Granted Patent
Utility
US 5,986,782 · App. 08/865,654
Signal-to-noise monitoring in WDM optical communication systems
Inventors:
Stephen B. Alexander, Henry H. Yaffe
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: May 29, 1997
Inventors
Stephen B. Alexander
Henry H. Yaffe
Assignee (at issue)
Ciena Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.