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    Ultra-fast tunable optical filters
    1.
    发明授权
    Ultra-fast tunable optical filters 有权

    公开(公告)号：US06222964B1

    公开(公告)日：2001-04-24

    申请号：US09230959

    申请日：1999-04-08

    申请人： Dan Sadot ,  Daniel Majer ,  Eyal Shekel

    发明人： Dan Sadot ,  Daniel Majer ,  Eyal Shekel

    IPC分类号： G02B626

    CPC分类号： G02F1/225

    摘要： An optical filter including at least one multiport optical coupler formed on a gallium arsenide substrate, one connection port of the at least one multiport optical coupler receiving an input optical signal, and another connection port of the at least one multiport optical coupler outputting a filtered optical signal and at least one electrically tunable optical resonator, formed on the gallium arsenide substrate and connected to at least one of the at least multiport optical coupler.

    Spectral and temporal stealthy fiber optic communication using sampling and phase encoding detection systems
    2.
    发明授权
    Spectral and temporal stealthy fiber optic communication using sampling and phase encoding detection systems 有权
    使用采样和相位编码检测系统的光谱和时间隐形光纤通信

    公开(公告)号：US09288045B2

    公开(公告)日：2016-03-15

    申请号：US14232655

    申请日：2012-07-17

    申请人： Dan Sadot ,  Zeev Zalevsky ,  Tomer Yeminy

    发明人： Dan Sadot ,  Zeev Zalevsky ,  Tomer Yeminy

    IPC分类号： H04L9/08 ,  H04B10/85 ,  H04K1/04 ,  H04K1/00

    CPC分类号： H04L9/0852 ,  H04B10/85 ,  H04K1/006 ,  H04K1/04

    摘要： A method for providing spectral and temporal stealthy information transmitted over an optical communication channel, according to which, at the transmitting side, the power spectral density of a pulse sequence bearing the information is reduced by encrypting the temporal phase of the pulse sequence. The power of the pulse sequence is spread in the frequency domain, to be below the noise level, by sampling the pulse sequence. Spectral phase encoding is used to temporally spread the pulse sequence and to prevent coherent addition of its spectral replicas in frequency domain. The resulting signal, encrypted both in time and frequency domains, is then transmitted. Spectral phase decoding is performed at the receiving side by performing coherent detection and folding all the spectral replicas of the transmitted signal to the baseband by means of sampling. The temporal phase of the signal is decrypted and the information which is delivered by the pulse sequence is decoded.

    摘要翻译： 一种用于提供通过光通信信道发送的频谱和时间隐形信息的方法，根据该方法，在发送侧，通过加密脉冲序列的时间相位来减少携带信息的脉冲序列的功率谱密度。 通过采样脉冲序列，脉冲序列的功率在频域中扩展，低于噪声电平。 频谱相位编码用于时间扩展脉冲序列，并防止其频域中的频谱复制的相干相加。 随后发送在时域和频域加密的结果信号。 通过执行相干检测并通过采样将发射信号的所有光谱复制品折叠到基带，在接收侧执行光谱相位解码。 信号的时间相位被解密，并且由脉冲序列传送的信息被解码。

    METHOD AND SYSTEM FOR COHERENT EQUALIZATION OF CHROMATIC DISPERSION OF OPTICAL SIGNALS IN A FIBER
    3.
    发明申请
    METHOD AND SYSTEM FOR COHERENT EQUALIZATION OF CHROMATIC DISPERSION OF OPTICAL SIGNALS IN A FIBER 有权
    用于光纤中光信号的色散均匀化的方法和系统

    公开(公告)号：US20120251112A1

    公开(公告)日：2012-10-04

    申请号：US13515397

    申请日：2010-12-13

    申请人： Dan Sadot ,  Gilad Katz ,  Alik Gorshtein ,  Omri Levi

    发明人： Dan Sadot ,  Gilad Katz ,  Alik Gorshtein ,  Omri Levi

    IPC分类号： H04B10/18 ,  H04J14/06

    CPC分类号： H04B10/613 ,  H04B10/616

    摘要： Method and system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B. A receiving end with IQ paths receives signals and a balanced detector detects signals in each path. The bandwidth of the detected signals is reduced by a factor of N by filtering the output of each path using an AAF with a cutoff frequency optimized to the analog bandwidth 2B/N of each path, where the AAF has deterministic attributes and introducing Known ISI. The signal is sampled at the AAF output by an ADC, at a sampling rate of 2B/N. The samples of each path are post-processed by a digital processor operating at a data rate of 2B/N, where post-processing represents the compensation of the distortion and the input data stream is reconstructed by optimally decoding the output of the processor using a decoder, which compensates the ISI.

    摘要翻译： 用于以给定的模拟带宽B最佳地平衡携带相干光信号的光数据通道的失真的方法和系统。具有IQ路径的接收端接收信号，并且平衡检测器检测每个路径中的信号。 通过使用针对每个路径的模拟带宽2B / N优化的截止频率的AAF对每个路径的输出进行滤波来将检测到的信号的带宽减小N倍，其中AAF具有确定性属性并引入已知的ISI。 信号在ADC的AAF输出采样，采样率为2B / N。 每个路径的采样由以2B / N的数据速率操作的数字处理器进行后处理，其中后处理表示失真的补偿，并且通过使用以下步骤对处理器的输出进行最佳解码来重构输入数据流 解码器，可以补偿ISI。

    Optical CDMA by Self Heterodyne Filtering
    4.
    发明申请
    Optical CDMA by Self Heterodyne Filtering 审中-公开
    自适应滤波光CDMA

    公开(公告)号：US20090269064A1

    公开(公告)日：2009-10-29

    申请号：US11908072

    申请日：2006-03-10

    申请人： Yehezkel Joseph ,  Dan Sadot

    发明人： Yehezkel Joseph ,  Dan Sadot

    IPC分类号： H04J14/00

    CPC分类号： H04J14/005

    摘要： A new method and system for Optical Code Division Multiple Access (OCDMA) transmission, in which channel selection and rejection are based on dynamic self-heterodyne filtering using differential time delays applied to the data-modulated signals to code and decode the transmissions in each channel. Mach-Zender Interferometers having characteristic delays between their arms are a simple way of performing this coding and decoding. The technique enables the use of narrow linewidth sources and low spectrum spreading. Consequently this technique can be used in next-generation all-optical dynamic networks allowing bandwidth sharing on the one hand, while at the same time eliminating the need for network management and optical switching. Preliminary theoretical calculations predict the system support of up to 15 channels at a data rate of 1 GHz.

    摘要翻译： 一种用于光码分多址（OCDMA）传输的新方法和系统，其中信道选择和拒绝基于动态自外差滤波，其使用应用于数据调制信号的差分时间延迟来对每个信道中的传输进行编码和解码 。 具有臂之间的特征延迟的Mach-Zender干涉仪是执行该编码和解码的简单方式。 该技术使得能够使用窄线宽源和低频谱扩展。 因此，这种技术可以用于下一代全光纤动态网络，一方面允许带宽共享，同时消除对网络管理和光交换的需要。 初步理论计算预测了以1 GHz的数据速率对多达15个信道的系统支持。

    Measurement of wavelength transients in tunable lasers
    5.
    发明申请
    Measurement of wavelength transients in tunable lasers 失效
    可调激光器中波长瞬变的测量

    公开(公告)号：US20050180470A1

    公开(公告)日：2005-08-18

    申请号：US11034991

    申请日：2005-01-12

    申请人： Dan Sadot ,  Yehezkel Joseph

    发明人： Dan Sadot ,  Yehezkel Joseph

    IPC分类号： G01J9/02 ,  H01S3/10 ,  H01S5/00 ,  H01S5/062

    CPC分类号： H01S5/0014 ,  G01J9/0246 ,  H01S5/0622

    摘要： A high resolution measurement method and apparatus for tracking wavelength transients in tunable lasers. The apparatus comprises a Mach-Zehnder interferometer (MZI) which is used to generate a self-heterodyne signal between the wavelength transient to be measured, which is effectively the laser signal passed along the time-delayed arm of the MZI, and the laser wavelength after the tuning transient has subsided, which is effectively the same laser signal passed along the direct arm of the MZI. The heterodyne signal is detected on a receiver, and can then be measured with the frequency resolution typical of electronic measurements, such as by means of an oscilloscope. The only laser required is the laser under inspection. The wavelength measurement accuracy is up to twice the laser linewidth, and is only effectively limited by the laser phase noise. The method can be used to implement an automatic frequency control system for tunable lasers.

    摘要翻译： 用于跟踪可调激光器中的波长瞬变的高分辨率测量方法和装置。 该装置包括马赫 - 曾德干涉仪（MZI），该干涉仪用于在被测量的波长瞬态之间产生自我外差信号，这实际上是沿着MZI的延时臂传递的激光信号和激光波长 在调谐瞬变已经消退之后，这是有效的相同的激光信号通过MZI的直臂。 在接收机上检测外差信号，然后可以用例如借助于示波器的电子测量的典型的频率分辨率来测量外差信号。 所需的唯一激光是检查中的激光。 波长测量精度高达激光线宽的两倍，仅受激光相位噪声的有效限制。 该方法可用于实现可调激光器的自动频率控制系统。

    Method and system for coherent equalization of chromatic dispersion of optical signals in a fiber
    7.
    发明授权
    Method and system for coherent equalization of chromatic dispersion of optical signals in a fiber 有权
    光纤中信号色散相干均衡的方法和系统

    公开(公告)号：US09537578B2

    公开(公告)日：2017-01-03

    申请号：US13515397

    申请日：2010-12-13

    申请人： Dan Sadot ,  Gilad Katz ,  Alik Gorshtein ,  Omri Levi

    发明人： Dan Sadot ,  Gilad Katz ,  Alik Gorshtein ,  Omri Levi

    IPC分类号： H04B10/06 ,  H04B10/61

    CPC分类号： H04B10/613 ,  H04B10/616

    摘要： Method and system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B. A receiving end with IQ paths receives signals and a balanced detector detects signals in each path. The bandwidth of the detected signals is reduced by a factor of N by filtering the output of each path using an AAF with a cutoff frequency optimized to the analog bandwidth 2B/N of each path, where the AAF has deterministic attributes and introducing Known ISI. The signal is sampled at the AAF output by an ADC, at a sampling rate of 2B/N. The samples of each path are post-processed by a digital processor operating at a data rate of 2B/N, where post-processing represents the compensation of the distortion and the input data stream is reconstructed by optimally decoding the output of the processor using a decoder, which compensates the ISI.

    摘要翻译： 用于以给定的模拟带宽B最佳地平衡携带相干光信号的光数据通道的失真的方法和系统。具有IQ路径的接收端接收信号，并且平衡检测器检测每个路径中的信号。 通过使用针对每个路径的模拟带宽2B / N优化的截止频率的AAF对每个路径的输出进行滤波来将检测到的信号的带宽减小N倍，其中AAF具有确定性属性并引入已知的ISI。 信号在ADC的AAF输出采样，采样率为2B / N。 每个路径的采样由以2B / N的数据速率操作的数字处理器进行后处理，其中后处理表示失真的补偿，并且通过使用以下步骤对处理器的输出进行最佳解码来重构输入数据流 解码器，可以补偿ISI。

    LOW COST DIRECT MODULATION AND COHERENT DETECTION OPTICAL OFDM
    9.
    发明申请
    LOW COST DIRECT MODULATION AND COHERENT DETECTION OPTICAL OFDM 有权
    低成本直接调制和相干检测光学OFDM

    公开(公告)号：US20130315607A1

    公开(公告)日：2013-11-28

    申请号：US13884100

    申请日：2011-11-07

    申请人： Dan Sadot ,  Nir Sheffi

    发明人： Dan Sadot ,  Nir Sheffi

    IPC分类号： H04B10/2507

    CPC分类号： H04B10/2507 ,  H04B10/612 ,  H04B10/6161 ,  H04B10/6163 ,  H04B10/63

    摘要： System and method for compensating distortions introduced by an optical channel and by at least one directly modulated transmitting laser that transmits a modulated optical signal that carries data to a receiving end over the optical channel. At the receiving end, the transmitted signal is received by a coherent receiver that processes the received signal by compensating the distortions introduced by the optical channel by applying, on the received signal, an operator being capable of essentially compensating for all fiber distortions in the optical channel; compensating the non-linear phase distortions and/or statistical phase distortions introduced by the directly modulated transmitting laser by applying, on the processed signal obtained after compensating the fiber distortion, a non-linear operator being the extraction of the absolute value of the compensated signal; and extracting the data carried by the processed signal, from the absolute value of the processed signal obtained after compensating the non-linear phase distortions and/or statistical phase distortions, thereby demodulating the processed signal.

    摘要翻译： 用于补偿由光信道引入的失真的系统和方法，以及由至少一个直接调制的发送激光器发送的调制光信号，该调制光信号通过光信道将数据传送到接收端。 在接收端，所发送的信号由相干接收机接收，该接收机通过在接收信号上施加能够基本上补偿光学中的所有光纤失真的方法来补偿由光信道引入的失真来处理接收信号 渠道; 通过在补偿光纤失真后获得的处理信号上应用由直接调制的发射激光器引入的非线性相位失真和/或统计相位失真，提取补偿信号的绝对值的非线性算子 ; 以及从补偿了非线性相位失真和/或统计相位失真之后获得的处理信号的绝对值，提取处理信号所携带的数据，从而解调处理后的信号。

    Method and Apparatus for Increasing the Capacity of A Data Communication Channel
    10.
    发明申请
    Method and Apparatus for Increasing the Capacity of A Data Communication Channel 有权
    用于增加数据通信信道容量的方法和装置

    公开(公告)号：US20100247107A1

    公开(公告)日：2010-09-30

    申请号：US12601980

    申请日：2008-05-26

    申请人： Dan Sadot ,  Gilad Kats

    发明人： Dan Sadot ,  Gilad Kats

    IPC分类号： H04B1/66 ,  H04B10/00

    CPC分类号： H04J3/047 ,  H04B10/541 ,  H04B10/69 ,  H04J7/00

    摘要： Method for efficiently increasing the capacity of an optical channel which can operate in a given data rate B, by generating N modulated data streams with a bit rate of B/N and a bit-time of N/B at the transmission end, to be simultaneously transmitted from a transmission end to a receiving end of the channel. A shift of 1/B*N between the first modulated data stream and each of its N−1 subsequent modulated data streams is generated using time delay or phase shifting and then the first modulated data stream and its shifted subsequent modulated data streams are combined into a composite multilevel signal with up to N levels and the composite multilevel signal is transmitted to a receiving end of the channel. At the receiving end, the composite multilevel signal is sampled N times during each bit-time, in order to obtain a vector with N elements at each time, such that each element has N+1 possible values and corresponds to the order of a sample. Each of the N modulated data streams are reconstructed by vectorial MLSE, preformed for each element by calculating the joint conditional PDF.

    摘要翻译： 通过在传输端产生具有B / N的比特率和N / B的比特率的N个调制数据流来有效地增加可以以给定数据速率B操作的光信道的容量的方法为 同时从发送端发送到信道的接收端。 使用时间延迟或相移产生第一调制数据流与其N-1个后续调制数据流中的每一个之间的1 / B * N的移位，然后将第一调制数据流及其移位的后续调制数据流合并为 具有高达N个电平的复合多电平信号，并且复合多电平信号被发送到信道的接收端。 在接收端，在每个比特时间期间对复合多电平信号进行N次采样，以便每次获得具有N个元素的向量，使得每个元素具有N + 1个可能值并且对应于样本的顺序 。 N个调制数据流中的每一个通过矢量MLSE重建，通过计算联合条件PDF为每个元素预先设定。