公开(公告)号：US20230299856A1

公开(公告)日：2023-09-21

申请号：US17694866

申请日：2022-03-15

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： David Ritter Thomas ,  Laurel Abeyta ,  Jason Douglas Jung ,  Kit MacCarthy Morton ,  Daniel Alan Berkram

IPC: H04B10/69

CPC classification number: H04B10/697 ,  H04B10/691

Abstract: Examples described herein relate to a method and a system for removing the common-mode current. The receiver includes a photodetector, a common-mode adjustment circuit, an analog front-end, an eye scan circuit, and a control unit. The photodetector generates an input photocurrent responsive to a received optical signal. The common-mode adjustment circuit generates an adjusted input current based on the input photocurrent. The analog front-end generates a differential voltage based on the adjusted input current. Based on the differential voltage, the eye scan circuit generates an eye scan information defining a first outer eye and a second outer eye in an eye diagram. The control unit tunes the common-mode adjustment circuit based on a relative height metric of a first height of the first outer eye and a second height of the second outer eye to remove a portion of the common-mode current from the input photocurrent.

公开(公告)号：US11558119B2

公开(公告)日：2023-01-17

申请号：US17303184

申请日：2021-05-24

Applicant: Hewlett Packard Enterprise Development LP

Inventor： James Donald Regan ,  Mauricio Madiedo ,  David Ritter Thomas

IPC: H04B10/12 ,  H04B10/50 ,  H04B10/572

Abstract: According to an example, a transmitter transmits a plurality of optical signals of multiple wavelengths via an optical link to a receiver. An optical link tuner coupled to the optical link groups the plurality of optical signals into a first group of optical signals and a second group of optical signals, where the first group of optical signals has a first wavelength range and the second group of optical signals has a second wavelength range. The optical link tuner adjusts link tuning parameters associated with the first group of optical signals during a first phase, such that the second group of optical signals is propagated to the receiver without modifications to link tuning parameters associated with the second group, where during the first phase the receiver is to detect unplugging of the optical link based on the second group of optical signals.

公开(公告)号：US20200162168A1

公开(公告)日：2020-05-21

申请号：US16194591

申请日：2018-11-19

Applicant: Hewlett Packard Enterprise Development LP

Inventor： David Ritter Thomas ,  William Lee

IPC: H04B10/69

Abstract: Examples described herein relate to calibration of an optical communications link. Data signals received over the optical communications link are measured to obtain an eye scan. A height of an upper eye region and a height of a lower eye region are compared in the eye scan. A common mode calibration value is adjusted based on any difference in the heights. A common mode adjustment circuit is then controlled based on the common mode calibration value. The common mode adjustment circuit is configured to remove a direct current bias within a receiver for the optical communications link.

公开(公告)号：US20230291475A1

公开(公告)日：2023-09-14

申请号：US17694021

申请日：2022-03-14

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： David Ritter Thomas ,  Kit MacCarthy Morton ,  Michael Alex Schroeder ,  Mauricio Madiedo ,  Leah Rozewski

IPC: H04B10/294 ,  H04B10/50

CPC classification number: H04B10/2942 ,  H04B10/50572 ,  H04B10/2941

Abstract: Examples described herein relate to a receiver training method. To configure a static gain for at least one static gain amplifier and a target amplitude for a dynamic gain amplifier, a dynamic gain adjustment is disabled and the dynamic gain amplifier is configured to apply a predetermined fixed gain to the static gain amplified signal to generate a test signal. Furthermore, an effective static gain magnitude for at least one static gain amplifier and an effective amplitude for the test signal are determined based on a link performance metric. The static gain is set to the effective static gain magnitude, and a target amplitude for the dynamic gain amplifier is set to the effective amplitude. Then, the dynamic gain adjustment may be enabled to maintain an amplitude of a dynamic gain amplified signal at an output of the dynamic gain amplifier at the target amplitude by varying the dynamic gain.

公开(公告)号：US10651949B1

公开(公告)日：2020-05-12

申请号：US16194591

申请日：2018-11-19

Applicant: Hewlett Packard Enterprise Development LP

Inventor： David Ritter Thomas ,  William Lee

IPC: H04B10/06 ,  H04B10/69

Abstract: Examples described herein relate to calibration of an optical communications link. Data signals received over the optical communications link are measured to obtain an eye scan. A height of an upper eye region and a height of a lower eye region are compared in the eye scan. A common mode calibration value is adjusted based on any difference in the heights. A common mode adjustment circuit is then controlled based on the common mode calibration value. The common mode adjustment circuit is configured to remove a direct current bias within a receiver for the optical communications link.

公开(公告)号：US12003279B2

公开(公告)日：2024-06-04

申请号：US17694866

申请日：2022-03-15

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： David Ritter Thomas ,  Laurel Abeyta ,  Jason Douglas Jung ,  Kit Maccarthy Morton ,  Daniel Alan Berkram

IPC: H04B10/69

CPC classification number: H04B10/697 ,  H04B10/691

Abstract: Examples described herein relate to a method and a system for removing the common-mode current. The receiver includes a photodetector, a common-mode adjustment circuit, an analog front-end, an eye scan circuit, and a control unit. The photodetector generates an input photocurrent responsive to a received optical signal. The common-mode adjustment circuit generates an adjusted input current based on the input photocurrent. The analog front-end generates a differential voltage based on the adjusted input current. Based on the differential voltage, the eye scan circuit generates an eye scan information defining a first outer eye and a second outer eye in an eye diagram. The control unit tunes the common-mode adjustment circuit based on a relative height metric of a first height of the first outer eye and a second height of the second outer eye to remove a portion of the common-mode current from the input photocurrent.

公开(公告)号：US11646756B1

公开(公告)日：2023-05-09

申请号：US17645341

申请日：2021-12-21

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Kit MacCarthy Morton ,  Jason Douglas Jung ,  Jeffrey Zenning Chow ,  Alexander David Wilson ,  David Ritter Thomas

IPC: H04B10/69 ,  H04B1/10 ,  H04L25/49

CPC classification number: H04B1/10 ,  H04B10/695 ,  H04L25/4927

Abstract: Examples relate to determining a sampling threshold of a receiver (e.g., SERDES receiver). In particular, the examples relate to determining an updated sampling threshold of the receiver based on a reference sampling threshold of the receiver. A controller may determine the reference sampling threshold based on the training sequence and determine an upper voltage level and a lower voltage level of a voltage range based on the reference sampling threshold of the receiver. The controller then narrows the voltage range based on upper voltage accumulated hit rate and a lower voltage accumulated hit rate to determine the updated sampling threshold of the receiver.

公开(公告)号：US20220376795A1

公开(公告)日：2022-11-24

申请号：US17303184

申请日：2021-05-24

Applicant: Hewlett Packard Enterprise Development LP

Inventor： James Donald Regan ,  Mauricio Madiedo ,  David Ritter Thomas

IPC: H04B10/50 ,  H04B10/572

Abstract: According to an example, a transmitter transmits a plurality of optical signals of multiple wavelengths via an optical link to a receiver. An optical link tuner coupled to the optical link groups the plurality of optical signals into a first group of optical signals and a second group of optical signals, where the first group of optical signals has a first wavelength range and the second group of optical signals has a second wavelength range. The optical link tuner adjusts link tuning parameters associated with the first group of optical signals during a first phase, such that the second group of optical signals is propagated to the receiver without modifications to link tuning parameters associated with the second group, where during the first phase the receiver is to detect unplugging of the optical link based on the second group of optical signals.