US 12,366,709 B2
Resonant interferometric coupler and method of modifying an optical signal using same
Marco Liscidini, Pavia (IT); Matteo Menotti, Toronto (CA); Zachary Vernon, Toronto (CA); and Alice Viola, Alagna (IT)
Assigned to XANADU QUANTUM TECHNOLOGIES INC.
Filed by XANADU QUANTUM TECHNOLOGIES INC., Toronto (CA)
Filed on May 26, 2023, as Appl. No. 18/324,572.
Claims priority of provisional application 63/346,930, filed on May 30, 2022.
Prior Publication US 2023/0384523 A1, Nov. 30, 2023
Int. Cl. G02B 6/293 (2006.01); G02F 1/01 (2006.01); G02F 1/225 (2006.01); G02B 6/12 (2006.01)
CPC G02B 6/29338 (2013.01) [G02B 6/29352 (2013.01); G02B 6/29395 (2013.01); G02F 1/0147 (2013.01); G02F 1/225 (2013.01); G02B 6/12007 (2013.01); G02F 2203/56 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A resonant interferometric coupler comprising:
a substrate;
a bus waveguide mounted to the substrate, the bus waveguide having in serial connection an input section, a bent section and an output section;
a first resonator mounted to the substrate and having a first evanescent coupling point with the input section and a second evanescent coupling point with the output section, the first resonator having first resonances;
an interferometer having a first arm path extending along the bent section between the first and second evanescent coupling points, and a second arm path extending along the first resonator between the first and second evanescent coupling points; and
a second resonator being mounted to the substrate and having a third evanescent coupling point with the bent section, the second resonator having at least a second resonance overlapping with at least one of the first resonances and across which a first phase shift is imparted, the first phase shift causing interference at the second evanescent coupling point.