Passive mux/demuxes are an excellent solution for bandwidth expansion when faced with fiber shortages. In many situations, a simple point-to-point connection would suffice, as in this 40-channel DWDM diagram below:
However, certain applications and network topologies would benefit from alternative architectures. In this article, we’ll guide you through two common architectures and in which circumstances to consider using them.
NOTE: Both architectures depicted below can be used for both single fiber and dual fiber deployments in many channel configurations.
Option 1: Cascade
A cascaded architecture is ideal for providing service from a central office across a large, sparsely-populated area. 40 channels from a central office are muxed together and sent over a common pair of fibers. At the first location, 8 channels are demuxed and delivered, while the remaining 32 are sent through the express port of that mux/demux to the next location, at which the next 8 are delivered, and so on.
Option 2: Hub and Spoke
If you need to cover a higher-density urban/suburban neighborhood from a central location, consider the hub and spoke architecture. Starting from the same 40 channel mux/demux, the channels are muxed together and sent to a band splitter at a distribution point, which separates the channels into sets of 8, which are then sent to their respective locations.