Optical Fiber Types
Multimode Fibers (MMF)
Standard Single-Mode Fiber (SMF)
Characteristics:
Small Core: 8 um
Small change in refractive index: 0.36 %
Cut-off wavelength: 1260 nm
Attenuation:
- 0.34 dB/km at 1310 nm
· - 0.20 dB/km at 1550 nm
Chromatic Dispersion:
· - Zero at 1310 nm
·
-17 ps/nm/km at 1550 nm
Dispersion Shifted Fiber (DSF)
Zero dispersion point can be shifted with modified waveguide
design. However at small dispersion non-linear effects increase.
Non-Zero Dispersion Shifted Fiber (NZ-DSF)
Dispersion is small but is not zero. Refractive index
profile can be modified.
Low Water Peak Fiber
The main advantage is no water
peak attenuation thus increasing the availability of spectral bandwidth.
Nowadays low water peak fibers allow the use of all CWDM wavelength channels.
