Download e-book for kindle: Analog Optical Links: Theory and Practice by Charles H. Cox III

By Charles H. Cox III

Not like books that target the units utilized in hyperlinks, resembling lasers and photodiodes, between others, this article makes a speciality of the subsequent point. It covers the gathering of units that shape a hyperlink, how the person equipment functionality impacts the hyperlink functionality, or the opposite. Analog hyperlinks are used for the distribution of cable television indications, and in conveying the indications to and from antennas (so known as antenna remoting). The layout of analog hyperlinks differs considerably from electronic hyperlinks that are basically utilized in telecommunications.

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1992 L. , 1991 Y. , 1997 J. , 1994 S. 8 3 10 12 12 13 18 20 20 22 28 30 33 40 form of impedance matching between the modulation source and the laser to satisfy the definition of available power. A simple, but as we will see inefficient, way to implement the impedance match is to add a resistor, RMATCH , in series with the laser. The value of this resistor is chosen such that RS = RL + RMATCH . Putting all the foregoing together results in the circuit shown in Fig. 4. 4 Schematic diagram of the lumped-element, low frequency circuit model of a modulation source; an ideal, impedance matching resistor and a diode laser.

3, respectively. The corresponding bandwidths for each of the devices in Fig. 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.

Cox, 1996, Fig. 16. ) To formulate the incremental slope efficiency for the DCM, we begin by representing the sin2 term in a power series (Gradshteyn and Ryzhik, 1965): sin2 x = ∞ (−1)k+1 1 22k−1 x 2k . (2k)! e. 19). After some algebraic simplification 44 Link components and their small-signal electro-optic models we get π pD,O ∼ = TFF PI 2 2 1− π2 12 1+3 vM VS 2 . 21) As we did for the Mach–Zehnder modulator, we again assume that the modulator electrode voltage can be represented as the sum of a bias voltage, VM , and a smallsignal modulation voltage, vm ; vM = VM + vm .

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