SMF - Single Mode Fiber

Over View

  • An optical fiber is a single, hair-fine filament drawn from molten silica glass. These fibers are often used as the transmission medium in high-speed, high-capacity communications systems that convert information into light, which is then transmitted via fiber optic cable.
     

  • Optical fiber is composed of three key elements: Core, Cladding and Coating. The core is the innermost part of the fiber through which light pulses are guided. Cladding surrounds the core to keep light in the center of the fiber. The core and cladding are inseparable layers of glass. The coating is a layer of polymer that surrounds the cladding to protect the glass.
     

  • Optical fiber cable may be Single mode, Multimode or a hybrid of two or more media types.

Single Mode Fiber

Due primarily to the small core size, SMF requires high end lasers and precise components, which typically result in overall higher system costs. However, the distance and bandwidth capabilities make SMF the primary choice for long haul networks.

Multimode fiber cables include the following:

  • 8-10 micron core, 125 micron cladding

  • Typical light source is a laser operating at 1310 nm or 1550 nm

  • Conventional Single mode

  • Reduced Water Peak (RWP) Single mode improved attenuation performance in the E band (around 1383 nm)

  • Flex RWP improved bend performance

  • Non-Zero Dispersion Shifted (NZDS) Single mode optimized for transmission in the C band (around 1550 nm)