Consider a Mach–Zehnder modulator as in Figure 2.23 with a Pockels coefficient r = 3.4 × 10−12 m V−1 and a branch thickness d = 5 μm. For a maximum half-wave voltage of Vπ = 10 V, what should be the minimum branch length L for modulator operation at 1.55 μm wavelength (nr = 2.2)?
Figure 2.23
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