Wavelenght multiplexing
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Transcript of Wavelenght multiplexing
WAVELENGHT DIVISIONMULTIPLEXING
BY
PANKIL AGRAGAL
MULTIPLEXING
What is multiplexing
Why we use multiplexing?
Advantages of Multiplexing
WAVE LENGTH DIVISION MULTIPLEXING
WDM consider as FDM coupled with TDM
Use wave length in place of frequencies
Use fiber optical cable
WAVE LENGTH DIVISION MULTIPLEXING
Combine multiple light source
Use Prism
Prism bends a beam of light based on the angle of incidence and frequency
TYPES OF WDM
Metro WDM (<200 km)
Long-haul or regional WDM (200 km to 800 km)
Extended long-haul WDM (800 km to 2000 km)
Ultra-long-haul WDM (>2000 km)
FREQUENCY BANDS
O-band (original)— A range from 1260 nm to 1360 nm
E-band (extended)— A range from 1360 nm to 1460 nm
S-band (short wavelength)— A range from 1460 nm to 1530 nm
C-band (conventional)— A range from 1530 nm to 1565 nm
FREQUENCY BANDS
L-band (long wavelength)— A range from 1565 nm to 1625 nm
U-band (ultra-long wavelength)— A range from 1625 nm to 1675 nm
UNIDIRECTIONAL WDM
BIDIRECTIONAL WDM
Band-Separation Method : the transmitted channels are divided in two or four groups known as sub-bands
To prevent the adjacent bands from interfering with each other guard bit is used
Interleaving-Filter Method : Interleaved channels are used in both directions of transmission.
Even channels travel east to west, whereas odd channels travel west to east.
Circulator Method : optical circulators are used.
A circulator is a multiport device that allows signals to propagate in certain directions based on the port that the signal came from.
EXTENSION OF WDM
Coarse WDM : Coarse Wave Division Multiplexing combines up to 16 wavelengths onto a single fiber
20nm Spacing suited for the short-haul transport of data, voice,
video, storage, and multimedia services
Dense WDM : Dense Wave Division Multiplexing combines up to 96 wavelengths onto a single fiber
0.8 nm spacing suited for the short-haul and the long-haul
transport of data, voice, video, storage, and multimedia services
THANK YOU
FIBER OPTICAL CABLE
How light travel from source to destination
Advantages
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