Abstract
Cellular-telephone systems are expanding into the newly available frequency range of 1.8–2.2 GHz (existing U.S. systems operate in the 900-MHz band) and also are going to a microcell architecture to accommodate the increasing number of users. Fiber-optic links will be used to connect the microcells to the base station if cost and performance problems can be solved. The rf signals will be in an FM or digital (for the CDMA standard) format, but the optical links will use analog intensity modulation to keep the microcell equipment as simple as possible. Because of signal fading, interference signals, and the large number of rf channels, the performance requirement for these links is high (e.g., 67- to 82-dB intermodulation-free dynamic range with 1.25-MHz noise bandwidth for a CDMA system).1 Conventional direct or externally modulated analog links can barely reach the bottom end of this performance range at 2 GHz.
© 1995 Optical Society of America
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