Waveguide, manufacturing method of said waveguide and polarisation splitter which makes use of said waveguide

-8. (canceled)

-14. (canceled)

A polarisation splitter (200), comprising a first waveguide (210) and a second waveguide (220) adjacently arranged at a distance (d);

• wherein the second waveguide (220) comprises a plurality of sections of a core material (110) and a plurality of sections of a covering material (120) alternately arranged in a periodic way with a period (Λ) smaller than the wavelength (λ) of a light guided through the waveguide (100);
• and
• wherein the second waveguide (220) is single mode and comprises interfaces respectively defined between each one of the sections of the plurality of sections of core material (110) and each one of the sections of the plurality of sections of covering material (120) forming an angle (α) greater than zero with respect to a plane perpendicular to a propagation direction of the light intended to be guided by the waveguide (100), and wherein the plurality of sections of core material (110) and the plurality of sections of covering material (120) have constant geometric properties throughout the length of the waveguide (100).

-24. (canceled)

A waveguide (100) comprising a plurality of sections of a core material (110) and a plurality of sections of a covering material (120) alternately arranged in a periodic way with a period (Λ) smaller than the wavelength (λ) of a light guided through the waveguide (100);

• wherein the waveguide (100) is single mode and comprises interfaces respectively defined between each one of the sections of the plurality of sections of core material (110) and each one of the sections of the plurality of sections of covering material (120) forming an angle (α) greater than zero with respect to a plane perpendicular to a propagation direction of the light intended to be guided by the waveguide (100);
• wherein the waveguide (100) further comprises at least one modal adapter (140) connected to an input of the waveguide (100), said at least one modal adapter (140) comprising a plurality of sections of core material (110) and sections of covering material (120) arranged in an alternated and periodic way with a period (Λ) smaller than the wavelength (λ) of a light guided through the at least one modal adapter (140), and the plurality of sections of core material (110) being arranged with progressive angles between a plane perpendicular to the propagation direction of the guided light and the angle (α).