Showing papers by "Robert A. Minasian published in 2009"
TL;DR: In this paper, a microwave photonic filter that solves the problem of realising a single bandpass RF response is presented, based on using phase modulation together with a pair of gratings, and eliminates the baseband response and periodic spectral response of typical FIR filters.
Abstract: A new microwave photonic filter that solves the problem of realising a single bandpass RF response is presented. The filter is based on using phase modulation together with a pair of gratings, and eliminates the baseband response and periodic spectral response of typical FIR filters. Experimental results demonstrate a single passband square-type bandpass filter response, and operation to high frequencies.
79 citations
Proceedings Article•
01 Dec 2009TL;DR: In this paper, a high-order, high-Q microwave photonic filter structure is presented, which achieves the highest number of taps for a microwave FIR filter reported to date.
Abstract: A new high-order, high-Q microwave photonic filter structure, is presented. Experimental results demonstrate a filter response with 158 taps, which is the highest number of taps for a microwave photonic FIR filter reported to date.
14 citations
TL;DR: In this article, a spectrum-sliced microwave photonic filter exhibiting multitap characteristics, high-frequency operation, and insensitivity to the operating optical wavelength is presented, based on an amplitude-modulated single sliced source and a novel sinusoidal group delay line structure, integrating tap weights and delays in one unit.
Abstract: A new spectrum-sliced microwave photonic filter exhibiting multitap characteristics, high-frequency operation, and insensitivity to the operating optical wavelength, is presented. It is based on an amplitude-modulated single sliced source and a novel sinusoidal group delay line structure, integrating tap weights and delays in one unit, and enabling multiple-tap signal processing without coherence interference limitations. Experimental results demonstrate the realization of a transversal filter response with 7.8-GHz free spectral range and 40-dB out-of-band rejection ratio.
12 citations
TL;DR: A new photonic signal processor structure that can realize multiple-taps, with a general response capability, low-noise and widely tunable processor operation, is presented.
Abstract: A new photonic signal processor structure that can realise multiple-taps, with a general response capability, low-noise and widely tunable processor operation, is presented. It is based on a novel concept of employing positive and negative group delay slopes simultaneously by means of a dual-fed chirped fiber Bragg grating, and a new wavelength mapping scheme that enables wavelength re-use. The technique offers scalability, arbitrary responses with both positive and negative taps, tunability, and high frequency operation. Experimental results demonstrate widely tunable filters, with arbitrary bipolar tap generation, no PIIN noise, and with high FSR.
12 citations
TL;DR: In this article, a new microwave photonic filter structure realising fully programmable RF filtering that can tune the filter center frequency and also reconfigure the filter shape, while exhibiting multiple taps and bipolar taps, is presented.
Abstract: A new microwave photonic filter structure realising fully programmable RF filtering that can tune the filter centre frequency and also reconfigure the filter shape, while exhibiting multiple taps and bipolar taps, is presented. It is based on a new arbitrary spectrum slicing technique using a multi-port programmable wavelength processor, based on liquid crystal on silicon pixels, which offers programmable finite impulse response filtering using software control. Experimental results demonstrate a high-order microwave filter with tunability, reconfigurability, bipolar taps, and with high free spectral range.
9 citations
Proceedings Article•
23 Mar 2009
TL;DR: Theoretical and measured results for a dielectric rod antenna operating at 600 GHz are presented in this article, where the authors describe the fabrication of a prototype antenna by laser ablation.
Abstract: Dielectric rod antennas have advantages as elements of focal plane arrays for imaging applications at terahertz frequencies. As well as good directivity and moderate bandwidth they are readily integrated with diode detectors. To demonstrate these attributes we describe the fabrication of a prototype antenna by laser ablation. Theoretical and measured results are presented for a dielectric rod antenna operating at 600 GHz.
8 citations
TL;DR: In this article, a new structure for realizing an equivalent multitap bandpass filter response without coherent interference and phase noise limitations is presented, based on intensity modulating a continuous-wave light multiple times to obtain many taps, and also enables windowing to be employed.
Abstract: A new structure for realizing an equivalent multitap bandpass filter response without coherent interference and phase noise limitations is presented. It is based on intensity modulating a continuous-wave light multiple times to obtain many taps, and also enables windowing to be employed. Experimental results are presented that demonstrate a multiple-tap bandpass filter with high rejection ratio and with no coherence and phase-induced intensity noise limitations.
6 citations
10 Nov 2009
TL;DR: In this article, the profile of a dielectric rod antenna is optimized to achieve a radiation pattern suitable for use in a terahertz imaging array, and the radiation pattern is obtained using a single antenna.
Abstract: The profile of a dielectric rod antenna is optimized to achieve a radiation pattern suitable for use in a terahertz imaging array.
6 citations
13 Jul 2009
TL;DR: In this article, a spectrum sliced photonic signal processor is presented, which addresses the challenges of dispersion induced distortion and noise mitigation, together with a novel multi-tap filter with insensitivity to the operating optical wavelength.
Abstract: Recent new developments in spectrum sliced photonic signal processors, which address the challenges of dispersion induced distortion and noise mitigation are presented, together with a novel multi-tap filter with insensitivity to the operating optical wavelength.
2 citations
TL;DR: In this paper, a delayed differential technique using a complementary output electro-optic modulator together with appropriate time delay and polarization effects was used to cancel the dominant phase-induced intensity noise at the filter passband frequency.
Abstract: In this paper, a new technique that can suppress the dominant phase-induced intensity noise (PIIN) in general delay-line signal processor structures is presented. It is based on a delayed differential technique using a complementary output electro-optic modulator together with appropriate time delay and polarization effects to cancel the PIIN noise at the filter passband frequency. Experimental results using the delayed differential technique demonstrate a PIIN noise reduction of 19 dB at the filter passband for an amplified recirculating delay-line bandpass filter, together with a fourfold increase in the free spectral range and a 10 dB increase in the bandpass filter rejection level.
1 citations
13 Jul 2009
TL;DR: In this paper, a microwave photonic filter based on spectrum slicing technique is proposed and experimentally demonstrated, which realizes a multi-tap, transversal RF filter featuring reconfigurablity and tunablity.
Abstract: We propose and experimentally demonstrate a new microwave photonic filter based on a spectrum slicing technique, which realizes a multi-tap, transversal RF filter featuring reconfigurablity and tunablity.
01 Jan 2009
TL;DR: In this article, a new structure for realizing an equivalent multitap bandpass filter response without coherent interference and phase noise limitations is presented, based on intensity modulating a continuous-wave light multiple times to obtain many taps, and also enables windowing to be employed.
Abstract: A new structure for realizing an equivalent multitap bandpass filter response without coherent interference and phase noise limitations is presented. It is based on intensity modulating a continuous-wave light multiple times to obtain many taps, and also enables windowing to be employed. Experimental results are pre- sented that demonstrate a multiple-tap bandpass filter with high rejection ratio and with no coherence and phase-induced intensity noise limitations.
Proceedings Article•
01 Dec 2009TL;DR: In this article, a coherence-free RF/microwave photonic signal processor based on a frequency-shifting delay line structure with an optical filter is presented, which can realize a high skirt selectivity and high stopband attenuation bandpass filter response.
Abstract: A novel coherence-free RF/microwave photonic signal processor based on a frequency-shifting delay line structure with an optical filter is presented. It can realise a high skirt selectivity and high stopband attenuation bandpass filter response.