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Journals and Conferences
An acoustooptic tunable filter (AOTF) is employed in an optical system to obtain an independently tunable and reconfigurable radio-frequency transversal filter. Manipulating only the control signals of the AOTF modifies the transfer function of the filter. This letter demonstrates the experimental implementation of a two-tap version of the proposed filter.… (More)
In this paper, a wide-band photonically phased array antenna is demonstrated. The array configuration consists of a 4 /spl times/ 1 Vivaldi single-polarization antenna array and an independent photonic phasing system for each element. The phasing network of this array is implemented using two novel photonic phase shifters based on the vector summation… (More)
A novel photonically implemented RF band-pass filter, using a comb-laser and a fiber dispersive medium is presented. Positive and negative taps are achieved by driving two Mach-Zehnder modulators with opposing quadrature biases.
Characterization of overall genetic diversity is an important foundation in breeding for superior genotypes. For sesame (Sesamum indicum L.), an important oil seed crop, little is still known about genetic variability in many possible diversity hotspots, one of them postulated to be in Central Asia. We studied 27 sesame accessions, including 13 Iranian… (More)
Introduction: Optically realised microwave filters offer advantages such as large operating bandwidth and immunity to microwave interference. Several researchers have investigated microwave photonic filters to enable tunable and reconfigurable systems. Capmany et al.  proposed a filter system that employs an array of tunable lasers. The filter can be… (More)
A novel technique to phase shift signal by 90 degrees over a broad frequency range based on transversal signal processing is proposed and practically demonstrated. The proposed technique is suitable for non coherent optic implementation.
In this paper, a wideband photonic phased array antenna is demonstrated. The array configuration consists of a 4x1 Vivaldi single-polarization antenna array and an independent photonic phasing system for each element. The phasing network of this array is implemented using two novel photonic phase shifters based on the vector summation approach. A vector sum… (More)
A novel and compact scheme to assign coefficient to a wavelength channel is presented. This scheme realises both positive and negative coefficients over the full range from -1 to 1. A proof of concept is demonstrated for RF frequencies ranging from 1 to 20 GHz. This scheme allows implementation of transversal filters with arbitrary responses.