Why DWDM Systems Need OTU

Optical Transponder Units (OTUs) are an integral part of DWDM transmission systems. Do you know why an OTU is needed for DWDM systems? 



Role of OTU

Realizes wavelength conversion, as well as single/multi-mode conversion and regenerative amplification of optical signals.


Operating principle of OTU

Wavelength conversion is achieved using the optical-electrical-optical conversion method. Firstly, the optical signal received by the client optical module from the client equipment is converted into an electrical signal, which is amplified, shaped/clocked and then the electrical signal is modulated to the output of the laser. The output is a DWDM wavelength, so that multiple DWDM signals can be merged into a single fibre for transmission via Mux.



Non-DWDM optical modules cannot be transmitted via DWDM technology without an OTU.

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