US 12,222,548 B2
Optical waveguide coupling using fabricated waveguide coupling structures
Kelvin Prosyk, Luskville (CA); and Ronald Richard Millett, Ottawa (CA)
Assigned to Ciena Corporation, Hanover, MD (US)
Filed by Ciena Corporation, Hanover, MD (US)
Filed on Apr. 27, 2023, as Appl. No. 18/308,192.
Application 18/308,192 is a division of application No. 17/536,392, filed on Nov. 29, 2021, granted, now 11,988,872.
Prior Publication US 2023/0266536 A1, Aug. 24, 2023
Int. Cl. G02B 6/26 (2006.01); G02B 6/02 (2006.01); G02B 6/136 (2006.01); G02B 6/14 (2006.01)
CPC G02B 6/26 (2013.01) [G02B 6/02 (2013.01); G02B 6/136 (2013.01); G02B 6/14 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An article of manufacture, comprising:
a first waveguide structure supporting a first optical mode coupled to a waveguide coupling structure, the first waveguide structure comprising a first guiding core structure formed on a first cladding structure, and a second cladding structure formed on the first guiding core structure, where the first waveguide structure has a guiding ridge of a first width;
a second waveguide structure supporting a second optical mode coupled to the waveguide coupling structure, the second waveguide structure comprising a second guiding core structure formed on a third cladding structure, and a fourth cladding structure formed on the second guiding core structure, where the second waveguide structure has a guiding ridge of a second width;
where the waveguide coupling structure comprises
a transition structure having a third width larger than the first width and larger than the second width,
a multimode interference structure between the transition structure and the second waveguide structure having a width larger than the first width and smaller than the third width, and
an electrode covering at least a portion of the transition structure and at least a portion of the first waveguide structure and not covering any portion of the multimode interference structure.