S-72.227 Digital Communication Systems Fiber-optic Communications Fiber-optic Communications Frequency ranges in telecommunications Advantages of optical systems Optical fibers - basics single mode multimode Modules of a fiber optic link Optical repeaters - EDFA Dispersion in fibers
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Example: GaAlAs LED is used at l0=1 mm. This source has spectral width of 40 nm and its material dispersion is Dmat(1 mm)=40 ps/(nm x km). How much is its pulse spreading in 25 km distance?
Chromatic and waveguide dispersion cancel each other
Dispersion due to different mode velocities
980 or 1480 nm
WDM at l1, l2,... ln
,l1 ,l2 ,...ln
90 Gb/s - 2 discrete fibers and
3 EDFA repeaters required!
10 Gb/s/fiber - nine discrete fibers and
27 repeaters required!
Long-haul 10 Gb/s
System Capacity (Gb/s)
Long-haul 2.5 Gb/s
1994 1996 1998 2000