Electroabsorption modulators with polarization-independence of transmission (TE/TM sensitivity23 GHz/V. Polarization insensitivity of modulator transmission and chirp is demonstrated. Technical realization has been done in ridge waveguide technology with low-pressure MOVPE, reactive ion etching (RIE) for semiconductor etching and polyimide for planarization.
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Weinmann et al. (1996) studied this question.