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:
Jan. 23, 2018
Filed:
May. 11, 2016
Lumentum Operations Llc, Milpitas, CA (US);
Barthelemy Fondeur, San Jose, CA (US);
Jinxi Shen, San Ramon, CA (US);
Leonid Frenkel, Palo Alto, CA (US);
Yimin Hua, Los Altos, CA (US);
David R. Walker, Ottawa, CA;
Yu Zhang, Kanata, CA;
Vlatko Milinkovic, Ottawa, CA;
Lumentum Operations LLC, Milpitas, CA (US);
Abstract
A tunable PLC optical filter having sequentially connected thermally tunable Mach-Zehnder (MZ) interferometers is described. The cascade of MZ interferometers, each having a free spectral ranges matching ITU frequency grid spacing, are tuned so as to have a common passband centered on the frequency of the signal being selected, while having at least one of the stopbands centered on any other ITU frequency. Any other optical channel that may be present at any other ITU frequency is suppressed as a result. Another MZ interferometer in series with the cascade of interferometers including an asymmetric or variable coupler, is tuned to have low transmission at the center frequency of the selected optical channel.