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.

公开(公告)号：US20240364428A1

公开(公告)日：2024-10-31

申请号：US18307864

申请日：2023-04-27

Applicant: GlobalFoundries U.S. Inc.

Inventor： Prateek Kumar Sharma ,  Avijit Chatterjee ,  Riddhi Nandi ,  Rupa Gopinath Minasamudram

IPC: H04B10/69 ,  H04B10/40

CPC classification number: H04B10/6971 ,  H04B10/40 ,  H04B10/691

Abstract: Disclosed are a multi-photodetector circuit and an optical receiver incorporating the circuit. The circuit includes parallel-connected photodiodes. In some embodiments, photodiodes are connected, in a same direction, between a positive power supply line and an output line. They receive equal power optical signals or a series of 1:2 optical dividers is employed so each photodiode receives a progressively lower power signal until the last two photodiodes, which receive equal power optical signals. In other embodiments, first photodiodes are connected, in one direction, between a positive power supply line and an output line and second photodiodes are connected, in an opposite direction, between a negative power supply line and the output line. First photodiodes receive equal power optical signals from an optical divider in response to an optical input signal and second photodiodes receive equal power optical signals from another optical divider in response to an inverted optical input signal.

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.