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Laser Power Requirement

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(joined January 2016)
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hello, i want to ask again. In my project, i made a DWDM-ROF (Radio Over Fiber) scheme with 20 channels with bitrate each channels it’s about 25Gbps and 65 km fiber length. The problems is still difficult for me to set or to define the best output power of CW laser with these spesification so i can reach the minimum value of Q factor. So, is there any formula or some technical spesification to calculate the appropriate output power for CW laser?

thanks and regards
hermawan.w

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