Attenuation
Attenuation determines either how much fiber you can use in an application or how much light your optical source must produce.
Normal attenuation of optical fiber
Standard single-mode optical fibers typically exhibit attenuation around 0.2–0.35 dB/km, depending on wavelength, while multimode fibers have higher attenuation, generally 0.5–3 dB/km.
Typical Attenuation Values
- Single-mode fiber (SMF): At 1550 nm, attenuation is approximately 0.22 dB/km, and at 1310 nm, around 0.35 dB/km under normal conditions .
- Multimode fiber (MMF): Attenuation is higher due to modal dispersion, typically 0.5–3 dB/km depending on core size and wavelength .
- Plastic optical fiber: Can exceed 300 dB/km, making it suitable only for very short distances .
Causes of Attenuation
Attenuation arises from both intrinsic and extrinsic factors:
- Intrinsic losses: Include Rayleigh scattering, caused by microscopic density variations in the glass, and material absorption, where the glass absorbs light energy and converts it to heat. Water contamination in the fiber can create absorption peaks, notably near 1380 nm due to hydroxyl ions .
- Extrinsic losses: Result from bending, splicing, and connector imperfections. Microbends or tight bends can scatter light out of the core, while poor splices or dirty connectors add additional dB losses .
Measurement Standards
Attenuation is measured in decibels per kilometer (dB/km) using standardized methods:
- IEC 61300: Defines procedures for measuring fiber attenuation, including Light Source Power Meter (LSPM) and Optical Time Domain Reflectometry (OTDR) methods. Connector losses are limited to 0.75 dB per connector and splice losses to 0.1 dB for professional installations .
- IEC 60793-1-40: Provides uniform requirements for measuring attenuation, including spectral modeling and backscattering methods for single-mode fibers .
Calculating Total Link Loss
The total attenuation of a fiber link can be calculated as: Total Link Loss (dB) = Cable Attenuation + Connector Loss + Splice Loss Where Cable Attenuation is the product of the fiber's attenuation coefficient (dB/km) and the fiber length (km), . Understanding these values and standards is essential for designing fiber optic networks, ensuring signal integrity, and performing accurate troubleshooting.
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