Dense Wavelength Division Multiplexing - DSpace at CUSAT ...

Dense Wavelength Division Multiplexing
3.5 Transponders:-
Transponders convert incoming optical signals into the precise ITU-standard wavelengths
to be multiplexed, and are currently a key determinant of the openness of DWDM
systems.
Within the DWDM system a transponder converts the client optical signal from back to
an electrical signal and performs the 3R functions. This electrical signal is then used to
drive the WDM laser. Each transponder within the system converts its client’s signal to a
slightly different wavelength. The wavelengths from all of the transponders in the system
are then optically multiplexed. In the receiving direction of the DWDM system, the
reverse process takes place. Individual wavelengths are filtered from the multiplexed
fiber and fed to individual transponders, which convert the signal to electrical and drive a
standard interface to the client.
Operation of a Transponder Based DWDM System
Fig-18 Transponder Based DWDM system
The following steps describe the system shown in Figure:-
The transponder accepts input in the form of standard single-mode or multimode laser.
The input can come from different physical media and different protocols and traffic
types.
The wavelength of each input signal is mapped to a DWDM wavelength.
Division Of Computer Engineering, SOE 27