CPC G02B 6/12007 (2013.01) [G02B 6/1228 (2013.01); G02B 6/13 (2013.01); G02B 6/2938 (2013.01)] | 20 Claims |
1. A structure for a wavelength division multiplexing filter, the structure comprising:
a first waveguide core including a first section, a second section, and a first longitudinal axis, the first section and the second section each having a first notched sidewall and a second notched sidewall opposite to the first notched sidewall, the first section of the first waveguide core including a first taper and a first plurality of projections that project outwardly from the first taper transverse to the first longitudinal axis, and the second section of the first waveguide core including a second taper and a second plurality of projections that project outwardly from the second taper transverse to the first longitudinal axis; and
a second waveguide core positioned with a first offset in a first direction relative to the first section and the second section of the first waveguide core and with a second offset in a second direction relative to the first section and the second section of the first waveguide core, the second direction transverse to the first direction.
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