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 wavelength range from 1250 nm to 1600 nm. The typical excess loss of the 4X4 WFC is less than 0.5 dB with less than +/- 2% deviations of coupling ratio for two of the four outputs, and less than +/- 10% for the other two outputs over the wavelength range from 1250 nm to 1600 nm. The package sizes are (Phi) 5X50 mm and (Phi) 6X140 mm, respectively, for the moment.
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