Virginie Coda

Planar achromatic multiple beam splitter by adiabatic light transfer

We introduce a novel achromatic and robust scheme for n-fold multiple beam splitting based on adiabatic light transfer in a planar geometry of coupled waveguides (WGs). The concept is experimentally verified for a one-to-three beam splitter by using a reconfigurable light-induced WG structure at two operating wavelengths. The demonstrated planar-type achromatic beam splitter opens new opportunities for the realization of ultra-high bandwidth on-chip photonic devices.

Low drive voltage electro-optic Bragg deflector using a periodically poled lithium niobate planar waveguide

An electro-optic Bragg light deflector is demonstrated in a thinned, periodically poled lithium niobate planar waveguide confined between two silica layers on a silicon substrate. More than 97% of diffraction efficiency is obtained with an operating wavelength of 633 nm for the two orthogonal light polarizations with a drive voltage of about 5 V. The temporal electric drift and the response time of the component are also studied.

Integrated low drive voltage electro-optic Bragg modulator using a periodically poled lithium niobate

Periodically poled lithium niobate (PPLN) is currently used for frequency conversions using quasi-phase-matching, thanks to its high nonlinear coefficients and mature poling process. PPLN can also be attractive for electro-optic (EO) applications. Several studies have been conducted on PPLN-based EO deflectors, and recent realizations have lower the required applied voltage under hundred volts [1]. Indeed, for practical EO applications drive voltages as low as 5 V are usually required. For this purpose, we use a recent technique to realize high-quality isolated crystalline film out of LN [2] to implement an EO Bragg deflector with a drive voltage below 10 V. In this work we present an efficient spatial light deflector working for extraordinary or ordinary light polarization using the EO effect in a thinned PPLN planar waveguide confined between two silica layers on a silicon substrate, which allows the deflection of the light under the effect of a low electrical voltage.

Quantum-like adiabatic light transfer in photo-induced waveguides with longitudinally varying detuning

Besides longitudinally varying coupling constants, the longitudinal variation of the propagation constants leads to an additional parameter for the control of adiabatic light transfer in coupled waveguide systems. Examples are given using waveguides structures recorded with the help of the photorefractive e↵ect and mimicking the quantum processes of Rapid Adiabatic Passage (RAP) and two-state STImulated Raman Adiabatic Passage (two-state STIRAP).

Coupling length phase matching in parallel waveguides

We show that phase-matching for frequency conversion is possible in a system consisting of two parallel waveguides without any spatial modulation of linear or nonlinear optical properties, both for second and for third-order effects

Coupling length phase matching for third-order frequency downconversion in dual core fibers

The coupling between parallel waveguides leads to a quasi-phase matching effect that allows to obtain phase matching for third-order down conversion and other third-order processes in silica fibers. Several phase matching conditions are found

Demonstration of reconfigurable optical functions inspired by quantum effects

The formal analogy between light propagation in an array of coupled optical waveguide (WG) and quantum effects has inspired a number of recent studies [1-3] of fundamental interest or for potential applications in integrated optics. With such analogies light intensities in the waveguides mimic the populations of discrete energy levels in quantum systems.

All optical analogue to Electromagnetically Induced Transparency and Autler-Townes effect

We investigate theoretically and demonstrate experimentally using reconfigurable structures that light propagation in a system of three coupled waveguides can behave in full analogy to Electromagnetically Induced Transparency and Autler-Townes effect.

Planar n-fold beam splitter based on adiabatic light transfer

We demonstrate the adiabatic light transfer from an input waveguide into equal intensity output channels. This concept is using reconfigurable light-induced planar waveguide structure composed of input and buffer waveguides coupled to a waveguide array.

Complex waveguide trajectories induced by photorefractive solitons in LiNbO3: a step toward 3-D optical circuitry

We report on the realization of optical integrated circuits in 3-D using circular bright photorefractive spatial solitons in photonic-grade lithium niobate. Fabrication of curved waveguides, zero-radius-bend waveguides and 1-by-4 crossconnect is described.