Frequency selective system
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United States of America Patent
Stats
-
Dec 7, 2021
Grant Date -
May 14, 2020
app pub date -
Jan 15, 2020
filing date -
Jan 25, 2018
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A frequency-selective system that may be used as, or as part of, an add/drop multiplexer. An input signal is fed to a Mach-Zehnder interferometer configured to drop, or suppress, by destructive interference, a signal component in a first frequency band from among a plurality of frequency bands. One or more bandpass filters in one arm of the Mach-Zehnder interferometer suppress other frequencies, outside of the first frequency band, so that signals at these other frequencies are not suppressed by destructive interference and are present at the output of the Mach-Zehnder interferometer. A coupler connected after the output of the Mach-Zehnder interferometer adds, into the signal path, a replacement for the dropped signal.
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