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Vito Sorianello

Marco Romagnoli

Fabio Cavaliere

Francesco Testa

Antonella Bogoni

Antonio D'Errico

Marzio Puleri

Alberto Bianchi

Paolo Ghelfi

Gianluca Meloni

Claudio Porzi

Francesco Fresi

Giovanni Serafino

Michele Midrio

Philippe Velha

A transmitter () is configured to transmit an optical signal, the transmitter comprising an optical dispersion compensator () configured to compensate for chromatic dispersion of the optical signal. The optical dispersion compensator comprises a plurality of delay elements (). The plurality of delay elements () have a combined response providing a delay to the transmitted optical signal which varies with frequency.

Chromatic dispersion compensation

A device () is configured to receive an optical signal. The device comprises a dispersion compensator () comprising a plurality of optical dispersion compensator units (). Each optical dispersion compensator unit comprises a plurality of delay elements (). The dispersion compensator () is configured to selectively activate one or more of the optical dispersion compensator units (). The dispersion compensator () is configured to compensate for dispersion of the optical signal with the activated one or more optical dispersion compensator unit ().

A method for dual polarisation optical transmission is disclosed. The method comprises splitting a continuous wave light source into first and second sub-channels, optically modulating each sub-channel with a data signal, and superimposing a first pilot tone onto the first optically modulated sub-channel and a second pilot tone, different from the first pilot tone, onto the second optically modulated sub-channel. The method further comprises polarisation multiplexing the first and second sub-channels to form a polarisation multiplexed signal, in which the first and second sub-channels have orthogonal states of polarisation, and transmitting the polarisation multiplexed signal.

Methods and apparatus for dual polarisation optical communication

An opto-electronic oscillator () comprising: an optical source () to generate an optical carrier signal having a carrier wavelength; an optical phase modulator () to apply a sinusoidal phase modulation to the optical carrier signal to generate two first order sidebands having a &#x3c0; phase difference between them; an optical phase shifter () comprising an optical resonator configured to apply a substantially &#x3c0; phase-shift to one of the first order sidebands at a preselected wavelength within an optical spectrum of said first order sideband; and a photodetector () configured to perform optical heterodyne detection of the optical carrier signal with both: said one of the first order sidebands substantially it phase shifted by the optical resonator; and the other of the first order sidebands, to generate an electrical carrier signal (), and wherein a first part of the electrical carrier signal () is delivered to an electrical output () and a second part of the electrical carrier signal () is delivered to the optical phase modulator as a drive signal.

Opto-electronic oscillator and method of generating an electrical carrier signal

There is provided an optical switch. The optical switch comprises a first optical waveguide, a second optical waveguide, a first optical ring resonator and a second optical ring resonator. The first optical ring resonator is arranged between the first optical waveguide and the second optical waveguide, wherein the first optical ring resonator is capable of coupling an optical signal travelling along the first optical waveguide in a first direction to the second optical waveguide such that the optical signal travels in a second direction along the second optical waveguide. The second optical ring resonator is arranged between the first optical waveguide and the second optical waveguide; wherein the second optical ring resonator is capable of coupling an optical signal travelling along the first optical waveguide in the first direction to the second optical waveguide such that the optical signal travels in a third direction along the second optical waveguide opposite to the second direction. There is also provided an optical network node and an optical network.

Optical switch, an optical network node and an optical network

A device () for processing a signal, the device comprising a polarization module () configured to receive a multi-wavelength optical input signal (Si) comprising a plurality of wavelengths, and for each wavelength. The polarization module is configured to convert a component of each wavelength having a first polarization mode into a converted component having a second, different, polarization mode. The device further comprises a processing module () configured to combine the converted component of each wavelength with a direct component of each wavelength received with said second polarization mode. The processing module is configured to generate a multi-wavelength optical output signal (So) solely having said second polarization mode.

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Pisa, Italy

Vito Sorianello