CWDM Access Networks

This is a drawing of multiple fiber runs that are transporting Carrier Ethernet business services to different customers in a multi-tenant building. There is typically equipment or a patch panel for the hand off at the basement of the building, and then the fiber is run up the building to each customer location. The fiber in the building may be owned by a riser management company, and there may be one or more service providers involved to deliver services.

iConverter GM4 NIDs are providing gigabit Carrier Ethernet service demarcation at each customer location in the building. iConverter XM5 NIDs can be deployed to deliver 10G services.

The Access Provider has eight fiber pairs running from the Central Office across town to the building, which limits the scalability to add new customers in the building or along the fiber route to the building.


To expand the capacity of the access network, an iConverter 8-Channel CWDM/X Multiplexer is installed at Central Office. CWDM SFPs are installed in the CO switch, and each SFP has a unique CWDM wavelength that corresponds with the appropriate channel port on the CWDM/X Multiplexer. Patch cables connect each port on the switch to the CWDM MUX, illustrated with different colors for each wavelength.

One CWDM Common Fiber access link transports the eight CWDM channels (wavelengths) to the building. Each CWDM channel is an independent data transport of up to 10G per channel. Another 8-Channel MUX is installed in the basement of the building to demultiplex the wavelengths. The CWDM channels are run up the fiber links in the building to each customer office (also color coded for each wavelength).

CWDM SFPs are installed in the iConverter GM4 NIDs at each customer location to convert the CWDM wavelengths to a copper RJ-45 connections or standard wavelength fiber for connectivity to customer equipment.

By deploying two iConverter 8-Channel CWDM/X Multiplexers and Omnitron’s CWDM SFPs, the Access Provider can repurpose the other seven fiber strands to add new customers along the fiber route or in the building, and generate additional revenue from the existing fiber plant.

Note that if each service is 10g, the Service Provider can transport 80G over the CWDM Common line.


This is a similar application, but the Access Provider does not own the demarcation equipment, so CWDM SFPs cannot be installed in the NIDs. The solution is to install the iConverter 8-Channel CWDM/X Multiplexers along with iConverter xFF Transponder modules in a 19-Module Chassis in the basement.

The xFF Transponder convert the CWDM channels to standard wavelengths, which are transported up the riser fiber with standard wavelengths to the iConverter GM4 NIDs that use standard wavelength SFPs.


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