公开(公告)号：US11243362B2

公开(公告)日：2022-02-08

申请号：US16918397

申请日：2020-07-01

Applicant: Juniper Networks, Inc.

Inventor： Brandon W. Buckley ,  Brian Robert Koch ,  John Garcia ,  Jared Bauters ,  Sudharsanan Srinivasan ,  Anand Ramaswamy

IPC: G02B6/42 ,  G02B6/43 ,  G02B6/30 ,  G02B6/12 ,  H04B10/40 ,  H04B10/25

Abstract: An example photonic integrated circuit includes a transmitter circuit with a optical communication path to an optical coupler configured to couple with an optical fiber. The optical communication path has a propagation direction away from the transmitter circuit and towards the optical coupler. A counter-propagating tap diverts light sent by a light source backward against the propagation direction of the optical communication path. A photodiode receives the diverted light and measures its power level. The photodiode generates a feedback signal for the optical coupler and provides the feedback signal to the optical coupler. The optical coupler receives the feedback signal and adjusts a coupling alignment of the optical communication path to the optical fiber based on the feedback signal, which indicates the measured power level of the diverted counter-propagating light.

公开(公告)号：US11070288B1

公开(公告)日：2021-07-20

申请号：US16907857

申请日：2020-06-22

Applicant: Juniper Networks, Inc.

Inventor： Robert S. Guzzon ,  Sean P. Woyciehowsky ,  Roberto Marcoccia ,  Anand Ramaswamy ,  John Garcia ,  Sudharsanan Srinivasan

IPC: H04B10/40 ,  H04B10/077

Abstract: An optical transceiver can be calibrated using an internal receiver side eye scan generator, and calibration values (e.g., modulator values) can be stored in memory for recalibration of the optical transceiver. The eye scan generator can receive data from the transmitter portion via an integrated and reconfigurable loopback path. At a later time, different calibration values can be accessed in memory and used to recalibrate the optical transceiver or update the calibrated values using the receive-side eye scan generator operating in loopback mode.