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We derive equations that quantify silicon Mach-Zehnder Interferometer (MZI)modulator impact upon optical link budget for NRZ transmissions based solelyupon modulator extinction ratio (ER), the efficiency-loss figure of merit(FOM), and peak-to-peak drive voltage (Vpp). Our modulator link penaltyequations transform the modulator efficiency-loss FOM from a simple devicequality metric into a means of predicting how design and technology choicesimpact system margin. Our results indicate that, with a 17.8 V-cm FOM and 1 Vppdrive, designing an MZI to have an ER anywhere within the large range from3.5-10 dB leads to nearly constant link margins, identical to within 0.5 dB.

A Figure of Merit Based Transmitter Link Penalty Calculation for CMOS-Compatible Plasma-Dispersion Electro-Optic Mach-Zehnder Modulators