By Charles H. Cox III
In contrast to books that concentrate on the units utilized in hyperlinks, similar to lasers and photodiodes, between others, this article specializes in the subsequent point. It covers the gathering of units that shape a hyperlink, how the person machine functionality impacts the hyperlink functionality, or the opposite. Analog hyperlinks are used for the distribution of cable television signs, and in conveying the indications to and from antennas (so referred to as antenna remoting). The layout of analog hyperlinks differs considerably from electronic hyperlinks that are basically utilized in telecommunications.
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Additional resources for Analog Optical Links: Theory and Practice
Like the diode laser, external modulators come in several different implementations. Modulators based on the Mach–Zehnder interferometer are by far the most common; however, modulators based on the directional coupler or the electroabsorption effect in semiconductors have been improving in performance and hence are increasing in popularity. Again since our goal in this chapter is to develop the basic device models upon which we can build the link design parameters in future chapters, we focus here on modeling the Mach–Zehnder modulator, both because of its popularity and because of its analytic tractability.
And Betts, G. E. 1997. Techniques and performance of intensity-modulation direct-detection analog optical links, IEEE Trans. , 45, 1375–83. Darcie, T. E. and Bodeep, G. E. 1990. Lightwave subcarrier CATV transmission systems, IEEE Trans. , 38, 524–33. Desurvire, E. 1994. Erbium-Doped Fiber Amplifiers, New York: Wiley. Gowar, J. 1983. 1. , Miyazawa, H. and Mitomi, O. 1994. 75 GHz broadband Ti:LiNbO3 optical modulator with ridge structure, Electron. , 30, 949–51. , Lanzisera, V. A. and Hill, P. M.
3 are presented in Chapter 4. As we can see, the fiber-coupled slope efficiencies obtained in practice are considerably lower than the maximum theoretical value. The primary reason for the low slope efficiency is the low coupling efficiency between the diode laser output and the fiber. In turn, the low coupling efficiency is due to the differences in optical mode size, shape and divergence between the laser waveguide and the fiber core. One of the other diode laser variations to be discussed below offers higher fiber coupling efficiency via its improved beam shape.