A variable optical mode generator in an integrated-optic multimode waveguide is proposed and fabricated. It consists of a power divider, controllable parallel phase retarders, and a mode combiner. In this device, a desired output mode is generated by controlling the relative phase differences among the arms. The operation of device has been confirmed by observation of the output mode patterns at a wavelength of 1.55$ mu$m.
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Yeo et al. (2006) studied this question.
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