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:
Dec. 25, 2012
Filed:
Feb. 20, 2009
Jinxi Shen, San Ramon, CA (US);
Jyoti K. Bhardwaj, Cupertino, CA (US);
Barthelemy Fondeur, San Jose, CA (US);
Douglas E. Crafts, Los Gatos, CA (US);
Robert J. Brainard, Sunnyvale, CA (US);
Boping Xie, Hayward, CA (US);
David J. Chapman, San Jose, CA (US);
Jinxi Shen, San Ramon, CA (US);
Jyoti K. Bhardwaj, Cupertino, CA (US);
Barthelemy Fondeur, San Jose, CA (US);
Douglas E. Crafts, Los Gatos, CA (US);
Robert J. Brainard, Sunnyvale, CA (US);
Boping Xie, Hayward, CA (US);
David J. Chapman, San Jose, CA (US);
JDS Uniphase Corporation, Milpitas, CA (US);
Abstract
A tunable PLC optical filter having sequentially connected thermally tunable Mach-Zehnder (MZ) interferometers is described. The MZ interferometers, having 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. The PLC chip, including a zero-dispersion lattice-filter interleaver stage, a switchable fine-resolution stage and, or a retroreflector for double passing the filter, is packaged into a hot-pluggable XFP transceiver package. A compensation heater is used to keep constant the amount of heat applied to the PLC chip inside the XFP package, so as to lessen temperature variations upon tuning of the PLC optical filter.