US 11,838,048 B2
SD-FEC defect propagation across regeneration nodes in support of single and multi-carrier super channel protection in ROADM networks
Rajan Rao, Fremont, CA (US); Ramakrishna Pratapa, Bangalore (IN); Ramnarayan Srinivasan, Bangalore (IN); Ashok Kunjidhapatham, Devarachikkanahalli (IN); and Radhakrishna Valiveti, Union City, CA (US)
Assigned to Infinera Corporation, San Jose, CA (US)
Filed by Infinera Corp., Annapolis Junction, MD (US)
Filed on Aug. 20, 2020, as Appl. No. 16/998,159.
Claims priority of provisional application 63/000,449, filed on Mar. 26, 2020.
Claims priority of provisional application 62/962,385, filed on Jan. 17, 2020.
Prior Publication US 2021/0226697 A1, Jul. 22, 2021
Int. Cl. H04B 10/032 (2013.01); H04B 10/075 (2013.01); H04B 10/29 (2013.01)
CPC H04B 10/032 (2013.01) [H04B 10/075 (2013.01); H04B 10/29 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A regen node, comprising:
a coherent receiver having circuitry to convert a first optical signal in an optical layer of an optical network to a first digital data stream in a digital layer having one or more first soft decision forward error correction (SD-FEC) frame and a data traffic, the first SD-FEC frame including a SD-FEC overhead portion, the SD-FEC overhead portion including operation, administration, and maintenance (OAM) information, the OAM information of the SD-FEC overhead portion including bits, the bits including: a backward defect indication, a backward signal degrade, a remote backward defect indication, and a remote backward signal degrade, wherein the first optical signal is configured to travel in a direction from an upstream node to a downstream node;
a control module controlling the coherent receiver, the control module operable to:
extract a first fault signal based on the OAM information included in the FEC overhead portion of the first FEC frame;
generate a second fault signal based at least in part on the first fault signal; and
encode the second fault signal within a second SD-FEC frame with the data traffic into a second digital data stream on the digital layer; and
a coherent transmitter having circuitry to convert the second digital data stream into a second optical signal on the optical layer and to transmit the second optical signal to the downstream node.