You have dark fiber or an optical route and need to carry far more traffic? WDM/DWDM multiplies channels over a single fiber — with no new infrastructure to lay.
Design & price my architecture →WDM (Wavelength Division Multiplexing) and its dense variant DWDM carry several wavelengths (colors) over a single fiber pair. Each channel carries 10G, 100G or more, multiplying the capacity of an existing link.
DWDM (dense) packs channels tightly to fit far more on one fiber (long-distance, high capacity); CWDM, more spaced, is simpler and cheaper over short distances.
Usually yes: DWDM runs on a fiber you light (dark fiber), or is bought as a 'wavelength' (lambda) service delivered by a carrier.
From dozens to over a hundred channels depending on the system, each at 100G or beyond. Sizing depends on distance and target bandwidth.
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