Single-mode optical fiber
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Single-mode dual-fiber optical module with fiber optic cable
Single-mode dual-fiber optical modules use single-mode fiber optic cables with a narrow 9 µm core, typically OS1 or OS2, for separate transmit and receive fibers.
Core Characteristics
Single-mode dual-fiber modules operate with two separate fibers: one for transmitting (TX) and one for receiving (RX) signals . The fiber used is single-mode, featuring a small core diameter of approximately 9 micrometers (µm), which allows light to travel in a single path, minimizing modal dispersion and signal loss over long distances . This makes them ideal for high-speed, long-distance communication links.
Cable Types
- OS1 Fiber: Designed for indoor use, with a maximum attenuation of 0.4 dB/km at 1310 nm and 0.3 dB/km at 1550 nm, supporting distances up to 10 km at 10 Gbps .
- OS2 Fiber: Optimized for outdoor or long-haul applications, with lower attenuation (0.3 dB/km at 1310–1550 nm) and capable of transmitting data up to 40 km at 10 Gbps . Both OS1 and OS2 fibers are compatible with single-mode dual-fiber modules, depending on the required transmission distance and environmental conditions.
Wavelength and Connector Considerations
Single-mode dual-fiber modules typically operate at 1310 nm or 1550 nm wavelengths using laser-based light sources . They commonly use LC connectors for precise alignment with the small core, ensuring minimal signal loss. Mixing single-mode fiber with multimode modules is not recommended, as it can cause significant signal degradation .
Summary
For a single-mode dual-fiber optical module, the recommended fiber optic cable is a single-mode fiber (SMF) with a 9 µm core, usually OS1 for indoor short-range links or OS2 for outdoor long-range links. This configuration ensures optimal signal integrity, low attenuation, and compatibility with standard dual-fiber transceivers operating at 1310 nm or 1550 nm .
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