Patent ID: 9344213
Filing Date: 2016-05-17
CPC Classification: H04B,H04J

Claim Text:
1. An optical WDM transmission system including: (a) a plurality of first optical transceivers at a first end of an optical WDM transmission link, each of the first optical transceivers including a tunable optical transmitter being configured to create a first digital optical channel signal within the bandwidths of a set of first optical channels of the optical WDM transmission system according to tuning control information, (b) multiplexing means for multiplexing the first digital optical channel signals into a first optical WDM signal, which is supplied to the first end of the optical WDM transmission link, (c) a plurality of second optical transceivers at a second end of the optical WDM transmission link, each of the second optical transceivers including an optical transmitter being configured to create a second digital optical channel signal within the bandwidth of a predetermined optical channel of a second set of optical channels of the optical WDM transmission system, (d) multiplexing means for multiplexing the second digital optical channel signals into a second optical WDM signal, which is supplied to the second end of the optical WDM transmission link, (e) demultiplexing means for demultiplexing the second optical WDM signal into the second digital optical channel signals and providing each of the second digital optical channel signals to a dedicated first optical transceiver, and (f) a central tuning device connected in the optical path between the first optical transceivers and the second optical transceivers, and configured to create the tuning control information for one or more selected or all of the first optical transceivers by (g) the central tuning device being further configured to supply the tuning control information to the at least one first transceiver by modulating the second optical WDM signal according to the tuning control information applying an amplitude modulation of the second optical WDM signal using a dedicated WDM tone frequency as a carrier frequency which is modulated according to the tuning control information.