Optical Network Link Budgets

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Optical Network Link Budgets

• EE 548
• Spring 2005

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Reference Model
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Link types
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Link budget considerations

• Laser power
• Laser line width
• Link losses
• Bit rate
• Detector sensitivity

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Impairments

• Connector and splice losses
• Fiber attenuation
• Polarization mode dispersion (PMD)
• Chromatic dispersion
• Filter losses
• Splitter losses
• Isolator losses

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Short haul link
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100 km, 8 wavelength WDM channels, 2.5 Gb/s
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Long haul network case study
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Long haul versus ultra long haul WDM systems

• Long haul (LH)
• Amplifier spacing 80-120 km
• Regenerator spacing 400-600 km
• Capacity 80x10Gb/s
• Cost

• Ultra long haul (ULH)
• Amplifier spacing 80-120 km
• Regenerator spacing 2500-4000 km
• Capacity 56x10Gb/s
• Cost

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