US 12,323,185 B2
Method for determining actual values of one or more characteristics of a phase-modulated optical signal
Tobias Fehenberger, Munich (DE)
Assigned to ADVA Optical Networking SE, Meiningen (DE)
Filed by ADVA Optical Networking SE, Meiningen (DE)
Filed on May 11, 2022, as Appl. No. 17/742,005.
Claims priority of application No. 21176721 (EP), filed on May 28, 2021.
Prior Publication US 2022/0385370 A1, Dec. 1, 2022
Int. Cl. H04B 10/079 (2013.01); H04B 10/27 (2013.01); H04B 10/548 (2013.01); H04J 14/02 (2006.01)
CPC H04B 10/27 (2013.01) [H04B 10/0793 (2013.01); H04B 10/0795 (2013.01); H04B 10/548 (2013.01); H04J 14/02 (2013.01); H04J 14/0227 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for controlling performance of an optical channel in an optical network, wherein in the optical network pairs of nodes of the network are associated with distinct bands of optical channels used for communication between the pairs of nodes, wherein the method comprises the steps of:
(a) determining actual values of one or more characteristics of a phase-modulated optical signal comprising: acquiring the phase-modulated optical signal by a non-linear device, generating an electrical spectrum based on the acquired phase-modulated optical signal, and extracting actual values of one or more characteristics of the phase-modulated optical signal from the electrical spectrum;
(b) for each of the one or more characteristics, determining whether the actual value is within a predetermined range for the characteristic; and
(c) taking an action if, for one or more of the one or more characteristics, the actual value is outside of the predetermined range for the characteristic, to control performance of the optical channel, wherein:
the one or more characteristics of the phase-modulated optical signal include a symbol rate, a roll-off factor and a modulation format;
the phase-modulated optical signal is inputted into an optical channel by a third-party terminal, wherein the optical channel is part of an optical fiber network of a communication service provider, wherein the third-party terminal is used by a third party that has paid to use the optical fiber network;
the non-linear device is a photodiode; and
the action is configured to ensure that the third party using the third-party terminal does not use more resources than what they paid for and to prevent degradation of quality of transmission of neighboring wavelength-division multiplexing channels due to linear and non-linear interference.