Graphene-based lithium niobate film broadband mode filter
A graphene and filter technology, applied in the direction of optical waveguide and light guide, can solve the problems of optical waveguide mode crosstalk, etc., and achieve the effect of broadband filter mode extinction ratio, compact structure, and high mode extinction ratio
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Embodiment 1
[0032] A graphene-based lithium niobate thin film broadband mode filter, including silicon substrate layer, silicon dioxide layer, lithium niobate thin film, graphene and polymethyl methacrylate waveguide arranged in sequence from bottom to top; Graphene is arranged at the center of the polymethyl methacrylate waveguide as a fundamental mode filter.
[0033] In the fundamental mode filter, the thickness of the silicon substrate layer is 0.5nm, the thickness of the silicon dioxide layer is 2μm, the thickness of the lithium niobate film is 300nm, the tangential direction of the lithium niobate film crystal is X-cut, the thickness of the graphene is 0.34nm, and the width of the graphene is 300nm, the thickness of the PMMA waveguide is 500nm, and the width is 2μm.
[0034] Take 1550nm optical transmission as an example: the light source is a tunable fiber laser with a wavelength of 1550nm. The output fiber of the laser passes through a polarization controller and is connected to t...
Embodiment 2
[0036] A graphene-based lithium niobate thin film broadband mode filter, including silicon substrate layer, silicon dioxide layer, lithium niobate thin film, graphene and polymethyl methacrylate waveguide arranged in sequence from bottom to top; Graphene is arranged at the center of the polymethyl methacrylate waveguide as a fundamental mode filter.
[0037] In the fundamental mode filter, the thickness of the silicon substrate layer is 0.5nm, the thickness of the silicon dioxide layer is 2μm, the thickness of the lithium niobate film is 300nm, the tangential direction of the lithium niobate film crystal is X-cut, the thickness of the graphene is 0.34nm, and the width of the graphene is 500nm, the thickness of the PMMA waveguide is 500nm, and the width is 2.5μm.
[0038] Take 1550nm optical transmission as an example: the light source is a tunable fiber laser with a wavelength of 1550nm. The output fiber of the laser passes through a polarization controller and is connected to...
Embodiment 3
[0040]A graphene-based lithium niobate thin film broadband mode filter, including silicon substrate layer, silicon dioxide layer, lithium niobate thin film, graphene and polymethyl methacrylate waveguide arranged in sequence from bottom to top; Graphene is arranged at the center of the polymethyl methacrylate waveguide as a fundamental mode filter.
[0041] In the fundamental mode filter, the thickness of the silicon substrate layer is 0.5nm, the thickness of the silicon dioxide layer is 2μm, the thickness of the lithium niobate film is 300nm, the tangential direction of the lithium niobate film crystal is X-cut, the thickness of the graphene is 0.34nm, and the width of the graphene is 600nm, the thickness of the PMMA waveguide is 500nm, and the width is 3μm.
[0042] Take 1550nm optical transmission as an example: the light source is a tunable fiber laser with a wavelength of 1550nm. The output fiber of the laser passes through a polarization controller and is connected to th...
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