Fig. 1 | Nature Communications

Fig. 1

From: Bidirectional wavelength-division multiplexing transmission over installed fibre using a simplified optical coherent access transceiver

Fig. 1

Schematic of a typical passive optical access network. Optical line terminal (OLT), installed by a service provider, distributes a TDM or WDM signal via ODN, consisting of transmission fibre and passive splitters/combiners. ODN consolidates the backhaul and access spans which are typically up to 100 km. The optical network units located at business/building/premise, or home receive the transmitted signal and provide bandwidth to each fixed (e.g., personal computers, and IP-TVs) and mobile (e.g., smartphones, tablets, and laptops) end user supported by the network. ONU: optical network unit, FTTx: Fibre-to-the-Business/Building/Premise/Home

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