Fiber loss & link loss calculating
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The document discusses fiber optic losses including: - Fiber attenuation is lowest at 1550nm wavelength and highest at 1310nm, and varies by fiber type. Connector and splice losses are also provided. - Attenuation is the steady loss of signal power in fiber due to absorption and scattering. It is measured in decibels and can be converted to dB/km. The attenuation formula is given. - Link loss is the total measured power loss over a fiber span accounting for intrinsic attenuation and extrinsic discontinuities. It is wavelength dependent and measured in dB/km. - Loss budget is the total calculated power loss in an optical link from factors like fiber attenuation, splices, connectors and measurement
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Fiber loss & link loss calculating
- 1. Fiber Losses: Fiber Losses and different Wavelengths FiberType Wavelength FiberAttenuation ConnectorLoss Splice Loss Single Mode 1310 nm 0.35 0.5 db 0.05 db Single Mode 1550 nm 0.22 0.5 db 0.05 db Attenuation: The steady decrease or loss of signal power in an optical fiber, primarily due to absorption and scattering. Attenuation is a wavelength dependent, measured in DB and can be converted to db/km. Attenuation Formula: Attenuation(db) = 10 * log2 (P1/P2) In fiber optics attenuation can be measured as 10 times the log of ratio of input power (P1) to output power (P2) in watts. Input power is always grater the output power, therefore the ratio will be greater than 1 and attenuation will be a positive number. Attenuation (db) = 10 * log2 (P1/P2) Attenuation (db) = 10 * log2 (1000 uw/ 500 uw) Attenuation (db) = 10 * log2 (2) Attenuation (db) = 10 * 0.3 Attenuation (db) = 3 db Attenuation per km = 3db/15km = 0.2 db/km
- 2. Link Loss The total measured power loss of a fiber optic point to point span or link. The loss is a intrinsic attenuation and extrinsic discontinuities in a fiber optic cable. Link Loss is wavelength dependent and measured in decibels per kilometer or db/km. Link loss is the total loss of power over one link when all factors including fiber attenuation and splices, connectors, cable bends and other mechanical factors are measured.
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