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    THERMAL STABILIZATION CIRCUIT FOR AN OPTICAL RING RESONATOR
    2.
    发明公开
    THERMAL STABILIZATION CIRCUIT FOR AN OPTICAL RING RESONATOR 审中-公开

    公开(公告)号：US20230341627A1

    公开(公告)日：2023-10-26

    申请号：US17729031

    申请日：2022-04-26

    Applicant: GlobalFoundries U.S. Inc.

    Inventor： Michal Rakowski ,  Vaibhav A. Ruparelia ,  Riddhi Nandi ,  Prateek K. Sharma ,  Avijit Chatterjee ,  Vasudeva Reddy KuppiReddy ,  Indranil Som

    IPC: G02B6/293 ,  G02B6/12

    CPC classification number: G02B6/2934 ,  G02B6/12026 ,  G02F2201/58 ,  H01S3/083

    Abstract: Disclosed is a thermal stabilization circuit including a heater, which is adjacent and thermally coupled to a closed-curve waveguide of an optical ring resonator, and an analog feedback circuit, which includes a fully autonomous analog feedback loop from a drop port of a bus waveguide of the optical ring resonator to the heater. This analog feedback circuit is configured to dynamically control the electrical power provided to the heater and, thereby to dynamically control the thermal output of the heater in order to tune the ring resonance wavelength to the operating laser wavelength. The analog feedback circuit is further configured to be independent of input power, to be power efficient, to have a relatively small footprint, to have a tunable time constant and to facilitate adjustable wavelength locking. Also disclosed is a device (e.g., a ring-based transceiver or the like), which includes multiple optical ring resonators and corresponding thermal stabilization circuits.

    Thermal stabilization circuit for an optical ring resonator
    8.
    发明授权
    Thermal stabilization circuit for an optical ring resonator 有权

    公开(公告)号：US12222589B2

    公开(公告)日：2025-02-11

    申请号：US17729031

    申请日：2022-04-26

    Applicant: GlobalFoundries U.S. Inc.

    Inventor： Michal Rakowski ,  Vaibhav A. Ruparelia ,  Riddhi Nandi ,  Prateek K. Sharma ,  Avijit Chatterjee ,  Vasudeva Reddy KuppiReddy ,  Indranil Som

    IPC: G02B6/293 ,  G02B6/12 ,  G02F1/01 ,  H01S3/083

    Abstract: Disclosed is a thermal stabilization circuit including a heater, which is adjacent and thermally coupled to a closed-curve waveguide of an optical ring resonator, and an analog feedback circuit, which includes a fully autonomous analog feedback loop from a drop port of a bus waveguide of the optical ring resonator to the heater. This analog feedback circuit is configured to dynamically control the electrical power provided to the heater and, thereby to dynamically control the thermal output of the heater in order to tune the ring resonance wavelength to the operating laser wavelength. The analog feedback circuit is further configured to be independent of input power, to be power efficient, to have a relatively small footprint, to have a tunable time constant and to facilitate adjustable wavelength locking. Also disclosed is a device (e.g., a ring-based transceiver or the like), which includes multiple optical ring resonators and corresponding thermal stabilization circuits.

    Optical device with low-loss thermally tunable closed-curve optical waveguide
    9.
    发明授权
    Optical device with low-loss thermally tunable closed-curve optical waveguide 有权

    公开(公告)号：US11803012B2

    公开(公告)日：2023-10-31

    申请号：US18055576

    申请日：2022-11-15

    Applicant: GlobalFoundries U.S. Inc.

    Inventor： Michal Rakowski ,  Petar I. Todorov ,  Yusheng Bian ,  Won Suk Lee ,  Asif J. Chowdhury ,  Kenneth J. Giewont

    IPC: G02B6/125 ,  G02F1/01 ,  G02B6/136 ,  G02B6/12

    CPC classification number: G02B6/125 ,  G02F1/0147 ,  G02B6/136 ,  G02B2006/12061 ,  G02B2006/12147

    Abstract: Disclosed is a photonic structure and associated method. The structure includes a closed-curve waveguide having a first height, as measured from the top surface of an insulator layer, and an outer curved sidewall that extends essentially vertically the full first height (e.g., to minimize signal loss). The structure includes a closed-curve thermal coupler and a heating element. The closed-curve thermal coupler is thermally coupled to and laterally surrounded by the closed-curve waveguide and has a second height that is less than the first height. In some embodiments, the closed-curve waveguide and the closed-curve thermal coupler are continuous portions of the same semiconductor layer having different thicknesses. The heating element is thermally coupled to the closed-curve thermal coupler and thereby indirectly thermally coupled to the closed-curve waveguide. Thus, the heating element is usable for thermally tuning the closed-curve waveguide via the closed-curve thermal coupler to minimize any temperature-dependent resonance shift (TDRS).

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