C.H. Cox III, G.E. Betts, and L.M. Johnson
Fiber-optic links are finding an increasing number of uses in analog RF systems. In most applications, information is impressed on the optical carrier by modulating the current of a semiconductor diode laser, a process referred to as direct modulation. Alternatively, the laser is operated continuously, and an external modulator is coupled to the laser output. Some advantages of the latter approach, which has been known for some time, are now being recognized.
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