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Dispersion of microwave-modulated optical signals

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1 Author(s)
Hakki, Basil W. ; AT&T Bell Labs., Breinigsville, PA, USA

Experimental and analytical evaluation of dispersion effects that control intersymbol interference in gigabit, single-mode-fiber, digital systems is described. Both direct modulation of distributed-feedback (DFB) lasers and external modulation by Mach-Zehnder modulators are studied. The experiment uses sinusoidal modulation of the light at a microwave frequency, e.g. 5 GHz, and the subsequent measurement of signal gain or loss in a dispersive fiber. For DFB lasers, the transmission measurements are used to derive the transient and adiabatic components of chirp. It is shown that, for external modulation at 5 GHz, the 1.55- mu m optical signals suffer relatively little dispersion loss for transmission distances up to 60 km. Analytical solutions for waveform distortion are given for external modulation and show good agreement with measurements.

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Lightwave Technology, Journal of  (Volume:11 ,  Issue: 3 )