Theoretical Analysis of Polarization Insensitive InGaAsP Multiple-Quantum-Wells Eletroabsorption Modulators with Negative Chirp

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Polarization sensitivity of InGaAsP electroabsorption (EA) modulators is analyzed by the fractional-dimensional approach. Chirping parameter α is then calculated using Kramers-Krönig relations. It is found that polarization-insensitive and negative chirp operation can be realized simultaneously for InGaAsP multiple-quantum-wells (MQW) EA modulators with optimized well width and amount of strain. We propose a polarization-insensitive InGaAsP EA modulator with 9-nm-wide 0.38% tensile strained quantum wells. The chirping parameter α is estimated to be around -2 for the first 3 dB of transmission, while the modulation characteristics remain polarization-independent up to 80 kV/cm, corresponding to an extinction ratio of over 15 dB.