Abstract: The invention relates to a polarization-insensitive optical filter centered on a wavelength measured in vacuum, comprising: first and second waveguides each having a propagation mode; a first grating formed in or on the surface of the first waveguide, the first grating being periodical at least along a first axis Ox defining a first orthonormal base Oxyz; a second grating formed in or on the surface of the second waveguide, the second grating being periodical at least along a second axis Ox? defining a second orthonormal base Ox?y?z; wherein the first and second grating are provided one above another and are such that the first axis Ox and the second axis Ox? define an angle ? different from ±?/2 radians so that, when the first grating is illuminated by a light beam, the propagation modes are excited and have orthogonal fields for an angle of incidence of the light beam.

Abstract: The invention relates to a polarization-insensitive optical filter centered on a wavelength (?0) measured in vacuum, comprising: first and second waveguides each having a propagation mode; a first grating formed in or on the surface of the first waveguide, the first grating being periodical at least along a first axis Ox defining a first orthonormal base Oxyz; a second grating formed in or on the surface of the second waveguide, the second grating being periodical at least along a second axis Oxy? defining a second orthonormal base Ox?y?z; wherein the first and second grating are provided above each other and are such that the first axis Ox and the second axis Ox? define an angle ? different from ±?/2 radians so that, when the first grating is illuminated by a light beam, the first and second propagation modes are excited and have orthogonal fields for a predetermined angle of incidence of the light beam.

Abstract: The invention relates to a device (10,20) for detecting a phase difference between two light beams (8A, 8B), said device including: a diffraction grating (2) which can generate an interference field between the two light beams; and a photodiode (1,5) which is arranged to receive the interference field, said diffraction grating being integrated to the photodiode. The invention is characterized in that the diffraction grating is an amplitude grating (2).

Abstract: The invention relates to a device (10, 20) for detecting a phase difference between two light beams (8A, 8B), said device including: a diffraction grating (2) which can generate an interference field between the two light beams; and a photodiode (1,5) which is arranged to receive the interference field, said diffraction grating being integrated into the photodiode. The invention is characterized in that the diffraction grating is an amplitude grating (2).