DAS Fronthaul Solutions

Expanding Fiber Capacity with CWDM for Indoor DAS Connectivity

This Distributed Antenna Systems (DAS) application example illustrates how to overcome the fiber capacity challenge and transport four wireless services over a fiber link to two distinct Remote Access Units (RAU) using Coarse Wavelength Division Multiplexing (CWDM). Omnitron’s iConverter CWDM/X Multiplexers and xFF Transponders enable CWDM connectivity over existing fiber in the hi-rise building.

The DAS head end is located in the ground floor of the building (The Neutral Host location on the campus). The fiber ports on the line cards in the DAS head end support standard 1310 DAS Fronthaul with CWDMwavelengths. Fiber patch cables connect the DAS head end line cards to eight iConverter xFF Transponders installed in a high-density
19-Module Chassis.

The xFF transponders convert the fiber with standard wavelengths to CWDM wavelengths with standard wavelength SFPs and CWDM wavelength SFPs. The CWDM SFPs support specific wavelengths to enable connectivity to the eight 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 eight wavelengths over the CWDM Common Fiber Line that connects the Neutral Host location to the two distinct indoor DAS RAUs.

The CWDM Common Fiber Line runs up the building to an iConverter 4-Channel CWDM/X MUX with an Expansion Port installed on the second floor. The CWDM/X drops off four channels at this location that transport 3G and 4G/LTE from two different service providers. The Expansion port passes the four other channels up to the CWDM/X MUX on the fourth floor, where four more services are handed off to the RAU, expanding coverage to the top two floors.

This demonstrates how iConverter CWDM/X Multiplexers and xFF Transponders can be deployed to transport eight different services over one fiber strand. This saves the cost of installing new fiber in the building, which can include boring through concrete, cutting fire stops and getting permits.

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