Optical Millimeter-wave Generation Based On Periodone Oscillation In VCSELs Subject To Optical Injection And Its Application In ROF System

With the coming of information age, the demand of broadband multimedia services is going up quickly and at the same time, the application of millimeter-wave attracted much more attentions. The millimeter-wave with higher frequency has the advantages of broad band and large capacity, but in the air, millimeter-wave cannot transmit over a long distance due to large attenuation. Therefore, a new technology of radio over fiber (ROF), which integrates millimeter-wave wireless transmission and fiber wired transmission, has attracted considerable interests for such ROF systems are capable of realizing long distance transmission of millimeter-wave signals. Optical fiber has rich frequency bandwidth and the ability of anti-electromagnetic interference, while millimeter-wave can make wireless communication realize the larger capacity and the higher rate. The combination of them has promising prospects for communication development. At present, the methods of millimeter-wave generation include direct modulation, up and down frequency conversion, optical heterodyne and electro-absorption transceiver technology.In this paper, a novel method to generate millimeter-wave based on period-one oscillation in a slave VCSEL subject to optical injection from a master VCSEL is proposed. Based on spin-flip model (SFM), the dynamic behaviors of VCSELs subject to optical injection and millimeter-wave generated by VCSELs based on period-one oscillation have been researched. The results show that, through selecting proper system parameters, the slave VCSEL can be oscillate at period-one state with a dual-frequency optical spectrum distribution, then a low phase-noise millimeter-wave beat signal can be obtained by a high-speed photodiode. Through adjusting the injected strength and the frequency detuning between the slave and master VCSELs, optical millimeter-wave with different frequency can be obtained. Meantime, the transmission characteristics of millimeter-wave generated by above method in ROF system have also been researched. The influence of the fiber dispersion can be suppressed due to the generated millimeter-wave with single sideband (SSB) modulation performance, and the transmission performance of ROF system can be significantly improved.