Why are two strands of fiber used for a single fiber optic connection?

Question:

Why are two strands of fiber used for a single fiber optic connection?

• They prevent crosstalk from causing interference on the connection.
• The two strands allow the data to travel for longer distances without degrading.
• They allow for full-duplex connectivity.
• They increase the speed at which the data can travel.

Explanation: Light can only travel in one direction down a single strand of fiber. In order to allow for full-duplex communication two strands of fiber must be connected between each device.

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