B. Ortega

Wavelength conversion of SCM signals using semiconductor optical amplifiers: theory, experiments, and applications

In this paper, we deal with the subject of cross-gain modulation (XGM) and cross-phase modulation (XPM) semiconductor optical amplifier-based wavelength conversion of optical channels carrying subcarrier multiplexing signals in a comprehensive way. The equations and models that describe the conversion process and the resulting harmonic and intermodulation distortions are obtained showing the superior performance of XPM over XGM in terms of secondand third-order distortion and contrast ratio. Experimental results for XGM-based wavelength conversion that confirm the results predicted by our theoretical models are presented, and finally, we consider the specific application of wavelength conversion of optical channels carrying full frequency plans such as that of cable television applications.

Microwave signal processing using optics

We cover the fundamental concepts and applications of photonic filters for Rf, microwave and millimetre signal processing, addressing their two main fields of application: A)Filters for RF systems and applications and B) Filters for Optical Transmission systems and networks

Experimental demonstration of the continuous tuning of microwave photonic filters by sinusoidal modulation of the filter coefficients

We show the results of a technique to tune continuously the resonances of the microwave photonic filters are shifted by changing the weight of the optical taps. It improves the performance of the cited filters.

Microwave phase shifter based on a fibre Bragg grating operating at constant wavelength

We present a variable delay line for phased-array antennas based on a fiber Bragg grating of uniform period operating at constant optical wavelength. Time-delay variations of 330 ps in the frequency range 1 GHz to 14 GHz are demonstrated.