US 12,442,981 B2
Double-layered antisymmetric two mode Bragg gratings
Tao Ling, Breinigsville, PA (US); Ravi S. Tummidi, Breinigsville, PA (US); and Shiyi Chen, Breinigsville, PA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Feb. 13, 2023, as Appl. No. 18/168,366.
Prior Publication US 2024/0272363 A1, Aug. 15, 2024
Int. Cl. G02B 6/293 (2006.01); G02B 6/12 (2006.01); G02B 6/124 (2006.01)
CPC G02B 6/29328 (2013.01) [G02B 6/124 (2013.01); G02B 6/29389 (2013.01); G02B 6/12007 (2013.01); G02B 2006/12107 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Bragg grating, comprising:
a first layer comprising a first anti-symmetrical structure in a first plane parallel with a top plane with a first pitch, wherein the first layer further comprises an input configured to receive an optical signal at a first end of the Bragg grating; and
a second layer comprising a second anti-symmetrical structure in a second plane parallel with the top plane with a second pitch that is different than the first pitch, wherein the first layer is disposed between the second layer and the top plane, wherein the second layer further comprises:
a first mode transition disposed in the second layer at the first end of the second layer; and
a second mode transition disposed in the second layer at a second end of the second layer opposite the first end of the second layer.