Single-mode duplex fiber optic cable interface

Single-mode duplex fiber optic cables feature a 9-micron core, support long-distance high-speed transmission, and consist of two fibers for simultaneous bi-directional communication. Core and Light PropagationSingle-mode fiber has a small core diameter of approximately 9 microns, allowing only a single light mode to propagate. This minimizes modal dispersion, enabling long-distance transmission with low signal loss and high bandwidth efficiency ( ).

The cladding surrounding the core is typically 125 microns in diameter and reflects light back into the core to maintain signal integrity ( ).

Duplex Configuration

A duplex cable contains two fibers, usually arranged side-by-side in a zipcord style. One fiber is used for transmitting data, and the other for receiving, enabling full-duplex communication. This configuration is essential for network devices such as switches, servers, and fiber modems that require simultaneous bi-directional data transfer ( ).

In contrast, simplex cables contain a single fiber for one-way transmission. Optical PerformanceSingle-mode duplex fibers are optimized for long-haul and high-speed networks, including telecommunications, data centers, and internet backbones. Typical specifications include: Attenuation: OS1 cables have 0.

4 dB/km at 1310 nm and 0. 3 dB/km at 1550 nm; OS2 cables have 0. 3 dB/km at 1310–1550 nm ( ).

Bandwidth: OS1 supports 200 MHz·km at 1310 nm, while OS2 supports 500 MHz·km at 1310 nm ( ). Wavelength compatibility: Designed for 1310 nm and 1550 nm regions, suitable for both analog and digital transmission ( ). Mechanical and Environmental AttributesSingle-mode duplex cables are available with various jackets for indoor and outdoor use: PVC: Standard indoor applications.

LSZ

H (Low Smoke Zero Halogen): Fire-safe indoor environments. Plenum-rated: Air-handling spaces with strict fire codes. Outdoor jackets: UV-resistant and water-blocking for external installations ( ).

ApplicationsSingle-mode duplex fiber is ideal for: Long-distance telecommunications and metro networks. High-speed data center interconnects. Full-duplex point-to-point links requiring minimal signal degradation over tens of kilometers ( ).

In summary, single-mode duplex fiber optic cables combine a small core for single-mode light propagation with two fibers for bi-directional communication, offering low attenuation, high bandwidth, and suitability for long-distance, high-speed network applications.