The applications and services of broadband wireless networks, including the existing WiMAX and upcoming LTE systems, has been developed and deployed rapidly owing to the needs of large bandwidth and flexible operation. However, the radio signals subject to the blocking by building envelops and may have poor indoor signal quality. To improve the coverage of broadband wireless networks inside buildings, the radio-over-fiber (RoF) technology can be used to enhance the indoor radio signal quality. This article introduces the RoF techniques and their applications. We implement an indoor RoF system with low-cost modules and demonstrate the signal quality enhancement by the technology. The goals are to make the RoF modules to be low cost and easy-installation solutions in the building.
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