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Dynamic-range requirements for analog fiber-optic links in fiber-fed wireless microcells

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Abstract

The use of analog fiber-optic links as the connecting infrastructure in wireless microcellular networks has recently been proposed.1–3 Small (r ~ 100 m) microcells can serve a high density of mobile, users, and they require lower radio transmit power than do large (r ~ 1 km) macrocells in existing systems. The received rf signals are transmitted over an analog fiberoptic link to a central base station where all demultiplexing and signal processing are done. In this way, each remote antenna site simply consists of an analog optical transmitter, an amplifier, and an antenna, as shown in Fig. 1. Although the advantages are significant, the cost of the microcell antenna sites must be greatly reduced before the deployment of these networks is practical. The required dynamic range of the optical transmitter is a major factor in cost. Previous analysis on dynamic range requirements assumed an absolute spur-free condition for each channel and resulted in requirements of >100 dB-Hz2/3 for the optical transmitter. This paper shows that by accepting a blocking probability of <0.5%, a modest 85-dB-Hz2/3 dynamic-range link can be used to support 50 voice channels.

© 1995 Optical Society of America

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