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170 条记录 (耗时 0.04 秒)

    Multiplexer and modulation arrangements for multi-carrier optical modems
    81.
    发明授权
    Multiplexer and modulation arrangements for multi-carrier optical modems 有权
    多载波光调制解调器的多路复用器和调制方案

    公开(公告)号：US08861977B2

    公开(公告)日：2014-10-14

    申请号：US13078888

    申请日：2011-04-01

    申请人： John D. McNicol ,  Matthew L. Mitchell ,  David F. Welch

    发明人： John D. McNicol ,  Matthew L. Mitchell ,  David F. Welch

    IPC分类号： H04J14/00 ,  H04J14/06 ,  H04J14/02

    CPC分类号： H04J14/02 ,  H04J14/0256 ,  H04J14/026 ,  H04J14/06

    摘要： A number of carriers are selected according to a modulation format and symbol rate to realize a superchannel having fixed capacity, for example. At a receive node, the superchannel is optically demultiplexed from a plurality of other superchannels. The plurality of carriers are then supplied to a photodetector circuit, which receives additional light at one of the optical signal carrier wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of the carriers is unnecessary.

    摘要翻译： 根据调制格式和符号率来选择多个载波，以实现例如具有固定容量的超频道。 在接收节点处，超级信道从多个其他超级信道被光解复用。 然后将多个载波提供给光电检测器电路，该电路从本地振荡器激光器接收来自光信号载波波长的其中一个附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对ADC的输出进行滤波，使得载波的光解复用是不必要的。

    Degradation adaptation network
    83.
    发明授权
    Degradation adaptation network 有权
    降解适应网络

    公开(公告)号：US08655169B2

    公开(公告)日：2014-02-18

    申请号：US12239896

    申请日：2008-09-29

    申请人： Drew D. Perkins ,  David F. Welch

    发明人： Drew D. Perkins ,  David F. Welch

    IPC分类号： H04B17/00

    CPC分类号： H04J14/0227 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0279 ,  H04L1/0009 ,  H04L1/0057

    摘要： Consistent with the present disclosure, based on system requirements or in response to an increase in optical signal-to-noise level of an optical channel, such as a WDM channel, additional FEC bits are inserted into and replace selected data payload bits in each frame carried by the channel. The replaced data payload bits may then be transmitted in subsequent frames on the same channel. As a result, the transmitted frames have a reduced data payload rate, but a higher coding gain. Alternatively, the replaced data payload bits may be included in frames transmitted on another optical channel. In that case, the frames carried by the two channels typically have the same bit length or number of bits and may thus be compliant with the frame length requirements of G.709, for example. Preferably, the number of coding bits may be changed dynamically to obtain different coding gains.

    摘要翻译： 与本公开一致，基于系统要求或响应于诸如WDM信道的光信道的光信噪比水平的增加，附加的FEC比特被插入并替换每个帧中的选定数据有效载荷比特 由频道携带 然后可以在相同信道上的后续帧中发送替换的数据有效载荷比特。 结果，所发送的帧具有减少的数据有效载荷速率，但是编码增益更高。 或者，替换的数据有效载荷比特可以包括在另一光信道上发送的帧中。 在这种情况下，由两个信道携带的帧通常具有相同的比特长度或比特数，并且因此可以符合例如G.709的帧长度要求。 优选地，可以动态地改变编码比特的数量以获得不同的编码增益。

    Transceiver photonic integrated circuit
    84.
    发明授权
    Transceiver photonic integrated circuit 有权
    收发器光子集成电路

    公开(公告)号：US08548333B2

    公开(公告)日：2013-10-01

    申请号：US12753833

    申请日：2010-04-02

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Fred A. Kish, Jr. ,  David F. Welch ,  Charles H. Joyner

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Fred A. Kish, Jr. ,  David F. Welch ,  Charles H. Joyner

    IPC分类号： H04B10/00

    CPC分类号： H04J14/02 ,  H04B10/40 ,  H04J14/06

    摘要： The present invention provides for a transceiver comprising a transmitter portion and a receiver portion. The transmitter portion includes a laser, the laser providing an optical signal having one of a plurality of wavelengths. The optical signal from the laser is modulated to create a first wavelength-division multiplexed signal at an output of the transceiver. The optical signal from the laser is also used by a demultiplexer to demultiplexer a second wavelength-division multiplexed signal at an input of the transceiver. The use of the optical signal from the laser in both modulation and demodulation of wavelength-division multiplexed signals results in a transceiver having fewer discrete components resulting in a compact design and reduced costs.

    摘要翻译： 本发明提供一种收发器，包括发射机部分和接收机部分。 发射机部分包括激光器，激光器提供具有多个波长中的一个的光信号。 来自激光器的光信号被调制以在收发器的输出处产生第一波分复用信号。 来自激光器的光信号也被解复用器使用，以在收发器的输入端解复用第二波分复用信号。 在波分复用信号的调制和解调中使用来自激光器的光信号导致具有较少分立组件的收发器，导致紧凑的设计并降低了成本。

    WAVELENGTH DIVISION MULTIPLEXED OPTICAL COMMUNICATION SYSTEM HAVING VARIABLE CHANNEL SPACINGS AND DIFFERENT MODULATION FORMATS
    87.
    发明申请
    WAVELENGTH DIVISION MULTIPLEXED OPTICAL COMMUNICATION SYSTEM HAVING VARIABLE CHANNEL SPACINGS AND DIFFERENT MODULATION FORMATS 有权
    具有可变通道间距和不同调制格式的波长段多路复用光通信系统

    公开(公告)号：US20120082459A1

    公开(公告)日：2012-04-05

    申请号：US12897787

    申请日：2010-10-05

    申请人： Kuang-Tsan Wu ,  John D. McNicol ,  David F. Welch ,  Stephen G. Grubb ,  Pierre Mertz

    发明人： Kuang-Tsan Wu ,  John D. McNicol ,  David F. Welch ,  Stephen G. Grubb ,  Pierre Mertz

    IPC分类号： H04J14/02

    CPC分类号： H04J14/02 ,  H04B10/616 ,  H04J14/0224 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/026 ,  H04J14/0279 ,  H04J14/06 ,  H04L1/0007 ,  H04L1/0009 ,  H04L5/0008 ,  H04L25/03834 ,  H04L27/0008 ,  H04L27/2035 ,  H04L27/223 ,  H04L27/34

    摘要： Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.

    摘要翻译： 与本公开一致，数字形式的数据由光通信的发射节点接收，并由数模转换器（DAC）转换为模拟信号以驱动调制器。 调制器又根据接收的数据调制多个波长中的一个波长的光。 然后将调制的光通过光通信路径传输到接收节点。 在接收节点处，调制的光信号以及其它调制的光信号被提供给光电检测器电路，光电检测器电路从本地振荡器激光器接收来自光信号波长之一的附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对来自ADC的输出进行滤波，使得各个信道的光解复用是不必要的。

    OPTICAL COMMUNICATION SYSTEM HAVING LOW LATENCY
    88.
    发明申请
    OPTICAL COMMUNICATION SYSTEM HAVING LOW LATENCY 有权
    具有低延迟的光通信系统

    公开(公告)号：US20120057873A1

    公开(公告)日：2012-03-08

    申请号：US12875672

    申请日：2010-09-03

    申请人： PAUL R. MORKEL ,  David F. Welch

    发明人： PAUL R. MORKEL ,  David F. Welch

    IPC分类号： H04J14/02

    CPC分类号： H04J14/0221 ,  H04B10/2916

    摘要： Consistent with the present disclosure, an optical communication system is provided in which client data is input to a first node and output from a second node, spaced from the first node, with little delay. In one example, the delay is reduced by including higher order Raman amplifiers that provide a substantially uniform gain along the length of a fiber optic link, thereby reducing the number of EDFAs that may otherwise be installed along the optical fiber link or eliminating such EDFAs entirely. In another example, FEC encoding and decoding are not employed, thereby reducing the delay even further.

    摘要翻译： 与本公开一致，提供了一种光通信系统，其中客户端数据被输入到第一节点并且从与第一节点间隔开的第二节点输出几乎没有延迟。 在一个示例中，通过包括沿着光纤链路的长度提供基本上均匀的增益的较高阶拉曼放大器来减小延迟，由此减少否则可以沿着光纤链路安装的EDFA的数量或完全消除这样的EDFA 。 在另一示例中，不使用FEC编码和解码，从而进一步减少延迟。