Pirelli Cavi E Sistemi S.p.a.

Avanex Corporation

Jma Wireless B.v.

John Mezzalingua Associates Holdings B.v.

Massimo Notargiacomo

Giuseppe Ravasio

Claudio Zammarchi

Franco Mussino

Gianluca Gobetti

Paolo Brambilla

A system for the distribution of radio-frequency signals includes a main unit associated with a first radio communication set, a remote unit associated with a second radio communication set installed in a preset area, for radio coverage of the area, and a communication channel associated with the main and remote units, wherein the main unit and remote units have analogue modulation elements of signals to be sent on the communication channel. The remote unit includes a selective amplification unit associated with the second radio communication set and having analogue/digital conversion elements of signals coming from the main unit, through the communication channel, and/or of signals coming from the second radio communication set, digital filtering elements of digital signals coming out of the analogue/digital conversion elements and amplification elements of signals coming from the main unit, through the communication channel, and/or of signals coming from the second radio communication set.

Distributed antenna system and method

A system for the distribution of radio-frequency signals includes a main unit associated with at least a first radio communication set, at least a remote unit associated with at least a second radio communication set installed in a preset area, for the radio coverage of the area, and a communication channel associated with the main unit and with the remote unit, wherein the main unit () and the remote unit have analogue modulation elements of the signals to be sent on the communication channel. The remote unit includes at least a selective amplification unit associated with the second radio communication set and having analogue/digital conversion elements of the signals coming from the main unit, through the communication channel, and/or of the signals coming from the second radio communication set, digital filtering elements of the digital signals coming out of the analogue/digital conversion elements and amplification elements of the signals coming from the main unit, through the communication channel, and/or of the signals coming from the second radio communication set.

System and method for the distribution of radio-frequency signals

Electro-optical modulator (), comprising at least one electrical port () and an input circuit () for the application of a modulating electrical signal to the said at least one electrical port. The said modulator also comprises a linear processing circuit () capable of generating a compensation signal. This linear processing circuit comprises a first terminal connected to the input circuit for taking a fraction of the said modulating electrical signal, at least one filtering element () for eliminating predetermined spectral components from the said fraction of the modulating electrical signal, and at least one phase-shifting element () for inverting the phase of the said fraction of the modulating electrical signal. The said linear processing circuit also comprises a second terminal capable of being connected to the said at least one electrical port for applying the compensation signal to the said electro-optical modulator.

Method of analog modulation and optical emitter using this method

Biasing system for an optical modulator with double output

The present invention relates to a method and to a signal predistorter circuit for eliminiating the nonlinearities in the input/output characteristics of nonlinear stages, in particular for eliminating the third-order nonlinearities. More particularly, it relates to a method and to a predistorter circuit for external optical modulators of television signals. The method for predistortion of a signal of variable amplitude comprises the phases of: delivering the said signal to at least one first distorter circuit; biasing the said at least one first distorter circuit; distorting the said signal in the said at least one first distorter circuit; characterized in that the said phase of biasing the said at least one first distorter circuit comprises the phase of maintaining a substantially constant preset voltage value on varying the amplitude of the said signal at the said at least one first distorter circuit.

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S. Agata sul Santerno, Italy

Massimo Notargiacomo