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Abstract-Optically-powered radio over fiber remote units have been designed and constructed for distributed antenna system applications using separate fibers for power and signal transmission.The feasibility of this approach has been investigated through a series of transmission measurements, based on the IEEE 802.11g wireless local area networking standard at a frequency of 2.5 GHz using 64QAM OFDM modulation at 54 Mb/s. These measurements show that high quality multi-level signal transmission is possible with modest levels of optical power at the central unit. For example, an EVM of around 3 % has been achieved for an RF output power of 0 dBm using a central unit optical power of 250 mW over a link length of 300 m.Index Terms-Distributed antenna systems, power over fiber, radio over fiber, wireless local area networks.

Abstract-Recent work on radio over multimode fiber transmission, for the support of wireless LANs and current cellular systems operating at below 6 GHz, has shown that excellent performance (e.g. spur-free dynamic range well in excess of 100 dB.Hz2/3) can be achieved. However, here it is shown that for multi-system operation, spurious emissions may be more of a restriction than meeting good signal quality requirements (such as low error vector magnitude). Initial results are reported for error vector magnitude and adjacent channel leakage for UMTS transmission over a radio over multimode fiber link with a multi-system remote antenna unit, with conformance to standards being demonstrated.