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One of the problems in the new generation of radio over fiber networks that requires to be concentrated, is decreasing the quantity of bit error rate in the lowest power penalty. This works studies a new technology for increasing the capacity of radio network backbone transmission channels by combining the two particular radio signal and optical power technologies. This paper also evaluates the results of down-link 5 Gbps OOK signal of four radio base stations over 50 km dense wavelength division multiplexing single mode fiber. The outcomes show that the total received optical power penalty is about 0.2 dB at bit error rate of 10-9 and quality factor of greater than 7. This amount of bit error rate can be supposed as a negligible value in the performance of radio over fiber system for multimedia and real time applications.