When selecting a fiber optic adapter, there are two main factors to consider:cable type and material of alignment sleeve. What Are Fiber Connectors? What Are Fiber Connectors? A fiber optic connector is a mechanical device used to. 📦 For purchasing, use the RP Photonics Buyer's Guide for fiber-optic adapters. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. They are also divided into single-mode and multimode types based on their distinct characteristics.