US 11,709,320 B2
Mode converter for optical fiber-to-thin film lithium niobate coupling
Edward Wooten, San Jose, CA (US)
Assigned to Photonic Systems. Inc., Billerica, MA (US)
Filed by Photonic Systems, Inc., Billerica, MA (US)
Filed on Feb. 1, 2022, as Appl. No. 17/590,196.
Claims priority of provisional application 63/144,629, filed on Feb. 2, 2021.
Prior Publication US 2022/0252791 A1, Aug. 11, 2022
Int. Cl. G02B 6/30 (2006.01); G02B 6/122 (2006.01); G02B 6/14 (2006.01); G02B 6/12 (2006.01)
CPC G02B 6/305 (2013.01) [G02B 6/12004 (2013.01); G02B 6/1228 (2013.01); G02B 6/14 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical mode converter comprising:
a) a silicon substrate;
b) a silicon dioxide film deposited on a top surface of the silicon substrate;
c) a lithium niobate waveguide positioned on the silicon dioxide film having a slab and a rib that both taper in a direction of beam propagation through the optical mode converter; and
d) a doped silicon dioxide waveguide positioned on top of the lithium niobate waveguide and having a slab that tapers in the direction of the optical beam propagation through the optical mode converter,
wherein the optical mode converter expands an optical mode of the optical beam propagating through the optical mode converter from a first optical mode size to a second optical mode size.