Optical Network Link Budgets

EE 548Spring 2005

Reference Model

Link types

Link budget considerations Laser power Laser line width Link losses Bit rate Detector sensitivity

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

Short haul link

100 km, 8 wavelength WDM channels, 2.5 Gb/s

Long haul network case study

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: $$$