What is the key difference between a fiber optic mechanical connector and a splice?

• A. Connectors are larger than splices
• B. Mechanical connectors are removable, while splices are permanent welds
• C. Connectors require adhesives
• D. Splices require expensive tools

Answer: (B)

The essential idea is whether the joint is reversible or permanent. A mechanical connector is designed to be unplugged and reconnected, keeping the fiber ends aligned in a ferrule so you can reuse it and reconfigure as needed. A splice, by contrast, permanently bonds the fiber ends together—often by fusion welding or a fixed mechanical join—so the path becomes a single continuous fiber that's not meant to be opened again. That permanence is what sets splices apart from connectors. Other details like size or tool requirements can vary and don’t define the difference between a removable connector and a permanent splice.