Patent ID: 8300997

Claim:
A wavelength interleaver comprising a first interleaving unit, a second interleaving unit and an adapting waveguide coupled between the first interleaving unit and the second interleaving unit; both the first interleaving unit and the second interleaving unit including an input waveguide, an output waveguide and a filter coupled between the input waveguide and the output waveguide, the input waveguide of the first interleaving unit receiving an optical input signal with a particular wavelength for coupling to the filter of the first interleaving unit and outputting a first interleaving signal from the output waveguide of the first interleaving unit; the input waveguide of the second interleaving unit receiving the optical input signal through the adapting waveguide for coupling to the filter of the second interleaving unit and outputting a second interleaving signal from the output waveguide of the second interleaving unit, wherein the gap between the input waveguide and the filter of the first interleaving unit is a first gap and the gap between the filter and the output waveguide of the first interleaving unit is a second gap; wherein one of the first gap and the second gap is greater than a jumping threshold gap, and the other one is less than the jumping threshold gap.