公开(公告)号：US5943161A

公开(公告)日：1999-08-24

申请号：US944299

申请日：1997-10-06

申请人： Keisuke Shinozaki ,  Chang Qing Xu ,  Hironori Sasaki

发明人： Keisuke Shinozaki ,  Chang Qing Xu ,  Hironori Sasaki

IPC分类号： G02F1/37 ,  G02F1/35 ,  H04B10/2507 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  G02F1/39

CPC分类号： G02F1/3534

摘要： A wavelength conversion device employs an axicon lens to form Bessel beams of signal light and pump light, which are directed into an anisotropic nonlinear optical crystal. The signal light and pump light are both polarized parallel to the uniquely determined Z-axis of the anisotropic nonlinear optical crystal, the Z-axis being oriented perpendicular to the beam axis. The axicon lens is configured to refract the signal light and pump light at angles such that a phase matching condition is satisfied in the anisotropic nonlinear optical crystal, and converted light, also polarized parallel to the Z-axis and having a new wavelength, is generated.

摘要翻译： 波长转换装置采用旋转透镜形成信号光和泵浦光的贝塞尔束，其被引导到各向异性非线性光学晶体中。 信号光和泵浦光都与各向异性非线性光学晶体的独特确定的Z轴平行，Z轴垂直于光束轴定向。 旋转透镜被配置为折射信号光并以各向异性非线性光学晶体满足相位匹配条件的角度泵浦光，并且生成平行于Z轴并具有新波长的变换光 。

公开(公告)号：US07376881B2

公开(公告)日：2008-05-20

申请号：US11132862

申请日：2005-05-19

申请人： Chang Qing Xu ,  Masayuki Tomisawa

发明人： Chang Qing Xu ,  Masayuki Tomisawa

IPC分类号： H04L1/18 ,  H03M13/03

CPC分类号： H03M13/3905 ,  H03M13/23 ,  H03M13/2957 ,  H03M13/41 ,  H03M13/6516

摘要： An encoder system for encoding a signal according to any number of FEC and/or channel codes comprises a shift register, an array of MOD/XOR stages, and a generator matrix stage for controlling the connections between the shift register and the MOD/XOR stages and altering these connections according to a coding format selected by an encoder selection stage. There is also disclosed a decoder system for decoding a signal encoded according to a number of FEC and/or channel codes comprising a decoding stage, and a generator matrix stage for configuring the decoding stage to a decoding code format to be applied an incoming encoded signal. A decoder selection stage is coupled to the generator matrix stage and selects the decoding code format to be used in the decoding process. The decoder selection stage instructs the generator matrix stage to configure the decoding stage according to the selected decoding code format. There is also disclosed a method for encoding and decoding.

摘要翻译： 用于根据任何数量的FEC和/或信道码编码信号的编码器系统包括移位寄存器，MOD / XOR级的阵列和用于控制移位寄存器和MOD / XOR级之间的连接的发生器矩阵级 以及根据由编码器选择级选择的编码格式来改变这些连接。 还公开了一种解码器系统，用于对根据包含解码级的FEC和/或信道码的数量编码的信号进行解码，以及用于将解码级配置为应用输入编码信号的解码级的发生器矩阵级 。 解码器选择级耦合到发生器矩阵级，并选择要在解码过程中使用的解码码格式。 解码器选择阶段指示发生器矩阵级根据选择的解码码格式配置解码级。 还公开了一种编码和解码方法。

公开(公告)号：US07203894B2

公开(公告)日：2007-04-10

申请号：US10847285

申请日：2004-05-18

申请人： Ju Yan Pan ,  Chang Qing Xu ,  Masayuki Tomisawa

发明人： Ju Yan Pan ,  Chang Qing Xu ,  Masayuki Tomisawa

IPC分类号： H03M13/41

CPC分类号： H04L1/0054 ,  H03M13/01

摘要： A method of estimating the reliability of decoded message bits in a digital communications system is proposed. Message and tail bits are coded and transmitted across a communications channel. The coded message and tail bits are then decoded and it is determined that the decoded message bits have no error when the decoded tail bits have at least one error.

摘要翻译： 提出了一种在数字通信系统中估计解码消息比特的可靠性的方法。 消息和尾比特被编码并通过通信信道传输。 然后对编码消息和尾比特进行解码，并且当解码的尾比特具有至少一个错误时，确定解码的消息比特没有错误。

公开(公告)号：US20090294276A1

公开(公告)日：2009-12-03

申请号：US12442523

申请日：2007-09-20

申请人： Chang Qing Xu ,  Jen-Shih Chang ,  Jonathan Markle

发明人： Chang Qing Xu ,  Jen-Shih Chang ,  Jonathan Markle

IPC分类号： H05H1/00 ,  B01J19/08

CPC分类号： G02F1/3558 ,  C30B29/30 ,  C30B33/04

摘要： A crystal poling apparatus has as ingle-domain ferroelectric substrate (e.g. MgO doped LiNbO3 substrate), a sample holder, a high voltage source, a corona torch, a gas source, a chamber, and at least one vacuum pump. An electrode with a certain structure (e.g. a periodical pattern) is formed on the first surface of the substrate, and the substrate is set with the electrode facing down on top of the sample holder. The electrode is grounded so that high electric field is formed in the area with electrode due to the formation of charges generated by the corona torch on the second surface of the substrate. The charge distribution on the second surface of the substrate is controlled by the high voltage source and the gas source. To achieve the optimized crystal poling, the temperature of the substrate is set by the temperature controller, and the electrode on the first surface of the substrate is isolated by the vacuum pump.

摘要翻译： 晶体极化装置具有单域铁电衬底（例如MgO掺杂的LiNbO 3衬底），样品保持器，高压源，电晕炬，气体源，腔室和至少一个真空泵。 在基板的第一表面上形成具有一定结构（例如周期性图案）的电极，并且将电极设置为位于样品保持器顶部的电极。 电极接地，由于在基板的第二表面上形成由电晕炬产生的电荷，所以在具有电极的区域中形成高电场。 基板的第二表面上的电荷分布由高电压源和气体源控制。 为了实现优化的晶体极化，通过温度控制器设置基板的温度，并且通过真空泵将衬底的第一表面上的电极隔离。

公开(公告)号：US07099405B2

公开(公告)日：2006-08-29

申请号：US10193146

申请日：2002-07-12

申请人： Chang Qing Xu ,  Ju Yan Pan ,  Hiroshi Katsuragawa

发明人： Chang Qing Xu ,  Ju Yan Pan ,  Hiroshi Katsuragawa

IPC分类号： H03K9/00

CPC分类号： H04L1/1816 ,  H04L1/0068 ,  H04L1/08 ,  H04L1/1819 ,  H04L1/1845

摘要： A receiver for a HARQ communication system includes a buffer for storing a signal derived from a message. The signal is transmitted to the receiver at a first coding rate. The receiver also includes a decoder which accepts signals having a second coding rate, and a rate dematcher which converts signals from the first coding rate to the second coding rate. The rate dematcher is arranged to process either a combination of the received signals (in the case that the received signals are noisy versions of identical signals transmitted within the communications network) or simply the set of received signals. In either case, the dematcher forwards the results to the decoder. Provided that the second coding rate is lower than the first coding rate, the amount of memory required by the buffer is reduced by locating the buffer before the rate dematching unit.

摘要翻译： 用于HARQ通信系统的接收机包括用于存储从消息导出的信号的缓冲器。 该信号以第一编码速率被发送到接收机。 接收机还包括接收具有第二编码率的信号的解码器和将信号从第一编码率转换为第二编码率的速率去除器。 速率扫描器被设置为处理接收信号的组合（在接收信号是在通信网络内传输的相同信号的噪声版本的情况下）或简单地接收的信号集合。 在任一种情况下，解映射器将结果转发到解码器。 如果第二编码率低于第一编码率，则通过在缓存器之前定位缓存器来减少缓冲器所需的存储器量。

公开(公告)号：US07210089B2

公开(公告)日：2007-04-24

申请号：US10193144

申请日：2002-07-12

申请人： Chang Qing Xu ,  Ju Yan Pan ,  Hiroshi Katsuragawa

发明人： Chang Qing Xu ,  Ju Yan Pan ,  Hiroshi Katsuragawa

IPC分类号： H03M13/00 ,  H04L1/18

CPC分类号： H04L1/005 ,  H03M13/27 ,  H03M13/2957 ,  H03M13/35 ,  H03M13/6306 ,  H03M13/6362 ,  H04L1/0069 ,  H04L1/1819

摘要： A communications system employs a HARQ method and, for at least some transmission formats, incremental redundancy (IR) signals. For such formats, the multiple IR signals are derived from a single turbo encoded signal by forming multiple permutations of the encoded signal. The permutations are then converted to the coding rate of the selected transmission format. It is demonstrated by simulation that the present proposal achieves a better performance than the known HARQ techniques, while its implementation is simpler. For certain transmission formats, the transmitted signal in response to a retransmission request is identical to the first transmitted signal.

摘要翻译： 通信系统采用HARQ方法，并且对于至少一些传输格式，采用增量冗余（IR）信号。 对于这种格式，多个IR信号通过形成编码信号的多个排列从单个turbo编码信号导出。 然后将排列转换为所选传输格式的编码速率。 通过仿真证明，本发明的方案比已知的HARQ技术具有更好的性能，而其实现更简单。 对于某些传输格式，响应于重发请求的发射信号与第一个传输信号相同。

公开(公告)号：US07103117B2

公开(公告)日：2006-09-05

申请号：US10195500

申请日：2002-07-16

申请人： Chang Qing Xu ,  Ju Yan Pan ,  Hiroshi Katsuragawa

发明人： Chang Qing Xu ,  Ju Yan Pan ,  Hiroshi Katsuragawa

IPC分类号： H03D1/04

CPC分类号： H04B1/1081

摘要： Multipath interference in a received wireless signal is cancelled by generating an estimated duplicate of the interference and subtracting it from the received signal. The interference duplication is performed in a truncated manner, based on a determination of which multipath signals are present, so as to reduce the complexity and processing requirement of the interference duplication. In particular, the present invention proposed that the truncation is based on a determination of which multipath signals are present, and the properties of those signals. In a first case, the truncation is that only interference between selected pairs of paths are cancelled in MPIC. In a second case, for given pairs of paths cancellation is only performed for a subset of the chips in which the corresponding two paths can cause interference.

公开(公告)号：US5786916A

公开(公告)日：1998-07-28

申请号：US663875

申请日：1996-06-19

申请人： Hideaki Okayama ,  Chang Qing Xu

发明人： Hideaki Okayama ,  Chang Qing Xu

IPC分类号： H04J14/00 ,  H04B10/00 ,  H04B10/27 ,  H04B10/29 ,  H04J14/02 ,  H04Q11/00

CPC分类号： H04Q11/0001 ,  H04J14/02 ,  H04J14/0224

摘要： An optical-wavelength interchanger element includes a branching section for bifurcating a wavelength-multiplexed input light signal having a multiplicity of an even number into first and second light signals. The interchanger element further includes a wavelength converting element for simultaneously converting wavelengths multiplexed in the first light signal so as to output a third light signal. The interchanger element further includes a transmission path for sending the second light signal therethrough without converting wavelengths multiplexed in the second light signal. The interchanger element further includes a joining section for combining the third light signal and the second light signal so as to output a wavelength-multiplexed output light signal. The interchanger elements may be connected in series in plural stages so as to form an optical-wavelength interchanger device.

摘要翻译： 光波长交换器元件包括用于将具有多个偶数的波长多路复用输入光信号分叉为第一和第二光信号的分支部分。 交换器元件还包括波长转换元件，用于同时转换在第一光信号中复用的波长，以便输出第三光信号。 交换器元件还包括用于发送第二光信号而不转换在第二光信号中复用的波长的传输路径。 交换器元件还包括用于组合第三光信号和第二光信号以便输出波长多路复用的输出光信号的接合部分。 交换器元件可以以多个级串联连接，以形成光波长交换器装置。

公开(公告)号：US5734494A

公开(公告)日：1998-03-31

申请号：US683433

申请日：1996-07-18

申请人： Chang Qing Xu ,  Hideaki Okayama

发明人： Chang Qing Xu ,  Hideaki Okayama

IPC分类号： G02F1/025 ,  G02F1/35 ,  G02F1/39

CPC分类号： G02F1/3534 ,  G02F1/025 ,  G02F2001/3548

摘要： A wavelength conversion device includes a wavelength conversion element. The wavelength conversion element includes a ridge waveguide layer made of nonlinear optical crystals as being a zinc-blend material. The waveguide layer is provided on a GaAs substrate made of the zinc-blend material. The waveguide layer is made of InGaAsP and interposed between clad layers made of InGaP. With this arrangement, signal light and pumping light are incident upon the wavelength conversion element (DFG or SFG element) while the pumping light is fixed in a TE polarization direction. Alternatively, the signal light may be fixed in the TE polarization direction.

摘要翻译： 波长转换装置包括波长转换元件。 波长转换元件包括由非线性光学晶体制成的脊形波导层作为锌共混材料。 波导层设置在由锌 - 共混材料制成的GaAs衬底上。 波导层由InGaAsP制成，并插入由InGaP制成的包层之间。 利用这种布置，当泵浦光以TE偏振方向固定时，信号光和泵浦光入射到波长转换元件（DFG或SFG元件）上。 或者，信号光可以固定在TE偏振方向上。