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Publikováno v:
SPIE Proceedings.
A low-loss, high-quality 2X2 wavelength-flattered coupler (WFC) and a new 4X4 star WFC are presented. The typical excess loss of the 2X2 WFC with 50% coupling ratio is less than 0.2 dB with less than +/- 5% deviation of coupling ratio over the wavele