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A novel optical TE/TM mode splitter was fabricated using Ti-diffused LiNbO3 coupled waveguides. This splitter can spatially separate the TE and TM mode components and is compatible with single-mode fiber systems. Crosstalk less than −20 dB was realized at 1.15-μm wavelength. Optical insertion loss was 1.7 dB.
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Osamu Mikami (1980) studied this question.
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