Ixblue

Stephane Chouvin

Cedric Molucon

Pascal Simonpietri

Herve Lefevre

Frederic Guattari

Disclosed is an optical fiber interferometric system including a light source (), a fiber optic coil (), a coil splitter (), a photodetector (), and a polarization filtering unit. According to an embodiment, the polarization filtering unit includes a first waveguide polarizer (), at least one second thin-plate polarizer () and an optical waveguide section (), the at least one second polarizer () being disposed in the Rayleigh zone between a first waveguide end () of the first polarizer () and a second waveguide end () of the optical waveguide section ().

Sagnac-ring fiber-optic interferometric system with Rayleigh length spaced polarizer

Interferometric measurement device includes a light source emitting a source signal and optical coupling elements receiving the source signal, directing part of the latter towards a measurement pathway including a Sagnac ring interferometer, of frequency f, producing a power output signal Ppolarized according to a first polarization direction, tapping off another part of the source signal towards a compensation pathway producing a return power compensation signal P, and directing the output and compensation signals towards detection elements. The compensation pathway includes polarization rotation elements producing the compensation signal according to a second cross-direction of polarization, and optical looping elements redirecting part of the compensation signal towards the measurement pathway; the detection elements include a single detector connected to the coupling elements for receiving the output signal and the compensation signal; the device further includes power equilibration elements equalizing the output power and/or return power are routed towards the detector.

Interferometric measurement device

Disclosed is a waveguide polarizing optical device, including a first waveguide polarizer (), a section of a second optical waveguide () and a second thin-plate polarizer () having a physical thickness T and a refractive index n, the second thin-plate polarizer () being disposed on the optical path between a waveguide end () of the first polarizer () and one end () of the second optical waveguide (), the physical distance d between the waveguide end () of the first polarizer () and the end () of the second optical waveguide () being less than or equal to twice the Rayleigh length and the physical thickness T of the second polarizer () being less than or equal to the physical distance d.

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Bagneux, France

Stephane Chouvin