What is an advantage of single-mode fiber with a large mode field diameter (MFD)?

The advantage of single-mode fiber with a large mode field diameter (MFD) being easier to splice and connectorize is accurate because a larger MFD generally results in a more forgiving alignment when connecting fibers. This is due to the larger effective area through which light travels, which decreases the sensitivity of the fiber to misalignment during splicing and connectorization. As a result, the chances of loss or reflection at the connections can be reduced, making the process more reliable and user-friendly for technicians.

Other options, while potentially relevant in their own contexts, do not capture the primary advantage of a large MFD. For example, single-mode fibers are typically known for their long-distance data transmission capabilities, but the signal quality being better over long distances is more a function of the fiber type rather than the MFD specifically. Likewise, while installation costs are important factors to consider, the diameter of the mode field doesn't directly correlate to cheaper installation processes. Finally, the thermal performance of the fiber is also a function of the materials used in its construction, rather than the MFD. Thus, the choice confirming the easier splicing and connectorizing directly ties back to the characteristics of large MFD single-mode fibers, making it the strongest answer.