Pirelli Cavi E Sistemi S.p.a.

Avanex Corporation

Pirelli Cavi S.p.a.

Sergio Bosso

Emilio Casaccia

Steffen Schmid

Aldo Perasso

Davide Frassati

Giovanni Ghione

Marco Pirola

Salvatore Morasca

Flavio Fontana

Andrea Castoldi

Gianluca Gobetti

Harald Herrmann

A resonant optical modulator includes an electro-optical substrate, an optical waveguide formed in the substrate and having a variable index of refraction, and an active modulator electrode formed on the substrate in relation to the waveguide to effect electro-optical variation of the index of refraction upon application to the electrode of a modulating signal. An interface port formed on the substrate provides the modulating signal to the electrode from a signal source and has an impedance. An electrical structure, formed on the substrate and coupled to the interface port and the electrode, makes an impedance of the optical modulator substantially equal to the impedance of the signal source. The electrical structure includes a delay line and a stub formed on the substrate.

Electro-optic modulators with internal impedance matching

The invention relates to optical birefringent waveguides, acousto-optical devices using such optical waveguides and an acoustic waveguide as well as a manufacturing method therefore. The optical waveguides of the invention exhibit a small birefringent variation with respect to a change of waveguide parameters, if the fundamental mode propagating in the optical waveguide has a propagation constant near to the cut-off condition. The optical waveguide dimensions are typically chosen such that the cut-off wavelength of the waveguide is below 1650 nm for an operating wavelength in the window between 1530 nm and 1656 nm. The acousto-optic mode converter using such optical waveguides have a superior conversion characteristic over the conversion frequency with reduced side lobes. Therefore, using the thin and narrow optical waveguides of the invention, a superior performance of the acousto-optical devices using such an optical waveguide can be obtained.

Waveguide structures in particular for use in acousto-optical mode converters and method for making same

An optical modulator includes an optical waveguide and an electrode structure coupled to the waveguide such that a modulating signal applied to the electrode structure varies the refractive index of the waveguide so as to produce a modulated optical output signal. The electrode is fabricated in the form of a transmission line terminated in a short circuit. The ratio of the wavelength of the modulating signal to the effective length of the electrode is comprised between 2.1 and 4.0, and is preferably of approximately 2.7. The modulator can be constructed to provide either phase or amplitude modulation. An optical transmission method having SBS suppression and an optical modulator system are further provided.

Narrow-band optical modulator with reduced power requirement

Method for manufacturing electrooptical components comprising an optical structure and an electrical structure on a device, comprising forming at least two optical waveguide structures on a substrate, forming an electrical structure for each optical structure on said substrate, each comprising at least one ground electrode and one signal electrode, respectively associated with said optical waveguide structures, analyzing in succession the optical characteristics of the electrooptical structures constituted by the joining together of said optical structures and said electrical structures formed in accordance with the preceding steps, and choosing one of said electrooptical structures demonstrating, upon said analysis, improved values compared to a predetermined limit; the present invention also relates to electrooptical components comprising independent and symmetrical electrooptical structures.

Method for reducing rejects in the manufacture of integrated optical

An acoustooptical wavelength device for wavelength selection includes one substrate of a birefringent and photoelastic material on which there is formed: first and second rotation stages of the polarization plane of an optical signal in a first wavelength interval, wherein each stage comprises at least one optical waveguide traveled over by the signal; at least one optical waveguide, connecting the two stages and carrying one single polarizer consisting of an evanescent-wave polarization coupler; and at least one optical waveguide carrying one polarizer being finally provided downstream of the second stage.

Acoustooptical waveguide device for wavelength selection and process for

Active-mode-locking optical-fiber laser generator

Growing community of inventors

Buccinasco, Italy

Sergio Bosso