US 12,189,268 B2
Display system with tunable wavelength conversion in a nanophotonic periodically poled lithium niobate waveguide
Gareth John Valentine, Kirkland, WA (US); Zhimin Shi, Bellevue, WA (US); and Xi Wu, Redmond, WA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Jun. 10, 2022, as Appl. No. 17/837,751.
Prior Publication US 2023/0400748 A1, Dec. 14, 2023
Int. Cl. G02F 1/35 (2006.01); G02B 6/12 (2006.01); G02B 27/01 (2006.01); G02F 1/39 (2006.01); B82Y 20/00 (2011.01); G02F 1/355 (2006.01)
CPC G02F 1/3546 (2021.01) [G02B 6/12009 (2013.01); G02B 27/0172 (2013.01); G02F 1/395 (2013.01); B82Y 20/00 (2013.01); G02B 2006/1204 (2013.01); G02B 2207/101 (2013.01); G02F 1/3558 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wavelength tunable light source, comprising:
a first layer comprising a substrate material;
a second layer provided on the first layer, the second layer comprising a cladding layer;
a third layer provided on the second layer, the third layer comprising lithium niobate (LN), wherein a portion of the third layer forms a protrusion along one dimension of the third layer, and wherein the protrusion is a periodically poled lithium niobate (PPLN) waveguide;
a fourth layer provided on the third layer, the fourth layer comprising silicon dioxide (SiO2) and covering at least partially the third layer and the PPLN waveguide; and
at least one microheater provided on the fourth layer to:
generate heat in response to an applied current to cause a change in a refractive index of the PPLN waveguide via the generated heat; and
adjust an output wavelength of the PPLN waveguide in response to a varied input signal wavelength through the change in the refractive index of the PPLN waveguide.