公开(公告)号：US20220120880A1

公开(公告)日：2022-04-21

申请号：US17494151

申请日：2021-10-05

Applicant: Seagate Technology LLC

Inventor： Adam R. Bush ,  Kevin A. Gomez

IPC: G01S7/497 ,  G01S7/487 ,  G01S7/493

Abstract: An optical engine for a LiDAR system comprises an analog detection channel comprising an avalanche photodiode (APD) optically coupled to light receiving optics and bias circuitry coupled to the APD and configured to adjust a bias set point (BSP) of the APD. Sensors sense disparate environmental factors that impact optical engine performance. Memory stores pre-established APD BSP data including a nominal APD BSP and pre-established dependence data characterizing the impact of disparate environmental factors on the nominal APD BSP. A controller generates, using sensor signals, in-field dependence data characterizing the impact the disparate environmental factors currently have on the nominal APD BSP, calculate an updated APD BSP using the in-field and pre-established dependence data, and shift the BSP of the APD from the nominal APD BSP to the updated APD BSP to enhance optical engine performance.

公开(公告)号：US20230062555A1

公开(公告)日：2023-03-02

申请号：US17462170

申请日：2021-08-31

Applicant: Seagate Technology LLC

Inventor： Adam R. Bush ,  Walter R. Eppler ,  Kevin A. Gomez

IPC: G01S7/4865 ,  G01S7/487 ,  G04F10/00

Abstract: An optical receiver includes a parasitic current compensation circuit having a reference diode, a sense avalanche photodiode (APD), at least one DC voltage source, and a measurement node. The at least one DC voltage source is configured to generate a first DC bias voltage that varies over time and drives the reference diode, and generates a second DC bias voltage that varies over time and drives the sense APD. A reference parasitic current travels through the reference diode based on the first DC bias voltage. A sense current travels through the sense APD based on the second DC bias voltage and exposure of the sense APD to a light signal. The measurement node receives a sense photocurrent, which is generated by the sense APD in response to the exposure of the sense APD to the light signal, the sense photocurrent including the sense current less the reference parasitic current.