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    Rotator external to photonic integrated circuit
    32.
    发明授权
    Rotator external to photonic integrated circuit 有权
    旋转器外部光子集成电路

    公开(公告)号：US09261635B2

    公开(公告)日：2016-02-16

    申请号：US13537805

    申请日：2012-06-29

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Jeffrey T. Rahn ,  Alan C. Nilsson ,  Kuang-Tsan Wu

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Jeffrey T. Rahn ,  Alan C. Nilsson ,  Kuang-Tsan Wu

    IPC分类号： G02F1/01 ,  G02B5/30 ,  G02B5/32 ,  G01J1/04 ,  H04J14/06 ,  G02B6/12 ,  G02B6/126 ,  G01J1/42 ,  H04J14/02

    CPC分类号： G02B5/30 ,  G01J1/0425 ,  G01J1/0429 ,  G01J1/4228 ,  G02B5/32 ,  G02B6/12007 ,  G02B6/12019 ,  G02B6/126 ,  H04J14/02 ,  H04J14/0279 ,  H04J14/06

    摘要： An optical system may include a polarization beam splitter having an input that receives multiple optical signals, a first output and a second output. The first output may provide components of the multiple optical signals having a first polarization. The second output may provide components of the multiple optical signals having a second polarization. The optical system may include a rotator having an input that receives the components to rotate the first polarization such that each of the components has the second polarization, and an output to supply components as rotated components.The optical system may also include an optical circuit including a substrate. The rotator may be separate from the substrate. The optical circuit may include an optical demultiplexer circuit provided on the substrate to receive the rotated components and the components.

    摘要翻译： 光学系统可以包括具有接收多个光信号，第一输出和第二输出的输入的偏振分束器。 第一输出可以提供具有第一偏振的多个光信号的分量。 第二输出可以提供具有第二偏振的多个光信号的分量。 光学系统可以包括旋转器，其具有接收组件以旋转第一偏振的输入，使得每个组件具有第二偏振，以及用于将组件作为旋转分量供给的输出。 光学系统还可以包括包括衬底的光学电路。 旋转体可以与基底分开。 光电路可以包括设置在基板上以接收旋转的部件和部件的光解复用器电路。

    Shared propagation region for an optical multiplexer or an optical demultiplexer
    33.
    发明授权
    Shared propagation region for an optical multiplexer or an optical demultiplexer 有权
    用于光复用器或光解复用器的共享传播区域

    公开(公告)号：US09036957B2

    公开(公告)日：2015-05-19

    申请号：US13537771

    申请日：2012-06-29

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    IPC分类号： G02B6/12 ,  G02F1/01

    CPC分类号： G02F1/011 ,  G02B6/12014 ,  G02B6/12019 ,  G02B2006/12116 ,  G02B2006/12123

    摘要： An optical system may include an optical multiplexer or demultiplexer circuit having a slab with a propagation region. The propagation region may have a first propagation section and a second propagation section, such that a portion of the first propagation section and a portion of the second propagation section overlap each other to form a shared propagation section. The shared propagation section may include both the portion of the first propagation section and the portion of the second propagation section. The first propagation section and the second propagation section may each have a first end and a second end. The optical system may further include multiple waveguides directly connected to the second end of the first propagation section and directly connected to the second end of the second propagation section.

    摘要翻译： 光学系统可以包括具有传播区域的板的光学多路复用器或解复用器电路。 传播区域可以具有第一传播部分和第二传播部分，使得第一传播部分的一部分和第二传播部分的一部分彼此重叠以形成共享传播部分。 共享传播部分可以包括第一传播部分的部分和第二传播部分的部分。 第一传播部分和第二传播部分可以各自具有第一端和第二端。 光学系统还可以包括直接连接到第一传播部分的第二端并直接连接到第二传播部分的第二端的多个波导。

    Transceiver photonic integrated circuit
    34.
    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。

    WIDE PASSBAND AWG
    35.
    发明申请
    WIDE PASSBAND AWG 有权
    WASS PASSBAND AWG

    公开(公告)号：US20130011098A1

    公开(公告)日：2013-01-10

    申请号：US13177363

    申请日：2011-07-06

    申请人： Masaki Kato ,  Radhakrishnan L. Nagarajan

    发明人： Masaki Kato ,  Radhakrishnan L. Nagarajan

    IPC分类号： G02B6/34

    CPC分类号： G02B6/12011

    摘要： Consistent with the present disclosure, an AWG is provided that has grating waveguide groupings that extend between a first free space region and a second free space region. The difference in length (ΔL) between successive grating waveguides differs for each grouping of grating waveguides, such that, for example, the ΔL associated with a given grating waveguide grouping is not an integer multiple of any of the other grating waveguide groupings. The grating waveguide groupings direct images having relatively small wavelength differences to a given output waveguide, and each grating waveguide grouping has an associated passband, which is similar to that of the conventional AWG. Unlike the conventional AWG, however, multiple grating waveguide groupings are included in the same AWG, such that the spectra associated with the grating waveguide groupings combine to provide a transmission characteristic having a passband that is greater than any individual passband. Accordingly, even if the optical signal wavelengths vary or are offset from the center wavelength of the passband, such wavelengths may still be transmitted with less loss.

    摘要翻译： 根据本公开，提供了AWG，其具有在第一自由空间区域和第二自由空间区域之间延伸的光栅波导分组。 对于每组光栅波导，连续光栅波导之间的长度差（＆Dgr; L）不同，例如，与给定光栅波导组合相关联的＆Dgr; L不是任何其他光栅波导的整数倍 分组。 光栅波导分组将具有相对小的波长差的图像分配给给定的输出波导，并且每个光栅波导组具有相关的通带，其类似于常规的AWG。 然而，与传统AWG不同，多个光栅波导分组被包括在相同的AWG中，使得与光栅波导分组相关联的光谱组合以提供具有大于任何单个通带的通带的传输特性。 因此，即使光信号波长变化或偏离通带的中心波长，这样的波长仍然可以以较少的损耗传输。

    Transimpedance amplifier having a shared input
    37.
    发明授权
    Transimpedance amplifier having a shared input 有权
    具有共享输入的互阻放大器

    公开(公告)号：US08204388B2

    公开(公告)日：2012-06-19

    申请号：US12496514

    申请日：2009-07-01

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

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

    IPC分类号： H04B10/06

    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。

    Reflection suppression in a photonic integrated circuit
    38.
    发明授权
    Reflection suppression in a photonic integrated circuit 有权
    光子集成电路中的反射抑制

    公开(公告)号：US07974504B2

    公开(公告)日：2011-07-05

    申请号：US12058652

    申请日：2008-03-28

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato

    IPC分类号： G02B6/12 ,  G02B6/28 ,  G02B6/34

    CPC分类号： G02B6/12004 ,  G02B6/12007 ,  G02B6/12016 ,  G02B6/12019

    摘要： Embodiments of the present invention provide systems, devices and methods in which optical reflections are reduced in a photonic integrated circuit. These embodiments include reflection suppression elements which operate to dissipate optical energy that would otherwise provide a source for optical reflections which may impact the operation of one or more devices within the photonic integrated circuit. In particular, within photonic integrated circuits incorporating semiconductor optical amplifiers, embodiments of the present invention include reflection suppression elements which operate to dissipate optical energy preventing the semiconductor optical amplifiers from operating in a gain-clamped mode.

    摘要翻译： 本发明的实施例提供了在光子集成电路中减少光学反射的系统，装置和方法。 这些实施例包括反射抑制元件，其操作以耗散光能量，否则光能量可以提供用于光学反射的源，其可影响光子集成电路内的一个或多个器件的操作。 特别地，在包含半导体光放大器的光子集成电路中，本发明的实施例包括反射抑制元件，其用于消散防止半导体光放大器以增益钳位模式操作的光能。

    Coolerless photonic integrated circuits (PICs) for WDM transmission networks and PICs operable with a floating signal channel grid changing with temperature but with fixed channel spacing in the floating grid
    40.
    发明授权
    Coolerless photonic integrated circuits (PICs) for WDM transmission networks and PICs operable with a floating signal channel grid changing with temperature but with fixed channel spacing in the floating grid 有权
    用于WDM传输网络和PIC的无冷却光子集成电路（PIC）可与浮动信号通道网格一起工作，浮动信道网格随着温度而变化，但在浮动网格中具有固定的信道间隔

    公开(公告)号：US07636522B2

    公开(公告)日：2009-12-22

    申请号：US11106875

    申请日：2005-04-14

    申请人： Radhakrishnan L. Nagarajan ,  Fred A. Kish, Jr. ,  David F. Welch ,  Drew D. Perkins ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Fred A. Kish, Jr. ,  David F. Welch ,  Drew D. Perkins ,  Masaki Kato

    IPC分类号： H04J14/02

    CPC分类号： G02B6/12033 ,  B82Y20/00 ,  G02B6/12019 ,  G02B6/2813 ,  G02B6/293 ,  G02B6/29317 ,  G02B6/29338 ,  G02B6/29352 ,  H01S5/005 ,  H01S5/0085 ,  H01S5/02248 ,  H01S5/024 ,  H01S5/0261 ,  H01S5/0265 ,  H01S5/0268 ,  H01S5/0683 ,  H01S5/1032 ,  H01S5/12 ,  H01S5/1221 ,  H01S5/2231 ,  H01S5/34306 ,  H01S5/4031 ,  H01S5/4087 ,  H04B10/506

    摘要： A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room temperature without the need for ambient cooling or hermetic packaging. Since there is large scale integration of N optical transmission signal WDM channels on a TxPIC chip, a new DWDM system approach with novel sensing schemes and adaptive algorithms provides intelligent control of the PIC to optimize its performance and to allow optical transmitter and receiver modules in DWDM systems to operate uncooled. Moreover, the wavelength grid of the on-chip channel laser sources may thermally float within a WDM wavelength band where the individual emission wavelengths of the laser sources are not fixed to wavelength peaks along a standardized wavelength grid but rather may move about with changes in ambient temperature. However, control is maintained such that the channel spectral spacing between channels across multiple signal channels, whether such spacing is periodic or aperiodic, between adjacent laser sources in the thermally floating wavelength grid are maintained in a fixed relationship. Means are then provided at an optical receiver to discover and lock onto floating wavelength grid of transmitted WDM signals and thereafter demultiplex the transmitted WDM signals for OE conversion.

    摘要翻译： 诸如半导体电吸收调制器/激光器（EML）或无冷器光发射机光子集成电路（TxPIC）的无冷却光子集成电路（PIC）可以在高于室温的温度范围内工作，而不需要 需要环境冷却或密封包装。 由于在TxPIC芯片上存在N个光传输信号WDM信道的大规模集成，新的具有新型感测方案和自适应算法的DWDM系统方法提供了PIC的智能控制，以优化其性能并允许光发射机和接收机模块在DWDM 系统运行未冷却。 此外，片上通道激光源的波长网格可以在WDM波长带内热漂浮，其中激光源的各个发射波长不沿着标准波长网格固定到波长峰值，而是可以随着环境的变化而移动 温度。 然而，保持控制，使得在热浮动波长网格中的相邻激光源之间跨多个信号通道的信道之间的信道频谱间隔（无论这样的间隔是周期性的还是非周期性的）保持固定的关系。 然后在光接收器处提供装置以发现并锁定发送的WDM信号的浮动波长网格，然后对发送的WDM信号进行解复用以进行OE转换。