Dispersion Compensation Filter Design Optimized for Robustness and Power Efficiency

We characterized the electromagnetic field of ultra-short laser pulses after propagation through metallic photonic crystal structures featuring photonic and plasmonic resonances. The complete pulse information, i.e. the envelope and phase of the electromagnetic field, was measured using the technique of cross-correlation frequency resolved optical gating. In good agreement, measurements and scattering matrix simulations show a dispersive behaviour of the spectral phase at the position of the resonances. Asymmetric Fano-type resonances go along with asymmetric phase characteristics. Furthermore, the spectral phase is used to calculate the dispersion of the sample and possible applications in dispersion compensation are investigated. Group refractive indices of 700 and 70 and group delay dispersion values of 90 000 fs 2 and 5000 fs 2 are achieved in transverse electric and transverse magnetic polarization, respectively. The behaviour of extinction and spectral phase can be understood from an intuitive model using the complex transmission amplitude. An associated depiction in the complex plane is a useful approach in this context. This method promises to be valuable also in photonic crystal and filter design, for example, with regards to the symmetrization of the resonances. This article is part of the themed issue ‘New horizons for nanophotonics’.

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NOVEL DESIGN AND FPGA IMPLEMENTATION OF DA-RNS FIR FILTERS

Journal of Circuits System and Computers ◽

10.1142/s0218126604001970 ◽

2004 ◽

Vol 13 (06) ◽

pp. 1233-1249 ◽

Cited By ~ 6

Author(s):

WEI WANG ◽

M. N. S. SWAMY ◽

M. O. AHMAD

Keyword(s):

Power Efficiency ◽

Filter Design ◽

Finite Impulse Response ◽

Chinese Remainder Theorem ◽

Low Cost ◽

Digital Signal ◽

Number System ◽

Residue Number System ◽

Fpga Implementation ◽

Fir Filters

Field programmable gate array (FPGA)-based digital signal processing has been widely used in multimedia applications. By combining distributed arithmetic (DA) and residue number system (RNS) in such designs, efficient area, speed and power efficiency can be achieved. In this paper, we propose novel techniques for the design and FPGA implementation of DA-RNS finite impulse response (FIR) filters. By introducing a novel low-cost moduli set and its selection method, efficient modulo arithmetic units inside the subfilters are designed. Then, a new residue-to-binary conversion algorithm, a so-called modified DA Chinese remainder theorem, is derived to reduce the modulo operations and provide an efficient residue-to-binary converter suitable to FPGA implementation. Based on these proposed techniques, a seventh-order DA-RNS FIR filter is designed, implemented and tested by using Xilinx FPGA tools. The implementation results show that the proposed filter design consumes only 77% of the power that the existing filter12,13 requires, while maintaining the same speed (throughput).

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Power Efficiency and EMI Attenuation Optimization in Filter Design

IEEE Transactions on Electromagnetic Compatibility ◽

10.1109/temc.2017.2765921 ◽

2018 ◽

Vol 60 (6) ◽

pp. 1811-1818 ◽

Cited By ~ 3

Author(s):

Moises Ferber ◽

Roberto Mrad ◽

Florent Morel ◽

Gael Pillonnet ◽

Christian Vollaire ◽

...

Keyword(s):

Power Efficiency ◽

Filter Design

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Maximizing the Area Spanned by the Optical SNR of the 5G Using Digital Modulators and Filters

The International Arab Journal of Information Technology ◽

10.34028/iajit/18/3/6 ◽

2021 ◽

Vol 18 (3) ◽

Author(s):

Guruviah Karpagarajesh ◽

Helen Anita

Keyword(s):

Optical Communication ◽

Free Space ◽

Communication Systems ◽

Power Efficiency ◽

Filter Design ◽

Weather Condition ◽

Channel Noise ◽

Free Space Optical Communication ◽

Free Space Optical ◽

Space Optical Communication

High security data link channels having more immunity against channel noise is the need of the century. Free Space Optical communication (FSO) is the modern technology which kick-starts it’s application in inter satellite communication, underwater communication and mobile communication to the next level of data transmission by means of complete utilisation of the allocated frequency spectrum. In Europe and Asian countries, 5G optical communication will going to expand its usage to nearly 50% in upcoming years and so bandwidth and power efficiency has to be enhanced as much as possible since the consumption rate of the users is increasing exponentially. But increasing the distance increases the attenuation in case of severe atmospheric weather condition. In this paper, 5G data rate of 50Gbps is ensured for better signal reception with maximum possible link distance between the sender and the receiver keeping variable attenuation environment. The frequency of operation is 1550nm throughout the processes. In this work, several digital modulation techniques and optical filters for receiver are designed and simulated. The better resulting modulator and filter design in terms of high Quality factor and low bit error rate are considered and is integrated with each other. The Signal to Noise Ratio (SNR) and optical SNR are calculated for the integrated design theoretically. Higher the SNR less will be BER and hence the signal connectivity can be improved in the high speed free space optical communication systems.

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