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    Wavelength division multiplexed passive optical network
    72.
    发明授权
    Wavelength division multiplexed passive optical network 有权
    波分复用无源光网络

    公开(公告)号：US08849120B2

    公开(公告)日：2014-09-30

    申请号：US12987671

    申请日：2011-01-10

    申请人： Radhakrishnan L. Nagarajan ,  Christopher C. Liou ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Christopher C. Liou ,  Masaki Kato

    IPC分类号： H04J14/02

    CPC分类号： H04J14/0282 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0265 ,  H04J14/0298 ,  H04J2014/0253

    摘要： Consistent with the present disclosure, an optical communication system, such as a passive optical network (PON), is provided that includes an optical line terminal (OLT) and a plurality of optical network units (ONUs). The OLT includes a plurality of photonic integrated circuits that have both optical transmitters and receivers provided therein. Accordingly, the OLT may have fewer components and a simpler, more reliable and cost-effective design than a conventional OLT including discrete components. In addition, various ONU configurations are provided that also have a simple design and fewer components. Thus, ONUs consistent with the present disclosure may also have reduced costs.

    摘要翻译： 根据本公开，提供了诸如无源光网络（PON）的光通信系统，其包括光线路终端（OLT）和多个光网络单元（ONU）。 OLT包括多个光子集成电路，其具有设置在其中的光发送器和接收器。 因此，OLT可以具有比包括分立组件的常规OLT更少的组件和更简单，更可靠和更具成本效益的设计。 另外，提供了也具有简单设计和较少组件的各种ONU配置。 因此，与本公开一致的ONU也可以降低成本。

    Wavelength division multiplexed passive optical network
    73.
    发明授权
    Wavelength division multiplexed passive optical network 有权
    波分复用无源光网络

    公开(公告)号：US08582975B2

    公开(公告)日：2013-11-12

    申请号：US12987449

    申请日：2011-01-10

    申请人： Radhakrishnan L. Nagarajan ,  Christopher C. Liou ,  Masaki Kato

    发明人： Radhakrishnan L. Nagarajan ,  Christopher C. Liou ,  Masaki Kato

    IPC分类号： H04B10/00

    CPC分类号： H04J14/0282 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0265 ,  H04J14/0298 ,  H04J2014/0253

    摘要： Consistent with the present disclosure, an optical communication system, such as a passive optical network (PON), is provided that includes an optical line terminal (OLT) and a plurality of optical network units (ONUs). The OLT includes a plurality of photonic integrated circuits that have both optical transmitters and receivers provided therein. Accordingly, the OLT may have fewer components and a simpler, more reliable and cost-effective design than a conventional OLT including discrete components. In addition, various ONU configurations are provided that also have a simple design and fewer components. Thus, ONUs consistent with the present disclosure may also have reduced costs.

    摘要翻译： 根据本公开，提供了诸如无源光网络（PON）的光通信系统，其包括光线路终端（OLT）和多个光网络单元（ONU）。 OLT包括多个光子集成电路，其具有设置在其中的光发送器和接收器。 因此，OLT可以具有比包括分立组件的常规OLT更少的组件和更简单，更可靠和更具成本效益的设计。 另外，提供了也具有简单设计和较少组件的各种ONU配置。 因此，与本公开一致的ONU也可以降低成本。

    Variable optical attentuator (VOA) having an absorber for receiving residual light outputfrom the VOA
    75.
    发明授权
    Variable optical attentuator (VOA) having an absorber for receiving residual light outputfrom the VOA 有权
    具有用于接收从VOA输出的残留光的吸收体的可变光学注意器（VOA）

    公开(公告)号：US08299417B2

    公开(公告)日：2012-10-30

    申请号：US12572203

    申请日：2009-10-01

    申请人： Radhakrishnan L. Nagarajan

    发明人： Radhakrishnan L. Nagarajan

    IPC分类号： G01J1/04

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

    摘要： A variable optical attenuator (VOA), which may include a Mach-Zehnder interferometer, is configured such that a substantial part of an input signal is output on a first waveguide, and a relatively small part of the input signal may be output on a second waveguide due to manufacturing process variations and/or other non-idealities. Such residual or extraneous light may interfere with light in the first waveguide, especially if the VOA is integrated on substrate. Accordingly, consistent with an aspect of the present disclosure, a photodiode may be provided to receive and absorb the residual light, thereby minimizing interference or cross-talk with light in the first waveguide.

    摘要翻译： 可以包括马赫 - 策德尔干涉仪的可变光衰减器（VOA）被配置为使得输入信号的实质部分在第一波导上输出，并且输入信号的相对较小的一部分可以在第二波导 波导由于制造工艺变化和/或其他非理想性而产生。 这种残余或外来光可能会干扰第一波导中的光，特别是如果VOA集成在基板上。 因此，根据本公开的一个方面，可以提供光电二极管来接收和吸收残余光，从而最小化与第一波导中的光的干扰或串扰。

    Polarization beam splitter
    76.
    发明授权
    Polarization beam splitter 有权
    极化分束器

    公开(公告)号：US08260136B2

    公开(公告)日：2012-09-04

    申请号：US12572208

    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： H04J4/00 ,  H04J14/06 ,  H04B10/06

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

    摘要： Consistent with the present disclosure, a polarization multiplexed optical signal having optical signals with both TE and TM polarizations is supplied to an input of a polarization beam splitter (PBS). The PBS includes a first output that supplies TE polarized optical signals and a second output supplies TM polarized optical signals. A first polarizer is coupled to the second output of the PBS to pass the TM polarized optical signals, while rejecting light having other polarizations, such as the TE polarization. A rotator then rotates the light output from the first polarizer, so that such light has a TE polarization. A second polarizer is coupled to the rotator to filter light having a polarization other than the TE polarization. In addition, a third polarizer is coupled to the first output of the PBS in order to filter or block any TM light, for example, that may be output from the PBS with the TE polarized signal. Accordingly, the optical signals in the polarization multiplexed optical signal are effectively filtered, and some are rotated so that each has the same, e.g., TE polarization. Moreover, each optical signal is substantially free from light having extraneous polarizations and may be supplied to an optical hybrid circuit. Data carried by such optical signals may thus be reliably recovered.

    摘要翻译： 根据本公开，具有TE和TM偏振两者的光信号的偏振复用光信号被提供给偏振分束器（PBS）的输入端。 PBS包括提供TE偏振光信号的第一输出，第二输出提供TM偏振光信号。 第一偏振器耦合到PBS的第二输出以通过TM偏振光信号，同时抑制具有其它极化的光，例如TE偏振。 旋转器然后旋转从第一偏振器输出的光，使得这种光具有TE偏振。 第二偏振器耦合到旋转器以对具有除了TE极化之外的极化的光进行滤波。 此外，第三偏振器耦合到PBS的第一输出，以便滤波或阻挡例如可以用TE偏振信号从PBS输出的TM光。 因此，偏振复用光信号中的光信号被有效地滤波，并且有些被旋转，使得每个具有相同的例如TE偏振。 此外，每个光信号基本上没有具有外来极化的光，并且可以被提供给光混合电路。 因此可以可靠地恢复由这种光信号携带的数据。

    High capacity transmitter implemented on a photonic integrated circuit
    77.
    发明授权
    High capacity transmitter implemented on a photonic integrated circuit 有权
    在光子集成电路上实现的高容量发射器

    公开(公告)号：US08238759B2

    公开(公告)日：2012-08-07

    申请号：US12345315

    申请日：2008-12-29

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

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

    IPC分类号： H04B10/04

    CPC分类号： H04B10/532 ,  H01S5/0085 ,  H01S5/0265 ,  H01S5/12 ,  H01S5/4012 ,  H04B10/505 ,  H04B10/5561

    摘要： A high capacity optical transmitter implemented on a photonic integrated circuit chip comprises a single light source which supplies a continuous wave having a particular wavelength to a plurality of modulators to form modulated optical information signals. A phase shifter is coupled to at least one of the modulators and is used to shift the phase of the corresponding modulated optical information signal associated with a particular modulator. A polarization beam combiner receives each of the modulated optical information signals from the modulators and the modulated optical information signal from the phase shifter and combines each of these signals to form a polarization multiplexed differential quadrature phase-shift keying signal. The light source, the plurality of modulators, the phase shifter and the polarization beam combiner are all integrated on the chip.

    摘要翻译： 在光子集成电路芯片上实现的高容量光发射器包括单个光源，其向多个调制器提供具有特定波长的连续波以形成调制的光信息信号。 移相器耦合到至少一个调制器，并且用于移位与特定调制器相关联的相应调制光信息信号的相位。 偏振光束组合器从调制器接收来自调制器的调制光信息信号和来自移相器的调制光信息信号，并组合这些信号中的每一个以形成偏振复用差分正交相移键控信号。 光源，多个调制器，移相器和偏振光束组合器都集成在芯片上。

    Optical integrated circuit
    78.
    发明授权
    Optical integrated circuit 有权
    光集成电路

    公开(公告)号：US08160405B2

    公开(公告)日：2012-04-17

    申请号：US12646340

    申请日：2009-12-23

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Vikrant Lal

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Vikrant Lal

    IPC分类号： G02B6/00 ,  G02B6/10

    CPC分类号： G02B6/126 ,  G02B6/27 ,  G02B6/2706 ,  G02B6/2766

    摘要： Consistent with the present disclosure, a non-adiabatic polarization rotator is provided that can rotate the polarization of an incoming over a relatively short length. Light is supplied to the polarization rotator via a polarizer, which insures that the optical input to the polarization polarization rotator has a desired polarization. Preferably, the polarization rotator has a structure that is readily implemented with semiconductor materials and can be fabricated with known processing techniques. In addition, the polarization rotator and polarizer may include similar materials and/or layers, such that both may be readily integrated on a common substrate, such as an indium phosphide (InP) substrate.

    摘要翻译： 根据本公开，提供了一种非绝热的偏振旋转器，其可以使相对较短长度的进入的偏振旋转。 通过偏振器将光提供给偏振旋转器，这确保了偏振旋转器的光输入具有期望的偏振。 优选地，偏振旋转器具有易于用半导体材料实现的结构，并且可以用已知的处理技术制造。 此外，偏振旋转器和偏振器可以包括相似的材料和/或层，使得两者可以容易地集成在公共衬底上，例如磷化铟（InP）衬底。

    Photonic integrated circuit (PIC) transceivers for an optical line terminal (OLT) and an optical network unit (ONU) in passive optical networks (PONs)
    79.
    发明授权
    Photonic integrated circuit (PIC) transceivers for an optical line terminal (OLT) and an optical network unit (ONU) in passive optical networks (PONs) 有权
    用于光线路终端（OLT）的光子集成电路（PIC）收发器和无源光网络（PON）中的光网络单元（ONU）

    公开(公告)号：US07877016B2

    公开(公告)日：2011-01-25

    申请号：US11253776

    申请日：2005-10-19

    申请人： Radhakrishnan L. Nagarajan

    发明人： Radhakrishnan L. Nagarajan

    IPC分类号： H04B10/00

    CPC分类号： H04J14/02 ,  H04B10/43 ,  H04J14/0282 ,  H04J14/0283

    摘要： A photonic integrated circuit (PIC) for a PON transceiver comprises a single monolithic chip having a modulated transmitter laser diode of a first wavelength, λ1, for generating a first communication signal outgoing from the chip via an input/output port and a receiving photodetector for receiving a second communication signal of a second wavelength, λ2, onto chip incoming from the input/output port and a monitoring photodetector for receiving a portion of the first communication signal to monitor the laser diode output power.

    摘要翻译： 用于PON收发器的光子集成电路（PIC）包括具有第一波长的调制发射器激光二极管λ1的单个单片芯片，用于产生经由输入/输出端口从芯片输出的第一通信信号和用于 接收来自输入/输出端口的芯片上的第二波长λ2的第二通信信号和用于接收第一通信信号的一部分以监测激光二极管输出功率的监视光电检测器。

    Optical receiver integrated on a substrate
    80.
    发明申请
    Optical receiver integrated on a substrate 有权
    集成在基板上的光接收器

    公开(公告)号：US20100322631A1

    公开(公告)日：2010-12-23

    申请号：US12816599

    申请日：2010-06-16

    申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Jeffrey T. Rahn

    发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Jeffrey T. Rahn

    IPC分类号： H04J14/06

    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。