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    Coherent optical receiver
    45.
    发明授权
    Coherent optical receiver 有权
    相干光接收机

    公开(公告)号：US08538277B2

    公开(公告)日：2013-09-17

    申请号：US12572179

    申请日：2009-10-01

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    IPC分类号： H04B10/06

    CPC分类号： G02B6/12004 ,  G02B6/12009 ,  G02B6/264 ,  G02B2006/12126 ,  H04J14/02 ,  H04J14/06

    摘要： A coherent optical receiver circuit is disclosed in which various components of the optical receiver may be provided or integrated, in one example, on a common substrate. Further integration is achieved by incorporating various optical demultiplexer designs that are relatively compact and conserve space on the surface of the substrate. The optical receiver circuit may be used to demultiplex quadrature phase shift keying (QPSK) optical signals.

    摘要翻译： 公开了一种相干光接收器电路，其中在一个示例中，可以在公共基板上提供或集成光接收器的各种部件。 通过结合相对紧凑的各种光解复用器设计并节省衬底表面上的空间来实现进一步的集成。 光接收机电路可用于解复用正交相移键控（QPSK）光信号。

    Compact optical multiplexer and demultiplexer
    46.
    发明授权
    Compact optical multiplexer and demultiplexer 有权
    紧凑型光复用器和解复用器

    公开(公告)号：US08111996B2

    公开(公告)日：2012-02-07

    申请号：US12391027

    申请日：2009-02-23

    申请人： Masaki Kato ,  Charles H. Joyner ,  Radhakrishnan L. Nagarajan ,  Peter W. Evans

    发明人： Masaki Kato ,  Charles H. Joyner ,  Radhakrishnan L. Nagarajan ,  Peter W. Evans

    IPC分类号： H04B10/00

    CPC分类号： G02B6/12016 ,  G02B6/12019

    摘要： Consistent with the present disclosure, an arrayed waveguide grating (AWG) is provided that includes first inputs and second inputs. Each of the first inputs receives a corresponding one of a plurality of first optical signals, each of which has a corresponding one of a plurality of wavelengths. Second inputs are also provided, such that each second input is preferably provided between two adjacent first inputs. Each of the second inputs receives a corresponding one of a plurality of second optical signals, and each of the second plurality of optical signals has a corresponding one of those wavelengths. Each of the first plurality of optical signals, however, has a first polarization and each of the second plurality of optical signals has a second polarization different than the first polarization. Since the first optical signals are supplied through AWG inputs that are offset from the inputs that receives second optical signals, the first optical signals are supplied at a first AWG output that is spaced from a second AWG output that supplies the second optical signals. The second optical signals are supplied through the second output even though the second optical signals have the same (or substantially the same) wavelengths as the first optical signals. Accordingly, a single AWG may be provided to multiplex both first and second optical signals, thereby simplifying PIC design.

    摘要翻译： 根据本公开，提供了包括第一输入和第二输入的阵列波导光栅（AWG）。 每个第一输入接收多个第一光信号中的相应的一个，每个第一光信号具有多个波长的对应的一个。 还提供第二输入，使得每个第二输入优选地设置在两个相邻的第一输入之间。 每个第二输入接收多个第二光信号中的相应一个，并且第二多个光信号中的每一个具有这些波长中的相应一个。 然而，第一多个光信号中的每一个具有第一偏振，并且第二多个光信号中的每一个具有不同于第一偏振的第二偏振。 由于通过从接收第二光信号的输入偏移的AWG输入提供第一光信号，所以第一光信号在与提供第二光信号的第二AWG输出间隔开的第一AWG输出端提供。 即使第二光信号具有与第一光信号相同（或基本相同）的波长，第二光信号也通过第二输出提供。 因此，可以提供单个AWG来复用第一和第二光信号，从而简化PIC设计。

    Photonic integrated circuit with improved signal quality and electrostatic discharge threshold
    47.
    发明授权
    Photonic integrated circuit with improved signal quality and electrostatic discharge threshold 有权
    光电集成电路具有改善的信号质量和静电放电阈值

    公开(公告)号：US08009940B2

    公开(公告)日：2011-08-30

    申请号：US12413825

    申请日：2009-03-30

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    IPC分类号： G02B6/12

    CPC分类号： H04J14/02 ,  H04B10/501

    摘要： Embodiments of the present invention provide for enhanced monitoring of optical signal characteristics of an optical signal propagating in a signal channel of a photonic integrated circuit. The optical signal characteristics can be obtained with minimal signal loss in the optical signal path and reduced RF crosstalk, while the electrostatic discharge threshold for the photonic integrated circuit is increased, due to the inclusion of a second electro-optic element electrically coupled to a first electro-optic element as part of the signal channel.

    摘要翻译： 本发明的实施例提供了对在光子集成电路的信号通道中传播的光信号的光信号特性进行增强的监视。 光信号特性可以在光信号路径中以最小的信号损失获得，并减少RF串扰，同时由于包括电耦合到第一电子装置的第二电光元件，增加了光子集成电路的静电放电阈值 电光元件作为信号通道的一部分。

    TRANSMITTER PHOTONIC INTEGRATED CIRCUIT
    48.
    发明申请
    TRANSMITTER PHOTONIC INTEGRATED CIRCUIT 有权
    发射机光电集成电路

    公开(公告)号：US20110150471A1

    公开(公告)日：2011-06-23

    申请号：US12646942

    申请日：2009-12-23

    申请人： Charles H. Joyner ,  Radhakrishnan L. Nagarajan ,  Peter W. Evans

    发明人： Charles H. Joyner ,  Radhakrishnan L. Nagarajan ,  Peter W. Evans

    IPC分类号： H04J14/00

    CPC分类号： H04B10/506 ,  H04B10/564

    摘要： The present invention provides a system, apparatus and method to provide for amplification at various points along one or more optical paths of a photonic integrated circuit. According to various embodiments of the invention, the photonic integrated circuit includes a plurality of optical devices having associated characteristics which may have lead to optical signal degradation. One or more optical amplifiers provided along one or more optical paths of the photonic integrated circuit compensate for such signal degradation, resulting in a highly configurable photonic integrated circuit. The various optical devices of the photonic integrated circuit may be provided on a single substrate.

    摘要翻译： 本发明提供一种用于在沿着光子集成电路的一个或多个光路的各个点处进行放大的系统，装置和方法。 根据本发明的各种实施例，光子集成电路包括具有可能导致光信号劣化的相关特性的多个光学器件。 沿着光子集成电路的一个或多个光路提供的一个或多个光放大器补偿这种信号劣化，导致高度可配置的光子集成电路。 光子集成电路的各种光学器件可以设置在单个衬底上。

    TRANSIMPEDANCE AMPLIFIER HAVING A SHARED INPUT
    49.
    发明申请
    TRANSIMPEDANCE AMPLIFIER HAVING A SHARED INPUT 有权
    具有共享输入的转换放大器

    公开(公告)号：US20110001204A1

    公开(公告)日：2011-01-06

    申请号：US12496514

    申请日：2009-07-01

    申请人： Radhakrishnan L. Nagarajan ,  Huan-Shang Tsal

    发明人： Radhakrishnan L. Nagarajan ,  Huan-Shang Tsal

    IPC分类号： H01L31/103 ,  H03F99/00

    CPC分类号： H03F1/083 ,  H01L31/02019 ,  H01L31/103 ,  H01L31/105 ,  H03F3/087

    摘要： Consistent the present disclosure, a receive circuit is provided that includes a balanced detector portion and a transimpedance amplifier (TIA). The anode of one photodiode is connected to the cathode of the other by a bonding pad, which supplies the sum of the currents generated in each photodiode to an input of the TIA. Thus, the TIA may, for example, have a single input, as opposed to multiple inputs, thereby reducing the number of connections so that the photodiodes and the TIA may be integrated onto a smaller die. In addition, since there are few connections, fewer TIAs are required and differential stages are unnecessary. Power consumption is thus reduced, and, since the photodiode current is fed through one input to the TIA, fewer feedback resistors are required, thereby reducing thermal noise. In addition, since the anode of one photodiode is connected to the cathode of the other, the dark current generated in each flows in opposite directions, and is therefore effectively cancelled out. Since one input is provided, impedance matching with other inputs is unnecessary, nor is additional DC biasing circuitry needed. As described in greater detail below, an example of the present disclosure includes a bonding pad, which connects the two photodiodes and provides the input current to the TIA.

    摘要翻译： 与本公开一致，提供了包括平衡检测器部分和跨阻抗放大器（TIA）的接收电路。 一个光电二极管的阳极通过焊盘连接到另一个的阴极，焊盘将每个光电二极管中产生的电流之和提供给TIA的输入端。 因此，TIA可以例如具有与多个输入相反的单个输入，从而减少连接的数量，使得光电二极管和TIA可以集成到较小的管芯上。 另外，由于几乎没有连接，需要较少的TIA，而不需要差分级。 因此降低功耗，并且由于光电二极管电流通过一个输入馈送到TIA，所以需要更少的反馈电阻，从而降低热噪声。 此外，由于一个光电二极管的阳极与另一个光电二极管的阴极连接，所以每个光电二极管中产生的暗电流沿相反的方向流动，因此被有效地抵消。 由于提供了一个输入，因此与其他输入的阻抗匹配是不必要的，也不需要额外的DC偏置电路。 如下面更详细描述的，本公开的示例包括接合焊盘，其连接两个光电二极管并将输入电流提供给TIA。

    PHOTONIC INTEGRATED CIRCUIT WITH IMPROVED SIGNAL QUALITY AND ELECTROSTATIC DISCHARGE THRESHOLD
    50.
    发明申请
    PHOTONIC INTEGRATED CIRCUIT WITH IMPROVED SIGNAL QUALITY AND ELECTROSTATIC DISCHARGE THRESHOLD 有权
    具有改善信号质量和静电放电阈值的光电集成电路

    公开(公告)号：US20100247028A1

    公开(公告)日：2010-09-30

    申请号：US12413825

    申请日：2009-03-30

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    IPC分类号： G02B6/12

    CPC分类号： H04J14/02 ,  H04B10/501

    摘要： Embodiments of the present invention provide for enhanced monitoring of optical signal characteristics of an optical signal propagating in a signal channel of a photonic integrated circuit. The optical signal characteristics can be obtained with minimal signal loss in the optical signal path and reduced RF crosstalk, while the electrostatic discharge threshold for the photonic integrated circuit is increased, due to the inclusion of a second electro-optic element electrically coupled to a first electro-optic element as part of the signal channel.

    摘要翻译： 本发明的实施例提供了对在光子集成电路的信号通道中传播的光信号的光信号特性进行增强的监视。 光信号特性可以在光信号路径中以最小的信号损失获得，并减少RF串扰，同时由于包括电耦合到第一电子装置的第二电光元件，增加了光子集成电路的静电放电阈值 电光元件作为信号通道的一部分。