Juniper Networks, Inc.

Openlight Photonics, Inc.

Sudharsanan Srinivasan

Anand Ramaswamy

John M Garcia

Brian Robert Koch

Jared Bauters

Brandon W Buckley

Roberto Marcoccia

Robert Silvio Guzzon

Sean P Woyciehowsky

Sean P Woychiehowsky

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.

Photonic integrated circuit with active alignment

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.

Optical transceiver loopback eye scans

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Goleta, CA, United States of America

Sudharsanan Srinivasan