US 11,750,318 B1
Edge-wavelength-switching system, associated optical network, and failover recovery method thereof
Luis Alberto Campos, Superior, CO (US); Jing Wang, Broomfield, CO (US); Zhensheng Jia, Superior, CO (US); Jim Campanell, Louisville, CO (US); Carmela Stuart, Broomfield, CO (US); and Haipeng Zhang, Broomfield, CO (US)
Assigned to Cable Television Laboratories, Inc., Louisville, CO (US)
Filed by CABLE TELEVISION LABORATORIES, INC., Louisville, CO (US)
Filed on Mar. 8, 2022, as Appl. No. 17/689,100.
Application 17/689,100 is a division of application No. 16/667,401, filed on Oct. 29, 2019, granted, now 11,271,669.
Claims priority of provisional application 62/751,825, filed on Oct. 29, 2018.
Int. Cl. H04B 10/079 (2013.01); H04J 14/02 (2006.01); H04B 10/25 (2013.01); H04B 10/03 (2013.01); H04Q 11/00 (2006.01)
CPC H04J 14/0212 (2013.01) [H04B 10/03 (2013.01); H04B 10/07953 (2013.01); H04B 10/25891 (2020.05); H04Q 11/0005 (2013.01); H04Q 2011/0015 (2013.01); H04Q 2011/0016 (2013.01); H04Q 2011/0081 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A failover recovery method for an optical network including a central edge wavelength switching system (EWSS) having an optical switch, a wavelength-selective switch (WSS) connected to a plurality of local ports in operable communication with a plurality of optical transceivers, respectively, disposed throughout the optical network, the method comprising steps of:
monitoring, by the EWSS, bit-error rates (BERs) received from one or more of the plurality of optical transceivers at respective local ports of the plurality of local ports;
determining a BER severity from a temporal sequence of BERs generated from a first transceiver of the plurality of optical transceivers at a first premise host equipment optically coupled to a first port of the plurality of ports, wherein the EWSS is disposed at a network node of the optical network, and wherein the network node optically coupled to a hub of the optical network by way of a first optical-fiber path; and
rerouting optical signals transmitted between the first premise host equipment and the hub, when the BER severity exceeds a predetermined value, by causing the optical switch to change between a parallel mode and a crossed mode, such that the optical signals travel along a second optical-fiber path differing from the first optical-fiber path.