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  With the widespread use of WDM systems, more and more problems are beginning to emerge, especially for long distance transmission WDM systems, where signal attenuation has become the primary problem. This is where the WDM optical amplifier repeater family ( OEO ) comes into play.   With the widespread use of WDM systems, more and more problems are beginning to emerge, especially for long distance transmission WDM systems, where signal attenuation has become the primary problem. Although some emerging amplifiers such as EDFA, FRA, SOA have solved the problem of signal attenuation, they are expensive in terms of cost, particularly dangerous in terms of use (FRA) and cannot be used when incompatible equipment needs to be connected (e.g. 1300nm carrier wavelength conversion for optical networks). Since we have different providers for our fibre networks and different standards, we need a certain device to transition from one fibre network to another. This is where the WDM optical...

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.