Abstract: Disclosed is a method for reducing the Kerr effect in an interferometry measuring device including a generator configured to emit an input periodic light signal, and a Sagnac interferometer in which two counterpropagating signals travel and combine so as to form a periodic output signal having at least two power values, the method including: determining a phase shift between the two counterpropagating signals a first time, and cancelling out the phase shift; and then determining a phase shift between the two counterpropagating signals a second time; and adjusting the ratio between the average powers of the counterpropagating signals so as to cancel out the value of the phase shift determined in the second determination. Also disclosed is an interferometry measuring device configured to implement such method.

Abstract: Disclosed is a Sagnac interferometer with a looped or an in-line optical fiber. The interferometer includes an hybrid integrated optical circuit having at least a first, electro-optic, substrate and a second, transparent, substrate with a common interface, the first substrate including a first optical waveguide, a second optical waveguide, the first optical waveguide and the second optical waveguide being connected to at least one end of the fiber-optic coil, and an input-output optical waveguide connected to a light source and to a detection system, the second substrate including at least one U-shaped optical waveguide and the hybrid integrated optical circuit including a planar waveguide Y-junction with a common branch and two secondary branches.

Abstract: Disclosed is a Sagnac interferometer with a looped or an in-line optical fiber. The interferometer includes an hybrid integrated optical circuit having at least a first, electro-optic, substrate and a second, transparent, substrate with a common interface, the first substrate including a first optical waveguide, a second optical waveguide, the first optical waveguide and the second optical waveguide being connected to at least one end of the fiber-optic coil, and an input-output optical waveguide connected to a light source and to a detection system, the second substrate including at least one U-shaped optical waveguide and the hybrid integrated optical circuit including a planar waveguide Y-junction with a common branch and two secondary branches.

Abstract: An optical integrated circuit with waveguide separation on a substrate includes at least one separating unit, including an optical input/output interface in relation with an external light wave guide, the interface extending in the circuit through an optical guiding input section extended by at least two optical guiding branches mutually spaced apart substantially symmetrically relative to the general direction of the input section. The input section includes as many optical guides as branches, adjacent input section optical guides being substantially rectilinear and mutually parallel, two adjacent optical guides of the input section being separated by an aperture of width D, the refractive index of the opening being lower than that of the optical guides, each input section optical guide having a determined width We1, each branch optical guide exhibiting a width increasing in the direction away from the input section from the width We1 up to a determined width Ws.

Abstract: An optical integrated circuit with waveguide separation on a substrate includes at least one separating unit, including an optical input/output interface in relation with an external light wave guide, the interface extending in the circuit through an optical guiding input section extended by at least two optical guiding branches mutually spaced apart substantially symmetrically relative to the general direction of the input section. The input section includes as many optical guides as branches, adjacent input section optical guides being substantially rectilinear and mutually parallel, two adjacent optical guides of the input section being separated by an aperture of width D, the refractive index of the opening being lower than that of the optical guides, each input section optical guide having a determined width We1, each branch optical guide exhibiting a width increasing in the direction away from the input section from the width We1 up to a determined width Ws.

Abstract: An electric-optic modulator includes a block of crystal having electro-optic properties, the block extending lengthways along a long axis and having a light guide which extends between a light guide input and a light guide output. An electric modulation signal acts on an interaction zone of the block via coplanar electrodes together with the light guide via a dielectric layer. The electrodes are disposed on a main long face of the block and the interaction zone is elongated more or less along the long axis. The light to be modulated arrives through an input optical fiber which is connected to the light guide at the light guide input on a first face of the block. The modulated light leaves the modulator through an output optical fiber connected to the light guide output on a second face of the block. The first face and the second face are one single face (D) which is parallel to the long axis.

Abstract: An optical modulator includes a waveguide structure forming a two-wave interferometer made of an electro-optical material, and two arms, a set of electrodes connected to a controllable electric source for applying an electric field on at least one of the arms of the interferometer, so as to vary the phase difference between light waves along one or the other of the two arms. The modulator includes two sets of electrodes placed respectively on each of the interferometer arms, one in the non-reversed region of the electro-optical material, the other in the reversed region, and a delay line placed between the control electronics of the electrode sets introducing a delay equal to the light propagation time in the first electrode set.

Abstract: The invention relates to an electric-optic modulator comprising a block (1) of crystal having electro-optic properties, said block extending lengthways along a long axis and comprising a light guide (4) which extends between a light guide input and a light guide output. An electric modulation signal acts on an interaction zone of the block by means of coplanar electrodes (5) together with the light guide through the intermediary of a dielectric layer. Said electrodes are disposed on a main long face of the block and the interaction zone is elongated more or less along the long axis. The light to be modulated arrives through an input optical fiber (2′) which is connected to the light guide at the light guide input on a first face of the block. The modulated light leaves the modulator through an output optical fiber (2″) which is connected to the light guide at the light guide output on a second face of the block.

Abstract: An optical modulator includes a waveguide structure forming a two-wave interferometer made of an electro-optical material, and two arms, a set of electrodes connected to a controllable electric source for applying an electric field on at least one of the arms of the interferometer, so as to vary the phase difference between light waves along one or the other of the two arms. The modulator includes two sets of electrodes placed respectively on each of the interferometer arms, one in the non-reversed region of the electro-optical material, the other in the reversed region, and a delay line placed between the control electronics of the electrode sets introducing a delay equal to the light propagation time in the first electrode set.