DAS Fronthaul Solutions

Expanding Fiber Capacity with CWDM for Outdoor DAS Connectivity

This Distributed Antenna Systems (DAS) application example illustrates how to overcome fiber capacity challenges by transporting four wireless services over a fiber link using Coarse Wavelength Division Multiplexing (CWDM). Omnitron’s iConverter CWDM/X Multiplexers and xFF Transponders enable CWDM connectivity from a DAS head end to Remote Access Units (RAU) over an existing campus fiber link.

The DAS head end is located at a Neutral Host location on the campus, as shown in the upper left. The fiber ports on the line cards in the DAS head end support standard 1310 wavelengths. Fiber patch cables connect the DAS head end line cards to iConverter xFF Transponders installed in a high-density 19-Module Chassis. The four xFF transponders convert the fiber from standard wavelengths to CWDM wavelengths with Small Form Pluggable (SFP) transceivers. Standard wavelength SFPs and CWDM wavelength SFPs are installed in each of the xFF transponders. The CWDM SFPs support specific wavelengths to enable connectivity to the matching channel ports on the iConverter CWDM/X multiplexer with fiber patch cables (shown in different colors to represent the CWDM wavelengths). Omnitron’s CWDM transceivers have color-coded latch handles for easy identification. The CWDM/X multiplexes the four wavelengths over the CWDM Common Fiber Line that connects the Neutral Host location to the Outdoor DAS Radio Access Units (RAU) installed on light poles.

DAS Fronthaul with CWDM outdoor campus

At the outdoor DAS remote end of the CWDM common fiber link, a 5-Module Chassis is populated with matching CWDM/X multiplexer and xFF transponder modules that enable connectivity between the CWDM channel ports and the standard wavelength connectors on the RAU equipment that are deployed in the DAS.

This architecture enables multiple services to be transported to a DAS remote location over existing fiber infrastructure.


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