Which connector is duplex and commonly used for simple fiber links?

• A. MPO
• B. SC
• C. ST
• D. LC

Answer: (D)

Duplex means two fibers in a single connector, used for two-way communication between devices. For simple fiber links, you want a compact, two-fiber interface that’s easy to mate and install. The LC connector fits this perfectly: it’s a small form-factor, duplex connector with two fibers in one housing (TX and RX) and a push-pull latch, making it ideal for high-density patch panels and routine two-fiber links common in data centers and generic setups.

Other options don’t match as well for this scenario. MPO is designed for many fibers at once, not just a pair. SC and ST are typically larger and more associated with simplex (one fiber) configurations, or are older styles that aren’t as favored for simple two-fiber links today. So the duplex LC is the best fit for simple two-fiber connections.