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    Method and system for cassette based wavelength division multiplexing
    12.
    发明授权
    Method and system for cassette based wavelength division multiplexing 有权

    公开(公告)号：US10348437B2

    公开(公告)日：2019-07-09

    申请号：US15585838

    申请日：2017-05-03

    Applicant: Luxtera, Inc.

    Inventor： Brian Welch

    IPC: H04J14/02 ,  H04B10/25 ,  H04B10/40 ,  H04B10/50 ,  H04B10/516 ,  G02B6/42 ,  G02B6/12 ,  G02B6/30 ,  G02B6/34

    Abstract: A method and system is provided for cassette based wavelength division multiplexing and may include an optical system with an aggregating cassette. The optical system may include optical transceivers, with each generating optical signals at a different wavelength. The aggregating cassette may include one or more multiplexers coupled to each of the optical transceivers via optical fibers. The optical transceivers may generate modulated optical signals at one of the different wavelengths. The optical fibers may communicate one of the modulated optical signals from each of the optical transceivers to the one or more multiplexers. The modulated optical signals may be multiplexed to one or more output optical fibers. The multiplexed signals may be communicated to one or more receiving demultiplexers using the one or more output optical fibers. The one or more demultiplexers may demultiplex said multiplexed signals into separate wavelength signals.

    Method and system for a feedback transimpedance amplifier with sub-40khz low-frequency cutoff
    13.
    发明授权
    Method and system for a feedback transimpedance amplifier with sub-40khz low-frequency cutoff 有权

    公开(公告)号：US10348257B2

    公开(公告)日：2019-07-09

    申请号：US15660571

    申请日：2017-07-26

    Applicant: Luxtera, Inc.

    Inventor： Brian Welch

    IPC: H03F3/08 ,  H03F3/45 ,  H03F1/34 ,  G01J1/44

    Abstract: A system for a differential trans-impedance amplifier circuit comprising: an amplifier having a pair of input nodes and configured to generate an amplified replica of a differential voltage on said pair of input nodes; a photodiode; a pair of DC-blocking capacitors coupling said photodiode to said pair of input nodes; at least one resistance coupled between said pair of input nodes of said amplifier; and a bias network comprising two identical photodiode biasing resistances each photodiode biasing resistance coupled in series between said photodiode and a respective DC voltage. A feedback loop for the amplifier may include source followers that are operable to level shift voltages prior to coupling capacitors that couple said photodiode to said amplifier to ensure stable bias conditions for said amplifier. The source followers may include CMOS transistors. The amplifier may be integrated in a complementary metal-oxide semiconductor (CMOS) chip, which may include a CMOS photonics chip.

    Method and system for split voltage domain receiver circuits
    14.
    发明授权
    Method and system for split voltage domain receiver circuits 有权

    公开(公告)号：US10263816B2

    公开(公告)日：2019-04-16

    申请号：US16105567

    申请日：2018-08-20

    Applicant: Luxtera, Inc.

    Inventor： Brian Welch

    IPC: H04B10/00 ,  H04L25/06 ,  H04B10/60 ,  H04L25/02 ,  H04B10/50 ,  H04B10/516 ,  H04B10/564 ,  H04B10/69 ,  H04J14/00 ,  G02B6/42

    Abstract: Methods and systems for split voltage domain receiver circuits are disclosed and may include amplifying complementary received signals in a plurality of partial voltage domains. The signals may be combined into a single differential signal in a single voltage domain. Each of the partial voltage domains may be offset by a DC voltage from the other partial voltage domains. The sum of the partial domains may be equal to a supply voltage of the integrated circuit. The complementary signals may be received from a photodiode. The amplified received signals may be amplified via stacked common source amplifiers, common emitter amplifiers, or stacked inverters. The amplified received signals may be DC coupled prior to combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked, and may be controlled via feedback loops. The photodetector may be integrated in the integrated circuit.

    Method And System for A Distributed Optoelectronic Receiver
    16.
    发明申请
    Method And System for A Distributed Optoelectronic Receiver 审中-公开

    公开(公告)号：US20180262275A1

    公开(公告)日：2018-09-13

    申请号：US15977835

    申请日：2018-05-11

    Applicant: Luxtera, Inc.

    Inventor： Brian Welch ,  Gianlorenzo Masini

    IPC: H04B10/69 ,  H03F3/08 ,  H03G3/30 ,  H04B10/80 ,  H03H21/00

    CPC classification number: H04B10/693 ,  H03F3/085 ,  H03G3/3084 ,  H03H21/0012 ,  H04B10/80

    Abstract: Methods and systems for a distributed optoelectronic receiver are disclosed and may include an optoelectronic receiver having a grating coupler, a splitter, a plurality of photodiodes, and a plurality of transimpedance amplifiers (TIAs). The receiver receives a modulated optical signal utilizing the grating coupler, splits the received signal into a plurality of optical signals, generates a plurality of electrical signals from the plurality of optical signals utilizing the plurality of photodiodes, communicates the plurality of electrical signals to the plurality of TIAs, amplifies the plurality of electrical signals utilizing the plurality of TIAs, and generates an output electrical signal from coupled outputs of the plurality of TIAs. Each TIA may be configured to amplify signals in a different frequency range. One of the plurality of electrical signals may be DC coupled to a low frequency TIA of the plurality of TIAs.

    Method and System for Cassette Based Wavelength Division Multiplexing
    18.
    发明申请
    Method and System for Cassette Based Wavelength Division Multiplexing 审中-公开

    公开(公告)号：US20170141869A1

    公开(公告)日：2017-05-18

    申请号：US15356514

    申请日：2016-11-18

    Applicant: Luxtera, Inc.

    Inventor： Brian Welch

    IPC: H04J14/02 ,  G02B6/12 ,  G02B6/44

    CPC classification number: H04J14/02 ,  G02B6/12007 ,  G02B6/30 ,  G02B6/34 ,  G02B6/4215 ,  H04B10/801

    Abstract: A method and system is provided for cassette based wavelength division multiplexing. Higher throughput per laser “colored” transceivers are disclosed that can be multiplexed at the patch panel where an implementation may comprise a dense WDM grid that enables parts to meet “PSM4” specs natively regardless of color. The server to Tier 1 switch may utilize short reach PSM4 interconnects, at distances typically less than 500 meters. The Tier 1 to Tier 2 switch may utilize higher density per fiber. The outbound facing interface of Tier 1 switch has colored PSM4 interfaces and may have tight wavelength separation to enable PSM4 interoperability. The shuffling/multiplexing of colored modules may be configured outside the switch, where the aggregating cassette may be part of the patch panel and comprise a top of rack media converter.

    Method and system for split voltage domain receiver circuits
    20.
    发明授权
    Method and system for split voltage domain receiver circuits 有权
    分离电压域接收电路的方法和系统

    公开(公告)号：US09264143B2

    公开(公告)日：2016-02-16

    申请号：US14281241

    申请日：2014-05-19

    Applicant: Luxtera, Inc.

    Inventor： Brian Welch

    IPC: H04B10/00 ,  H04B10/60

    CPC classification number: H04L25/061 ,  G02B6/4201 ,  G02B6/4242 ,  H04B10/501 ,  H04B10/516 ,  H04B10/564 ,  H04B10/60 ,  H04B10/693 ,  H04L25/0272

    Abstract: Methods and systems for split voltage domain receiver circuits are disclosed and may comprise amplifying complementary received signals in a plurality of partial voltage domains, and combining the amplified received signals, utilizing a stacked cascode amplifier for each domain, into a single differential signal in a single voltage domain. The stacked cascode amplifiers may comprise a feedback loop having a comparator which controls a current source in each domain. The complementary signals may be received from a photodiode, which may be integrated in the integrated circuit. The amplified received signals may be combined via stacked common source or common emitter amplifiers. The received signals via may be amplified by stacked inverters. The amplified received signals may be AC or DC coupled prior to the combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked and may be controlled by feedback loops.

    Abstract translation: 公开了用于分压电压域接收器电路的方法和系统，并且可以包括放大多个部分电压域中的互补接收信号，并且将放大的接收信号组合为每个域的堆叠级联放大器，形成单个差分信号 电压域。 堆叠的共源共栅放大器可以包括具有控制每个域中的电流源的比较器的反馈回路。 可以从可以集成在集成电路中的光电二极管接收互补信号。 放大的接收信号可以通过堆叠的公共源或公共发射极放大器组合。 所接收的信号通过堆叠的反相器可以被放大。 放大的接收信号可以在组合之前被AC或DC耦合。 互补的接收信号可以通过共源共栅放大器被放大和组合。 电压域可以堆叠并且可以由反馈回路控制。

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