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A polarisation-independent electro-optically tunable wavelength filter using passive polarisation splitters and strain-induced polarisation mode conversion in LiTaO3 is demonstrated. Tuning of the centre wavelength from 655 to 692 nm is realised. An optical bandwidth (FWHM) of 11 nm and a tuning rate of 0.4 nm/V are obtained.
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Tang et al. (1994) studied this question.
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