US 12,405,136 B2
Vibration sensing over passive optical networks (PONs) using forwarding optical phase retrieval and time-domain multiplexed (TDM) switching
Yue-Kai Huang, Princeton, NJ (US); Ezra Ip, West Windsor, NJ (US); and Ting Wang, West Windsor, NJ (US)
Assigned to NEC Corporation, Tokyo (JP)
Filed by NEC Laboratories America, Inc., Princeton, NJ (US)
Filed on Apr. 4, 2022, as Appl. No. 17/713,167.
Claims priority of provisional application 63/170,629, filed on Apr. 5, 2021.
Prior Publication US 2022/0326052 A1, Oct. 13, 2022
Int. Cl. H04B 10/00 (2013.01); G01D 5/353 (2006.01); H04B 10/071 (2013.01); H04B 10/61 (2013.01); H04J 14/00 (2006.01)
CPC G01D 5/35361 (2013.01) [H04B 10/071 (2013.01); H04B 10/61 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A system for vibration sensing over passive optical networks (PON) using forwarding optical phase retrieval and time domain multiplexed (TDM) switching, the system comprising:
an optical line terminal (OLT);
a plurality of optical network units (ONUs);
a passive optical network optically connecting the OLT to the ONUs);
wherein the plurality of ONUs each include an optical switch optically connected to the PON and to an optical reflector; and
said OLT is configured to provide a continuous optical phase interferometry signal to the PON and receive signals reflected by the plurality of optical reflectors.