Systems and methods for modular deployment and upgrade of multiple optical spectrum bands in optical transmission systems

An optical system supporting a modular deployment and upgrade of optical spectrum, the optical system comprising:

• C-Band ingress ports;
• a C-Band demultiplexer and a C-Band multiplexer coupled to the C-Band ingress ports;
• a C-Band egress port coupled to the C-Band demultiplexer and the C-Band multiplexer;
• a first Amplified Spontaneous Emission (ASE) source coupled to the C-Band multiplexer and configured to provide channelized ASE loading for one or more C-Band channels via the C-Band multiplexer;
• an upgrade port and an L-Band egress port;
• a second ASE source coupled between the L-Band egress port and the upgrade port and configured to provide bulk ASE loading for all of the L-Band;
• and
• an L-Band upgrade module including:
• L-Band ingress ports;
• an L-Band demultiplexer and an L-Band multiplexer coupled to the L-Band ingress ports;
• an L-Band egress port coupled to the L-Band demultiplexer and the L-Band multiplexer, and the L-Band egress port further selectively coupled to the upgrade port;
• and
• a third ASE source coupled to the L-Band multiplexer and configured to provide L-Band channelized ASE loading via the L-Band multiplexer, wherein the second ASE source and the third ASE source perform a coordinated handoff to switch from the bulk ASE loading to the L-Band channelized ASE loading.

An optical node supporting a modular deployment and upgrade of optical spectrum, the optical node comprising:

• one or more C+L-Band amplifier modules;
• and
• a modular base module including a plurality of ports and which is configured to interface one or more C-Band optical modems;
• wherein, in an initial deployment configuration, the modular base module includes
• channelized Amplified Spontaneous Emission (ASE) loading for select channels in the C-Band via a first ASE noise source coupled to a multiplexer for the C-Band,
• bulk ASE loading over the L-Band via a second ASE noise source coupled to an L-Band output, and
• an upgrade port for connection to an L-Band upgrade module,
• wherein the L-Band upgrade module selectively connects to the upgrade port to provide an L-Band upgrade configuration, wherein, from the initial deployment configuration to the L-Band upgrade configuration, the L-Band upgrade module and the modular base module coordinate transition of the bulk ASE loading to the L-Band channelized ASE loading via a third ASE noise source, wherein the transition includes the bulk ASE loading being turned down while the L-Band channelized ASE loading is turned up.