US 12,451,987 B1
Controlling transient effects in spectral changes due to channel drop scenarios
Diego Rodrigo Villafani Caballero, Dublin (IE); and Lee Richardson, Dublin (IE)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Dec. 15, 2022, as Appl. No. 18/082,413.
Int. Cl. H04J 14/02 (2006.01)
CPC H04J 14/0212 (2013.01) 20 Claims
OG exemplary drawing
 
1. An optical add-drop multiplex system, the system comprising:
a plurality of wavelength selective switches comprising:
a first wavelength selective switch configured to drop a drop signal from a first input signal of the first wavelength selective switch to provide a demultiplexed signal; and
a second wavelength selective switch configured to add an add signal to a second input signal of the second wavelength selective switch to provide a multiplexed signal;
an amplified spontaneous emission source configured to generate a noise signal;
a plurality of photodetectors comprising:
a first photodetector configured to monitor the first input signal; and
a second photodetector configured to monitor the add signal; and
a plurality of optical switches comprising:
a first optical switch positioned inline with the first input signal; and
a second optical switch positioned inline with the add signal;
wherein the first optical switch switches an input to the first wavelength selective switch from the first input signal to the noise signal responsive to the first photodetector detecting a signal drop in the first input signal;
wherein the second optical switch switches an input to the second wavelength selective switch from the add signal to the noise signal responsive to the second photodetector detecting a signal drop in the add signal.