The letter proposes a slab waveguide optical star coupler for multimode fibres, and shows the experimental results of a 15-port optical star coupler. The excess loss was about 2 dB and output power deviation among the ports was ±0.5 dB. Although the reported star coupler has 15 ports, there is no limit to the number of ports possible.
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Nosu et al. (1980) studied this question.