Source: cirosantilli/fiber-optics-cables-often-come-in-pairs-because-it-is-needed-for-duplex

= Fiber optics cables often come in pairs because it is needed for duplex

* https://www.quora.com/What-is-the-purpose-of-having-two-cables-in-a-single-mode-fiber-optic-cable-one-for-sending-and-one-for-receiving-What-would-happen-if-we-only-used-one-of-them

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