Murphy, Bilak & Homiller, PLLC
Silicon photonic device, optical polarisation beam coupler and optical waveguide coupler
A silicon photonic device (1) comprising: a silicon core (2) having a core refractive index; and a structure formed in the silicon core, comprising: a first refractive index variation pattern (4) across the core in a first direction (x) and having a first modulation depth (Hi); and a second refractive index variation pattern (6) across the core in a second, orthogonal, direction (y) and having a second modulation depth (H2), less than the first modulation depth. The first refractive index variation pattern overlays the second refractive index variation pattern, forming a three-dimensional structure. The first refractive index variation pattern only supports propagation of light having a TM mode between the first direction and a third direction (z) and the second refractive index variation pattern only supports propagation of light having a TE mode between the second direction and the third direction. An optical waveguide coupler is also disclosed. The optical waveguide coupler comprises a plurality of planar waveguides, each supporting propagation of one of a TE and a TM mode, and a plurality of silicon diffractive gratings each comprising a planar silicon core and a grating structure formed by a periodic refractive index variation extending across the core in a first direction and having a grating period and a modulation depth, these selected to cause the grating to support propagation of the light between the first direction and a third direction substantially orthogonal to the planar silicon core. Additionally the optical waveguide coupler comprises a plurality of tapered planar waveguides.
Telefonaktiebolaget LM Ericsson (publ)
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Wei-Ping Stephane Francesco Mats
Huang Lessard Testa Johansson