High-performance microwave transversal filter using fiber Bragg grating arrays

Guo, Yu; Zhang, W.; Williams, J.A.R.

doi:10.1109/68.874229

Cited by 106 publications

(60 citation statements)

References 11 publications

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“…This grating is so placed that the optical path difference between the two arms is exactly eight times that of the unit delay time which is related to the spacing between the adjacent two taps. Therefore, the filter Q factor has been doubled and the filter rejection level has been enhanced with respect to results published in previous work [49].…”

Section: Fibre Grating Delay Line Filtersmentioning

confidence: 83%

“…Although the tuneability is certainly restricted, the response of the filter can be improved by weighting the reflections of the gratings (stop-band attenuation of 12 dB). Another scheme using eight grating elements [49] enables the choice of more appropriate tap weighting functions and provides stopband attenuation of over 30 dB by using a Hamming windowing function. Since this filter works incoherently, the FSR is therefore limited by requiring differential delays greater than the optical coherence length of the laser source.…”

Section: Fibre Grating Delay Line Filtersmentioning

confidence: 99%

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Microwave Photonic Signal Processing

Iezekiel

2009

Microwave Photonics

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The full exploitation of the advantages that radio frequency, microwave and millimetre-wave technologies bring to broadband telecommunications and other related applications requires a coordinated effort in the development of signal processing techniques suitable for them. This is especially important as novel applications demand the use of increasingly higher-frequency carriers and broadband signals.The traditional approach towards radio frequency (RF) signal processing is illustrated in the upper part of Figure 8.1. Here an RF signal originating from an RF source or coming from an antenna is fed to an RF circuit that performs the signal processing tasks either at the RF signal or at an intermediate frequency band after a down-conversion operation. In any case, the RF circuit is capable of performing the signal processing tasks for which it has been designed only within a specified (often reduced) spectral band. This approach results in poor flexibility since changing the band of the signals to be processed requires the design of a novel RF circuit and possibly the use of different hardware technology. Furthermore, even if the RF carrier is not changed, the nature of the modulating signal might be, thus requiring more bandwidth or sampling speed from the processor. This is especially true in the case where discrete time signal processing has to be carried over the RF signal. This set of drawbacks is often termed in the optical communications technology literature as the electronic bottleneck. Although important it is by no means the only source of degradation, since electromagnetic interference (EMI) and frequency dependent losses can also be sources of major impairments.An interesting approach to overcome the above limitations involves the use of photonics technology and especially fibre and integrated optics devices and circuits to perform the Microwave Photonics: Devices and Applications Edited by Stavros Iezekiel

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Section: Fibre Grating Delay Line Filtersmentioning

confidence: 83%

Section: Fibre Grating Delay Line Filtersmentioning

confidence: 99%

Microwave Photonic Signal Processing

Iezekiel

2009

Microwave Photonics

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“…Meandered PIFA As shown in Figure 1, a meandered antenna is designed for implantable medical devices inside a human body at the MICS frequency band (402-405 MHz). Because the designed antenna uses a grounding pin at the end of the printed radiator, the operation principle is the same as that of a PIFA [6]. The printed radiator is located between the substrate and superstrate dielectric layers whose dielectric constants are 10.2 and thicknesses are 1.25 mm, respectively.…”

Section: Design Of Implanted Pifamentioning

confidence: 99%

Reconfigurable and tunable microwave-photonics bandpass-slicing filter using a dynamic gain equalizer

Gouraud¹,

Bin²,

Billonnet³

et al. 2006

Microw. Opt. Technol. Lett.

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surface is smaller than that of the flat surface. That is because the Brewster angle between ground and snow is 50°. The 50°angle in snow corresponds to 35°in air by Snell's law. However, at the higher frequency of 36.5 GHz in Figure 4, volume scattering becomes important and obscures the Brewster-angle effect of the snow-ground interface. At 36.5 GHz, rough-surface brightness temperatures are lower than that of flat surface for both V-polarization and H-polarization.Figures 5 and 6 compare results of flat and rough surfaces as a function of observation angle for the case of larger grain size of diameter equal to 0.6 mm. Volume scattering becomes important at 18.7 GHz. The Brewster-angle effect of the snow-ground interface disappears. The roughness decreases the brightness temperatures.Figures 7 and 8 compare the results of flat and rough surfaces as a function of depth of snow; the grain size is also 0.6 mm. At 18.7 GHz, since the observation angle is 30°(which is less than the Brewster angle of 35°), the brightness temperatures of rough surface is smaller than flat surface for V-polarization.In Figure 8, we see that at 36.5 GHz, saturation occurs at large snow depth. Volume scattering becomes dominant and roughness has a negligible effect. Brightness-Temperature Variations with Grain Size and Snow DepthFigures 9 and 10 show the angular variations of brightness temperatures for several grain-size diameters. The brightness temperatures decrease with increasing grain size. Emission from the ground is scattered and cannot reach the air region, thus accounting for the decrease in brightness temperatures.Figures 11 and 12 show that, for small grain size, brightness temperatures depend weakly on the thicknesses of the snow layer. For larger grain size, brightness temperatures decrease with snow depth at 18.7 GHz. For 36.5 GHz, saturation effects occur as a function of snow depth. ACKNOWLEDGMENTSThe research presented in this paper was supported by RGC Central Allocation Grant no. 8730017 of Hong Kong and NASA of the United States. 1. C.M. Lam and A. Ishimaru, Mueller matrix calculation for a slab of random medium with

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“…현재까지 제안된 MWP 필터의 구조는 광섬유 격자 배 열(Fiber Bragg Grating: FBG)을 이용하는 방식 [3] , FBG와 이진 광섬유 지연선로를 이용한 방식 [4] , 다채널 첩 광섬 유 격자(Chirped Fiber Grating: CFG)를 이용한 방식 …”

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Microwave Photonic Filter Using Optical True-Time-Delay Line Matrix

정병민

2015

The Journal of Korean Institute of Electromagnetic Engineering

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. 현재까지 제안된 MWP 필터의 구조는 광섬유 격자 배 열(Fiber Bragg Grating: FBG)을 이용하는 방식 [3] , FBG와 이진 광섬유 지연선로를 이용한 방식 [4] , 다채널 첩 광섬 유 격자(Chirped Fiber Grating: CFG)를 이용한 방식 AbstractMicrowave Photonic(MWP) filters capable of use a bandpass filter or a notch filter with large bandwidth have been proposed. 4-lines×2-bit fiber-optic delay lines with a unit time-delay difference of 50 ps were experimentally realized. By changing the time-delay difference and the coefficients of microwave-modulated optical signals, the bandpass and notch filters were implemented and characterized.

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High-performance microwave transversal filter using fiber Bragg grating arrays

Cited by 106 publications

References 11 publications

Microwave Photonic Signal Processing

Microwave Photonic Signal Processing

Reconfigurable and tunable microwave-photonics bandpass-slicing filter using a dynamic gain equalizer

Microwave Photonic Filter Using Optical True-Time-Delay Line Matrix

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