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    Optical communication system having low latency
    1.
    发明授权
    Optical communication system having low latency 有权

    公开(公告)号：US09634788B2

    公开(公告)日：2017-04-25

    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： H04B10/00 ,  H04J14/02 ,  H04B10/291

    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.

    OPTICAL COMMUNICATION SYSTEM HAVING LOW LATENCY
    2.
    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。

    Wavelength division multiplexed optical communication system architectures
    4.
    发明授权
    Wavelength division multiplexed optical communication system architectures 有权
    波分复用光通信系统架构

    公开(公告)号：US08655190B2

    公开(公告)日：2014-02-18

    申请号：US12897788

    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： H04B10/06

    CPC分类号： H04J14/0279 ,  H04B10/5053 ,  H04B10/616 ,  H04J14/0208 ,  H04J14/0212 ,  H04J14/0224 ,  H04J14/0256 ,  H04J14/0271 ,  H04J14/0272 ,  H04J14/06

    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 TRANSMITTER SUPPLYING OPTICAL SIGNALS HAVING MULTIPLE MODULATION FORMATS
    5.
    发明申请
    OPTICAL TRANSMITTER SUPPLYING OPTICAL SIGNALS HAVING MULTIPLE MODULATION FORMATS 审中-公开
    提供多个调制格式的光信号的光传输器

    公开(公告)号：US20110229149A1

    公开(公告)日：2011-09-22

    申请号：US12728951

    申请日：2010-03-22

    申请人： STEPHEN G. GRUBB ,  David F. Welch

    发明人： STEPHEN G. GRUBB ,  David F. Welch

    IPC分类号： H04B10/04

    CPC分类号： H04B10/506 ,  H04B10/5161

    摘要： Consistent with the present disclosure, a compact transmitter is provided that can generate optical signals having different modulation formats depending on optical link requirements. Preferably, the transmitter includes a photonic integrated circuit having multiple lasers and modulators. A control circuit adjusts the drive signals supplied to the modulators such that optical signals having a desired modulation format may be output from the modulators. Thus, for example, the transmitter may be used to output optical signals having a modulation format suitable for long haul or submarine links, as well as for links having a shorter distance. Moreover, the same photonic integrated circuit may supply optical signals with different modulation formats, such that, for example, those optical signals that are dropped along a link, and thus travel a shorter distance, may have a first modulation format, while other optical signals that travel the entire length of the link may have a second modulation format that is more suited for longer distances.

    摘要翻译： 根据本公开，提供了紧凑型发射机，其可以根据光链路要求生成具有不同调制格式的光信号。 优选地，发射机包括具有多个激光器和调制器的光子集成电路。 控制电路调节提供给调制器的驱动信号，使得可以从调制器输出具有所需调制格式的光信号。 因此，例如，发射机可以用于输出具有适合于长距离或潜艇链路的调制格式的光信号，以及具有较短距离的链路。 此外，相同的光子集成电路可以提供具有不同调制格式的光信号，使得例如沿着链路落下并因此行进更短距离的那些光信号可以具有第一调制格式，而其它光信号 传播链路的整个长度的信号可以具有更适合于较长距离的第二调制格式。

    DEGRADATION ADAPTATION NETWORK
    7.
    发明申请
    DEGRADATION ADAPTATION NETWORK 有权
    降解适应网络

    公开(公告)号：US20100080562A1

    公开(公告)日：2010-04-01

    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： H04J14/08

    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： 根据本公开内容，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的数据有效载荷比特 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。