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中文摘要：
将三频光外差法运用到光纤无线系统（Radio—over—Fiber）中，研究了一种采用三频光外差法产生毫米波的RoF系统。在中心站产生三路不同波长的窄线宽光波，其中两路光波分别由光调制器调制上数据信号，另外一路作为本振光。经光纤传输后，再通过基站光探测器的探测混频产生两个不同频率的毫米波信号。结果表明，采用三束波长为1549．68nm、1549．52nm和1550nm的光波可产生两路分别携带10Gb／s下行基带数字信号的频率为40GHz和60GHz的毫米波，并实现基带信号在单模光纤中20□的传输。
英文摘要：
To implement the three-frequency optical heterodyne method in the Radio-over-Fiber systems, a RoF system that uses three-frequency optical heterodyne method to generate millimeter wave is studied. In a central station （CS）, three narrow linewidth lights with different wavelengths are generated, and two of them will be modulated with optical modulators to carry data, while the other will be kept as local light. After traveling though the optical fiber, then detected by photodet-ector at the base station （BS） to generate millimeter-wave at two different frequencies. The result shows, the implementation with three light waves with wavelengths at 1549.68nm, 1549.52nm, and 1550nm can create two millimeter-waves that carry 10Gbit/s down link baseband digital signals at 40Ghz and 60Ghz respectively and realize a 20kin transmission of baseband signals via single mode optical fiber.
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