What types of interfaces do dual-fiber optical modules have

Dual-fiber optical modules typically use duplex LC interfaces, connecting two separate fibers—one for transmitting and one for receiving data.OverviewDual-fiber optical modules, also known as standard duplex transceivers, are designed to use two separate fibers: one dedicated to transmitting (TX) and the other to receiving (RX) signals. This configuration ensures high transmission stability and supports single-wavelength bidirectional communication, making it ideal for long-distance backbone networks and high-bandwidth applications .Common Interface TypesDuplex LC (Lucent Connector): The most widely used interface for dual-fiber modules. It features two fiber ports side-by-side, typically with a 1.25mm ceramic ferrule, and is compatible with standard SFP, SFP+, and SFP28 modules . Duplex LC connectors are compact, allowing high port density in data centers and enterprise switches.Duplex SC (Subscriber Connector): Less common in modern high-density deployments but still used in telecom and FTTH (Fiber to the Home) applications. SC connectors have a larger 2.5mm ferrule and a square plastic body, providing robustness for “last mile” connections .Fiber Type CompatibilityDual-fiber modules can operate over:Single-mode fiber (SMF): Typically used for long-distance links, supporting wavelengths such as 1310nm, 1550nm, or CWDM/DWDM channels .Multimode fiber (MMF): Used for shorter distances, often within a data center or campus, with wavelengths like 850nm for OM3/OM4 fibers .SummaryIn practice, duplex LC interfaces dominate dual-fiber optical modules due to their compact size, ease of deployment, and compatibility with standard SFP/SFP+ modules. SC interfaces are occasionally used in legacy or telecom-specific setups. The dual-fiber design ensures minimal signal interference and reliable high-speed communication, making it suitable for large-scale network deployments .