种用于执行波分复用（WDM）光信号的光色散补偿的方法。该方法包括以下步骤：提供具有光传输介质的补偿级，以用作偏振控制器和光学双折射元件的并联操作级联，以在通过光谱分散到不同波长信道中并行传输时，补偿WDM光信号的色散并联级联。该方法的特征在于确定一个或几个不同波长信道处的光信号的色散，可能允许将色散外推到其他波长信道，以便相应地定义要用于偏振控制器设置的附加反馈信号。

6. 发明授权

US5453872A Fiber-optic amplifier as wavelength converter 失效
标题翻译：光纤放大器作为波长转换器
公开(公告)号：US5453872A
公开(公告)日：1995-09-26
申请号：US280840
申请日：1994-07-26
申请人： Rolf Heidemann , Henning Bulow , Thomas Pfeiffer
发明人： Rolf Heidemann , Henning Bulow , Thomas Pfeiffer
IPC分类号： H01S3/067 , H01S3/16 , H04B10/291 , H01S3/106 , G02F1/39 , H01S3/0933
CPC分类号： H04B10/291 , H01S3/06754 , H04B10/2912 , H01S3/1608
摘要： An optical system includes a fiber-optic amplifier having a section of optical waveguide doped with a rare-earth element and a pump-light source for emitting pump light, the fiber-optic amplifier receiving signal light of a first wavelength and outputting at least signal light of a second wavelength. An optical-to-electrical transducer receives the signal light of the second wavelength from the fiber-optic amplifier and produces an electrical output signal. The signal light of the second wavelength is pump light which is unabsorbed in the section of optical waveguide.
摘要翻译：光学系统包括具有掺杂有稀土元素的光波导部分和用于发射泵浦光的泵浦光源的光纤放大器，该光纤放大器接收第一波长的信号光并至少输出信号第二波长的光。光电换能器从光纤放大器接收第二波长的信号光，并产生电输出信号。第二波长的信号光是在光波导部分中未被吸收的泵浦光。

7. 发明授权

US5442479A Fiber-optic amplifier with a facility for monitoring the pump power and input power 失效
标题翻译：具有监测泵功率和输入功率的设备的光纤放大器
公开(公告)号：US5442479A
公开(公告)日：1995-08-15
申请号：US264961
申请日：1994-06-24
申请人： Henning Bulow , Jurgen Otterbach
发明人： Henning Bulow , Jurgen Otterbach
IPC分类号： G02F1/35 , G01M11/00 , H01S3/067 , H04B10/00 , H04B10/02 , H04B10/079 , H04B10/08 , H04B10/17 , H04B10/291
CPC分类号： H04B10/291 , H01S3/06754 , H04B10/07955 , H04B10/0797 , H01S2301/02 , H04B2210/08
摘要： In fiber-optic amplifiers, various parameters, such as the input power, are measured to obtain information on the operating condition of the transmission link and of the fiber-optic amplifier itself. In prior art fiber-optic amplifiers, a portion of the input power is coupled out for this purpose by means of a coupler (2). If low-power optical signals such as digital signals are transmitted, the coupled-out portion of the input power can only be detected with complicated and costly circuitry. In the novel fiber-optic amplifier, the pump power and input power are monitored by coupling out and evaluating the radiation resulting from amplified spontaneous emission (ASE). This provides information on the state of the input signal.
摘要翻译：在光纤放大器中，测量诸如输入功率的各种参数以获得关于传输链路和光纤放大器本身的操作条件的信息。在现有技术的光纤放大器中，输入功率的一部分通过耦合器（2）耦合到该目的。如果发射诸如数字信号的低功率光信号，则只能用复杂和昂贵的电路检测输入功率的耦合输出部分。在新型光纤放大器中，泵浦功率和输入功率通过耦合输出和评估由放大的自发发射（ASE）产生的辐射来监测。这提供了有关输入信号状态的信息。

8. 发明申请

US20100014873A1 Adaptive non-linearity compensation in coherent receiver 审中-公开
标题翻译：相干接收机中的自适应非线性补偿
公开(公告)号：US20100014873A1
公开(公告)日：2010-01-21
申请号：US12459511
申请日：2009-07-02
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04B10/00 , H04B10/158 , H04J14/06
CPC分类号： H04B10/6161 , H04B10/6165 , H04B10/6971
摘要： The invention relates to optical communication, in particular to compensation of non-linear distortions incurred in high bit-rate optical communication systems. A method and system for compensating self-phase modulation at an optical receiver of an optical transmission system using polarization division multiplexing and a modulation scheme with constant amplitude is proposed. The method comprises the step of performing a phase modulation on a received signal, wherein the received signal comprises two signal components associated with two orthogonal polarizations, each component comprising an in-phase sub-component and a quadrature-phase sub-component, thereby spanning a four-dimensional space. The phase modulation is determined by evaluating an error signal which depends on the distance in the four-dimensional space between the received signal after the phase modulation and a four-dimensional sphere defined by target constellation points of the optical transmission system.
摘要翻译：本发明涉及光通信，特别涉及在高比特率光通信系统中引起的非线性失真的补偿。提出了一种使用偏振分复用的光传输系统的光接收机和具有恒定幅度的调制方案来补偿自相位调制的方法和系统。该方法包括对接收信号执行相位调制的步骤，其中接收信号包括与两个正交偏振相关联的两个信号分量，每个分量包括同相子分量和正交相位子分量，从而跨越一个四维空间。通过评估取决于相位调制后的接收信号与由光传输系统的目标星座点定义的四维球之间的四维空间中的距离的误差信号来确定相位调制。

9. 发明申请

US20060177220A1 Performance monitoring for optical links 有权
标题翻译：光链路性能监控
公开(公告)号：US20060177220A1
公开(公告)日：2006-08-10
申请号：US11302259
申请日：2005-12-14
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04B10/08
CPC分类号： H04B10/00 , H04L25/03178
摘要： A method for estimating at least one optical link parameter using a Viterbi equalizer (1) generating averaged values (M) of signal amplitudes of a distorted optical signal transmitted through an optical link (2) for a set of decided bit patterns (a, b, c, d, . . . ), the method comprising the following steps: forming a first parameter set (S) characteristic of a distorted signal sequence using the averaged values (M(a), M(b), M(d), M(g)) for a given sequence (abdg) of bit patterns (a, b, c, d, . . . ), comparing the first parameter set (S) to a plurality of reference parameter sets (R1, R2, . . . ) characteristic for reference signal sequences of the same sequence (abdg) of bit patterns (a, b, c, d, . . . ), each of the reference parameter sets (R1, R2, . . . ) having a known value of the at least one optical link parameter, and selecting the reference parameter set (R) with the closest correlation to the first parameter set (S), the known value of the at least one optical link parameter of the selected reference parameter set (R) being used as an estimate for the at least one optical link parameter. A computer program product comprising a software or a hardware implementing the method.
摘要翻译：一种用于使用维特比均衡器（1）来估计至少一个光链路参数的方法，该维特比均衡器产生通过光链路（2）发射的失真光信号的信号幅度的平均值（M），用于确定的位模式（a，b）该方法包括以下步骤：使用平均值（M（a），M（b），M（d））形成失真信号序列特征的第一参数集（S）（a，b，c，d，...）的给定序列（abdg），将第一参数组（S）与多个参考参数组（R 1，R （a，b，c，d，...）的相同序列（abdg）的参考信号序列的特征，每个参考参数组（R 1，R 2，...，）具有所述至少一个光学链路参数的已知值，并且选择与所述第一参数集（S）最相关的所述参考参数集合（R），所述至少一个光学链路参数的已知值所选择的参考参数集（R）的链路参数被用作所述至少一个光链路参数的估计。一种包括执行该方法的软件或硬件的计算机程序产品。

10. 发明申请

US20060153575A1 Receiver for PMD mitigation by polarization scrambling 失效
标题翻译：接收器通过极化扰频减轻PMD
公开(公告)号：US20060153575A1
公开(公告)日：2006-07-13
申请号：US11296515
申请日：2005-12-08
申请人： Henning Bulow
发明人： Henning Bulow
IPC分类号： H04B10/00
CPC分类号： H04B10/2572
摘要： A receiver (10) for an optical signal containing a time jitter and a time-varying distortion caused by a periodic polarization scrambled signal comprises at least one decision gate (11) and a clock recovery module (13) providing a clock signal (C) recovered from the optical signal to the at least one decision gate (11). The receiver (10) further comprises a scrambling frequency generator (16) synchronized to the scrambling frequency and phase of the polarization scrambled signal, a jitter function generator (17) generating a clock phase control signal (Δφb) reproducing the time jitter, and at least one clock phase modulator (14) modulating the phase of the clock signal (C) according to the clock phase control signal (Δφb).
摘要翻译：用于包含由周期性偏振加扰信号引起的时间抖动和时变失真的光信号的接收器（10）包括提供时钟信号（C）的至少一个判定门（11）和时钟恢复模块（13）从所述光信号恢复到所述至少一个判定门（11）。接收器（10）还包括与偏振加扰信号的加扰频率和相位同步的加扰频率发生器（16），抖动函数发生器（17）产生时钟相位控制信号（Deltaphi B＆）和至少一个时钟相位调制器（14），其根据时钟相位控制信号（Deltaphi B b）调制时钟信号（C）的相位。

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