In this paper, Particle Swarm Optimization, a nature-based algorithm is executed on the radio over fibre system. Phase noises which generate on the transmitter side of a communication system are eliminated by optimising the values of linewidths of the laser diode and RF Oscillator. Carrier to Noise ratio is considered as the main parameter and it is optimized with reference to a predefined level of 28dB. The practical ranges of 100 to 624 MHz and 0.1 to 10 Hz are taken into account for linewidths of the Laser Diode and Radio Frequency oscillator respectively. The changes in the optimised values are observed in the fibre of 2 Km, 10 Km and 30 Km. The optimum value of linewidth is calculated to be around 0.1 Hz for RF Oscillator and 500 MHz for the laser diode. The noise keeps on increasing with the increase in the length of fibre and PSO has been used to counter the phase noises by optimising the linewidth values.

RoF-Radio over Fiber, SSMF-Single Standard Mode Fiber, MZM-Mach Zehnder Modulator, CNR-Carrier to Noise Ratio, OSSB-Optical Single Sideband Signal, CS-Central Station, BS-Base Station, PSO-particle swarm optimization, pbest- personal best, gbest-global best

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