Push-pull polarization conversion using novel asymmetric coupled quantum-well structures

TitlePush-pull polarization conversion using novel asymmetric coupled quantum-well structures
Publication TypeJournal Article
Year of Publication2006
AuthorsRistic, S., and N. A. F. Jaeger
JournalPhotonics Technology Letters, IEEE
Pagination316 -318
Date Publishedjan.
Keywordsaluminium compounds, asymmetric coupled quantum-well structures, effective refractive index, effective-mass envelope-function approximation, electro-optical effects, electro-optical modulation, electrorefraction effect, gallium arsenide, gallium compounds, III-V semiconductors, indium compounds, InGaAlAs-InAlAs, optical design techniques, polarization conversion modulator, quantum well devices, refractive index, TE mode, TM mode

A novel type of polarization conversion modulator, employing multiple repetitions of two novel InGaAlAs-InAlAs asymmetric coupled quantum-well structures, is proposed. The novelty of the proposed design is that, via the electrorefraction effect, it allows for a change in the TM mode's effective refractive index, which is opposite in sign to the change in the TE mode's effective refractive index. Numerical simulations based on the effective-mass envelope-function approximation show that the modulator provides not only an electrorefractive response similar to other quantum-well modulators but can also provide a low-chirp push-pull polarization modulation.


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