/port respectively. Moreover, the star-crossings are practically fabricated and experimentally characterized. The average measured insertion losses (ILs) are less than 0.75, 0.9 dB and 1.5 dB, while the crosstalks are sub-22.5 dB, -20 dB and -18 dB for other output ports over 60 nm bandwidth centered at 1550 nm wavelength.
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Lu et al. (2017) studied this question.
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