Transmission Characteristics of Radio Over Fiber (ROF) in Wireless Optical Communication Networks

For high bit rates and long haul optical communication systems using a single-mode fiber, a modulator with low chirp and small size are demanded. An electroabsorption modulator is very attractive because it has some advantages of not only low chirp and small size but also the elimination of polarization control through monolithic integration with a distributed feedback (DFB) laser. The modulation bandwidth of traditional lumped electro-absorption modulators (EAMs) is usually limited by the RC time constant, but the effective resistance R and capacitance C are not easily extracted for advanced device geometries. This paper has presented the important transmission characteristics of electrooptic absorption modulators such as transmission performance efficiency, insertion loss, extinction ratio, , over wide range of the affecting parameters.