There are multiple fiber optic cables

Fiber optic cables come in multiple types, each designed for specific distances, bandwidths, and applications, including single-mode, multimode, and various OM and OS standards.

Fiber optic cables transmit data as light pulses through a core made of glass or plastic, surrounded by cladding that reflects light back into the core, allowing high-speed, long-distance, and interference-resistant communication . Unlike copper cables, which use electrical signals, fiber optics offer higher bandwidth and lower signal loss .

Single-Mode Fiber (SMF)

Single-mode fibers have a small core (around 5–10 microns) that allows only one light mode to propagate. This minimizes dispersion and supports long-distance transmission. There are two main types:

• OS1: Tight-buffered, indoor use, distances up to ~6 miles, throughput up to 10 Gbps .
• OS2: Loose-tube, outdoor use, distances up to ~125 miles, throughput up to 100 Gbps, supports multiple wavelengths and advanced technologies like WDM .

Multimode Fiber (MMF)

Multimode fibers have larger cores (50–62.5 microns) that allow multiple light modes, suitable for shorter distances. They are classified into OM standards:

• OM1: 62.5 µm core, up to 300 meters at 10 Gbps .
• OM2: 50 µm core, up to 550 meters at 10 Gbps .
• OM3: 50 µm core, up to 1000 meters at 10 Gbps, 400 meters at 40 Gbps .
• OM4: Enhanced version of OM3 for higher speeds and longer distances.
• OM5: Supports wideband multimode for multiple wavelengths, ideal for future high-speed networks .

Cable Configurations

Fiber optic cables can also be classified by strand count and direction:

• Simplex: Single fiber strand, used for one-way transmission or BiDi transceivers .
• Duplex: Two fiber strands, one for transmitting and one for receiving, standard for full-duplex communication .

Jacket Types

The outer jacket affects installation and environmental suitability:

• PVC: Common indoor use, flexible, cost-effective .
• LSZH: Low smoke, zero halogen, ideal for safety-critical indoor areas .
• Plenum-rated: Fire-resistant, suitable for air-handling spaces .

Summary

The variety of fiber optic cables exists to meet different distance, bandwidth, environmental, and application requirements. Single-mode fibers are optimal for long-distance, high-speed networks, while multimode fibers are cost-effective for shorter distances. OM and OS standards, along with cable configurations and jacket types, allow network designers to select the most suitable cable for each scenario .