07-02-2013, 02:29 PM
DENSE WAVELENGTH DIVISION MULTIPLEXING
[attachment=50021]
Wavelength division Multiplexing
WDM is a technology which multiplexes multiple optical
carrier signals on a single optical fiber by using different
wavelengths of laser light to carry different signals.
HISTORY OF DWDM ::
64 to 160 channels in 1550 nm window
Next generation DWDM system
Channel spacing of 0.2 to 0.4 nm
16 to 40 channels in 1550nm window
DWDM (Dense wdm)
Channel spacing of 0.8 to 1.6
2 to 8 channels in 1550nm window
Passive (or) 2nd generation WDM
Channel spacing of~ 3.2nm
2 channels WWDM (Wideband WDM)
1310nm & 1550nm
WAVELENGTH CONVERTING TRANSPONDERS
Wavelength converting transponders translate the transmitted
wavelength of a client-layer signal into one of the DWDM system's
equivalent internal wavelengths.
In the mid-1990s,wavelength converting transponders rapidly took
on the additional function of signal regeneration.
Signal regeneration in transponders quickly evolved through 1R
to 2R to 3R .
CHANNEL SPACING
The minimum frequency separation between two different
multiplexed signals is known as the Channel Spacing. Since the
wavelength of operation is inversely proportional to the frequency,
a corresponding difference is introduced in the wavelength of each
signal.
[attachment=50021]
Wavelength division Multiplexing
WDM is a technology which multiplexes multiple optical
carrier signals on a single optical fiber by using different
wavelengths of laser light to carry different signals.
HISTORY OF DWDM ::
64 to 160 channels in 1550 nm window
Next generation DWDM system
Channel spacing of 0.2 to 0.4 nm
16 to 40 channels in 1550nm window
DWDM (Dense wdm)
Channel spacing of 0.8 to 1.6
2 to 8 channels in 1550nm window
Passive (or) 2nd generation WDM
Channel spacing of~ 3.2nm
2 channels WWDM (Wideband WDM)
1310nm & 1550nm
WAVELENGTH CONVERTING TRANSPONDERS
Wavelength converting transponders translate the transmitted
wavelength of a client-layer signal into one of the DWDM system's
equivalent internal wavelengths.
In the mid-1990s,wavelength converting transponders rapidly took
on the additional function of signal regeneration.
Signal regeneration in transponders quickly evolved through 1R
to 2R to 3R .
CHANNEL SPACING
The minimum frequency separation between two different
multiplexed signals is known as the Channel Spacing. Since the
wavelength of operation is inversely proportional to the frequency,
a corresponding difference is introduced in the wavelength of each
signal.