Question
Explain the sub-carrier multiplexing (SCM) scheme used in optical communication.
Why should it be used in conjunction with WDM?
Answer :
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Subcarrier Multiplexing (SCM) is a method for combining (multiplexing) many different communications signals so that they can be transmitted along a single optical fiber. SCM (also known as SCMA, SubCarrier Multiple Access) is used in passive optical network (PON) access infrastructures as a variant of wavelength division multiplexing (WDM).
SCM follows a different approach compared to WDM. In WDM an optical carrier is modulated with a baseband signal of typically hundred of Mbit/s. In an SCMA infrastructure, the baseband data is first modulated on
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