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Passive Optical Networks (PONs) typically use long-range singlemode fiber to reduce or eliminate intermediate powered switches - this collapses the network into many connections to a single switch stack, and can eliminate the need for power and cooling of network closets, which become patchbays (no active electronics - thus, passive.)

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Bi Directional Visible Light Communication

"Proposed bidirectional network architecture combining the [visible light communication] VLC access network and the [time-wavelength-division-multiplexed passive optical network] TWDM-PON. Central of …
David Cary's user avatar