US 12,278,693 B2
Stretched single optical span communications system and method avoiding hazardous power levels
Kevan Peter Jones, Ottawa (CA); Vipul Bhatnagar, Kensington, MD (US); Marco Gaudet, Ottawa (CA); and Francois Maurice Rheal Charron, Stittsville (CA)
Assigned to Ciena Corporation, Hanover, MD (US)
Filed by Ciena Corporation, Hanover, MD (US)
Filed on Dec. 6, 2022, as Appl. No. 18/075,847.
Prior Publication US 2024/0187123 A1, Jun. 6, 2024
Int. Cl. H04B 10/80 (2013.01); H04J 14/02 (2006.01)
CPC H04J 14/0297 (2013.01) [H04B 10/807 (2013.01); H04J 14/0293 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of implementing a stretched single optical communication span, the method comprising steps of:
receiving one or more optical signals from an optical fiber span having high loss of at least 40 dB;
adding a pilot signal to the one or more optical signals, subsequent to the receiving; and
amplifying the one or more optical signals and the pilot signal with a pre-amplifier that is an Erbium Doped Fiber Amplifier (EDFA) where the pilot signal is used for gain control of the pre-amplifier.