The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2019
Filed:
Sep. 09, 2016
Ray Chung, Vancouver, CA;
Zeqin LU, Vancouver, CA;
Hasitha Jayatilleka, Vancouver, CA;
Mohammed Wadah AL Taha, Port Moody, CA;
Sudip Shekhar, Vancouver, CA;
Shahriar Mirabbasi, Vancouver, CA;
Lukas Chrostowski, Vancouver, CA;
Ray Chung, Vancouver, CA;
Zeqin Lu, Vancouver, CA;
Hasitha Jayatilleka, Vancouver, CA;
Mohammed Wadah Al Taha, Port Moody, CA;
Sudip Shekhar, Vancouver, CA;
Shahriar Mirabbasi, Vancouver, CA;
Lukas Chrostowski, Vancouver, CA;
Huawei Technologies Canada Co., Ltd., Kanata, CA;
Abstract
A method and apparatus for monitoring and feedback control of a photonic switch such as 2×2 Mach-Zehnder Interferometer switch. Optical signals at an input and an output of the switch are monitored via optical taps. A sinusoidal time-varying phase shift is applied to one of the monitoring signals. An optical combiner then combines the monitoring signals. A photodetector monitors output of the optical combiner to provide a feedback signal. The amplitude of the feedback signal due to the time-varying phase shift increases with the amount of input signal present in the output signal. When the input signal is to be routed to the output (e.g. for a bar state), a controller manipulates the switch to maximize feedback signal amplitude. When the input signal is to be routed to a different output (e.g. for a cross state), the controller manipulates the switch to minimize feedback signal amplitude.