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    Polarization diversified wavelength domain demultiplexer with a single set of outputs
    53.
    发明授权
    Polarization diversified wavelength domain demultiplexer with a single set of outputs 有权

    公开(公告)号：US12052091B2

    公开(公告)日：2024-07-30

    申请号：US17407556

    申请日：2021-08-20

    Applicant: Acacia Communications, Inc.

    Inventor： Long Chen

    IPC: H04J14/06 ,  G02B6/293 ,  H04J14/02

    CPC classification number: H04J14/06 ,  G02B6/2938 ,  H04J14/0204 ,  H04J14/0215

    Abstract: In part, the disclosure relates to system. The system includes a polarization diversified wavelength demultiplexer (WDM). The polarization diversified wavelength demultiplexer includes a polarization beam splitter configured to output a first polarized signal and a second polarized signal based on an input signal; and a wavelength demultiplexer (WDM) having two inputs that are connected to the two outputs of the polarization beam splitter, and configured to output signals with a single set of outputs that carry signals of both polarizations, based on the first polarized signal from the first input and the second polarized signal from the second input.

    POLARIZATION DIVERSIFIED WAVELENGTH DOMAIN DE MULTIPLEXER WITH A SINGLE SET OF OUTPUTS
    56.
    发明申请
    POLARIZATION DIVERSIFIED WAVELENGTH DOMAIN DE MULTIPLEXER WITH A SINGLE SET OF OUTPUTS 有权

    公开(公告)号：US20230056068A1

    公开(公告)日：2023-02-23

    申请号：US17407556

    申请日：2021-08-20

    Applicant: Acacia Communications, Inc.

    Inventor： Long Chen

    IPC: H04J14/06 ,  G02B6/293 ,  H04J14/02

    Abstract: In part, the disclosure relates to system. The system includes a polarization diversified wavelength demultiplexer (WDM). The polarization diversified wavelength demultiplexer includes a polarization beam splitter configured to output a first polarized signal and a second polarized signal based on an input signal; and a wavelength demultiplexer (WDM) having two inputs that are connected to the two outputs of the polarization beam splitter, and configured to output signals with a single set of outputs that carry signals of both polarizations, based on the first polarized signal from the first input and the second polarized signal from the second input.

    Resistivity engineered substrate for RF common-mode suppression
    57.
    发明授权
    Resistivity engineered substrate for RF common-mode suppression 有权

    公开(公告)号：US11552710B2

    公开(公告)日：2023-01-10

    申请号：US16995732

    申请日：2020-08-17

    Applicant: Acacia Communications, Inc.

    Inventor： Long Chen ,  Leonard Jan-Peter Ketelsen

    IPC: H04B10/50 ,  H04B10/032 ,  H04B10/25 ,  H04J14/02

    Abstract: Aspects of the present disclosure are directed to a photonic integrated circuit (PIC) having a resistivity-engineered substrate to suppress radio-frequency (RF) common-mode signals. In some embodiments, a semiconductor substrate is provided that comprises two portions having different levels of resistivity to provide both suppression of common mode signals, and reduction of RF absorption loss for non-common mode RF signals. In such embodiments, a bottom portion of the semiconductor substrate has a low resistivity to suppress common mode via RF absorption, while a top portion of the semiconductor substrate that is adjacent to conductors in the IC has a high resistivity to reduce RF loss.

    Optical loopback circuits for transceivers and related methods
    58.
    发明授权
    Optical loopback circuits for transceivers and related methods 有权

    公开(公告)号：US11057114B2

    公开(公告)日：2021-07-06

    申请号：US15228462

    申请日：2016-08-04

    Applicant: Acacia Communications, Inc.

    Inventor： Long Chen ,  Christopher Doerr

    IPC: H04B10/075 ,  H04B10/50 ,  H04B10/40 ,  H04B10/035

    Abstract: Optical transceivers comprising optical loopback circuits are described. The optical transceiver may comprise a housing, which may host a transmitter, a receiver and the optical loopback circuit. The optical loopback circuit may be configured to route at least a portion of a modulated optical signal from the transmitter to the receiver. The optical loopback circuit may comprise tap couplers and/or optical switches. The optical transceiver may be switched between a normal mode and a calibration mode. The optical transceiver may maintain the same fiber connections even when the optical transceiver is switched from one mode to another. The transmitter, the receiver and the optical loopback circuit may be disposed on a common substrate, or on separate substrates.

    Suspended cantilever waveguide
    60.
    发明授权
    Suspended cantilever waveguide 有权

    公开(公告)号：US10571633B1

    公开(公告)日：2020-02-25

    申请号：US15852825

    申请日：2017-12-22

    Applicant: Acacia Communications, Inc.

    Inventor： Long Chen ,  Christopher Doerr ,  Li Chen

    IPC: G02B6/30 ,  G02B6/00

    Abstract: Cantilevered waveguides suspended above an air cavity in an underlying substrate are described. The waveguide is formed by patterning a waveguide layer in some embodiments, and the air cavity is formed by etching the substrate beneath the waveguide. The topside of the air cavity may be sealed by filling the openings used to etch the cavity with a sealant, such as optical epoxy. In some embodiments, the waveguide is a facet coupler, positioned at a chip facet.

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