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Radio over fiber (ROF) systems are attractive solutions for broadband wireless access network due to its capacity for supporting high speed data rate transmission. And optical heterodyning is a promising method to generate microwave signals used in radio over fiber systems. Beating of the different modes of an optical frequency comb can produce microwave signals of different frequencies. And improving the properties of the optical frequency comb by injection locking can lead to the improvement of the noise characteristics of the microwave signal. In Our experiment, a tunable laser was used as the master laser, and a distributed feedback laser was used as the slave laser. The frequency comb was produced by two cascaded phase modulators. By adjusting the wavelength of the master laser and the injection power, we achieved a 17dB improvement on the signal to noise ratio of the microwave signal. Keywords-injection locking; optical frequency comb; microwave; noise-signal ratio

Improvement in the Noise Characteristics of Optical Frequency Comb Based on Injection Locking