scholarly journals Photonic-Assisted Scanning Receivers for Microwave Frequency Measurement

2019 ◽  
Vol 9 (2) ◽  
pp. 328 ◽  
Author(s):  
Shijie Song ◽  
Xiaoke Yi ◽  
Lu Gan ◽  
Wenjian Yang ◽  
Linh Nguyen ◽  
...  
Keyword(s):  
Spectral Response ◽  
Optical Filter ◽  
Microwave Frequency ◽  
Matrix Pencil ◽  
Frequency Measurement ◽  
Optical Signal ◽  
Filter Bandwidth ◽  
Measurement Resolution ◽  
The Matrix ◽  
Microwave Signals

We present a novel technique based on matrix pencil assisted deconvolution to improve the measurement resolution in scanning receiver systems for microwave frequency measurements. By modeling the scanning receiver output as the cross-correlation of the input modulated signal with the filter’s spectral response and applying the matrix pencil algorithm to convolve the detected optical signal at the receiver output, our technique offers precise estimations of both the frequency and power information of microwave signals with an improved measurement resolution. A multi-tone microwave signal measurement based on an optical filter is experimentally demonstrated, showing a significant measurement resolution reduction from 1 GHz to 0.4 GHz for two radio frequency (RF) tones, which is only about 30.2% of the optical filter bandwidth.

Simplified photonic approach for high-coding-efficiency, digitalized microwave frequency measurement using multiple optical filter arrays with different FSRs

2014 ◽  
Author(s):  
Bing Lu ◽  
Wei Pan ◽  
Xihua Zou ◽  
Peixuan Li ◽  
Xinkai Liu ◽  
...  
Keyword(s):  
Optical Filter ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Coding Efficiency

scholarly journals Optimization of tunable guided-mode resonance filter based on refractive index modulation of graphene

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hwa-Seub Lee ◽  
Joon Young Kwak ◽  
Tae-Yeon Seong ◽  
Gyu Weon Hwang ◽  
Won Mok Kim ◽  
...  
Keyword(s):  
Near Infrared ◽  
Spectral Response ◽  
Extinction Ratio ◽  
Optical Filter ◽  
Optical Signal ◽  
Design Guidelines ◽  
Refractive Index Modulation ◽  
Guided Mode ◽  
Index Contrast ◽  
Guided Mode Resonance

AbstractTo fabricate a tunable optical filter with a fast response in the near infrared region, a tunable guided-mode resonance (GMR) filter using graphene was proposed and its performance was optimized. In this study, a rigorous coupled wave analysis method was employed to systematically investigate the effects of geometrical configuration of graphene-integrated GMR filters and the optical properties of constituent materials including graphene on their spectral response in terms of tunability and extinction ratio. It was found that as the graphene is located close to the waveguide and the evanescent-field strength at the interface increases, the GMR filter exhibits better tunability. The bandwidth of the filter could be drastically reduced by adopting a low-index contrast grating layer, so that the extinction ratio of an optical signal could be greatly improved from 0.91 dB to 27.99 dB as the index contrast decreased from 0.99 to 0.47, respectively. Furthermore, new practical device designs, that is easy to fabricate and effectively implement the electric-field doping of graphene at low gate voltage, were also suggested and theoretically validated. These results demonstrate not only the excellent potential of a graphene-based tunable GMR filter but also provide practical design guidelines for optimizing the device performance.

Optimization of Parameters for Optimal Performance

2015 ◽  
pp. 272-284
Keyword(s):  
Spectral Density ◽  
Wavelength Division Multiplexing ◽  
Duty Cycle ◽  
Optical Filter ◽  
Spectral Width ◽  
Optical Signal ◽  
Signal Pulse ◽  
Filter Bandwidth ◽  
Wavelength Division ◽  
Optical Time

The impact of the signal pulse width and the optical filter bandwidth on the performance of both RZ and NRZ On-Off Keying (OOK) Optical Time Division Multiplexing (OTDM)-Wavelength Division Multiplexing (WDM) systems are studied in this chapter. Using polynomial fitting, an approximated expression for the optimal signal pulse duty cycle as a function of the spectral density SD and Optical Signal to Noise Ratio (OSNR) is provided. Further, it is found that the bit rate per WDM channel does not affect the optimum signal pulse duty cycle. As the spectral density SD increases, DCopt increases, reducing the signal spectral width to compensate for the reduced the WDM channel frequency spacing ?f. For increasing OSNR, DCopt increases slightly, especially at higher SD. The authors found that ideal NRZ performs better than optimized RZ at high SD but worse at low SD.

scholarly journals 2.45 GHz Band Quadrature Microwave Frequency Discriminators with Integrated Correlators Based on Power Dividers and Rat-Race Hybrids

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2763
Author(s):  
Adam Rutkowski ◽  
Hubert Stadnik
Keyword(s):  
Printed Circuit Board ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Wide Frequency Range ◽  
Circuit Board ◽  
Current Frequency ◽  
Power Dividers ◽  
Microwave Signals ◽  
Accuracy Of Measurement ◽  
Frequency Discriminators

Instantaneous frequency measurement devices are useful for conducting extremely fast measurements of the current frequency value of microwave signals, even if their duration is extremely short. This paper presents the principle of determination of temporary values of the microwave signal phase and frequency using interferometer techniques, based on passive microwave components. Additionally, the structures and results of measurements of two novel versions of integrated microwave correlators for microwave frequency discriminators, made on a single printed circuit board, are shown. Three Wilkinson-type, single-stage power dividers, and two rat-race hybrids create the developed correlators. The developed devices were designed to work over a wide frequency range, i.e., of 1.6–3.1 GHz, and can be used to monitor Wi-Fi devices as well as pulse and CW radar systems operating in the S band. They can also be applied in passive radars and active Doppler radars. The view of the printed circuits boards and results of measurements are presented. Recommendations for improving the accuracy of measurement are proposed.

Interpolation of Missing Antenna Measurements or RCS Data Using the Matrix Pencil Method

2018 ◽  
Author(s):  
Nicolas F. Reginelli ◽  
Tapan K. Sarkar ◽  
Magdalena Salazar-Palma
Keyword(s):  
Matrix Pencil ◽  
Matrix Pencil Method ◽  
Antenna Measurements ◽  
The Matrix

Application of the Matrix Pencil Approach to Direction Finding

1991 ◽  
Author(s):  
Braham Himed ◽  
Donald D. Weiner
Keyword(s):  
Matrix Pencil ◽  
Direction Finding ◽  
The Matrix

scholarly journals Locating Ships Using Time Reversal and Matrix Pencil Method by Their Underwater Acoustic Signals

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5065
Author(s):  
Daniel Chaparro-Arce ◽  
Sergio Gutierrez ◽  
Andres Gallego ◽  
Cesar Pedraza ◽  
Felix Vega ◽  
...  
Keyword(s):  
Time Reversal ◽  
Communication Channel ◽  
Matrix Pencil ◽  
Acoustic Signals ◽  
Underwater Acoustic ◽  
Low Bit Rate ◽  
Matrix Pencil Method ◽  
The Matrix ◽  
Resonance Expansion ◽  
Passive Sensors

This paper presents a technique, based on the matrix pencil method (MPM), for the compression of underwater acoustic signals produced by boat engines. The compressed signal, represented by its complex resonance expansion, is intended to be sent over a low-bit-rate wireless communication channel. We demonstrate that the method can provide data compression greater than 60%, ensuring a correlation greater than 93% between the reconstructed and the original signal, at a sampling frequency of 2.2 kHz. Once the signal was reconstituted, a localization process was carried out with the time reversal method (TR) using information from four different sensors in a simulation environment. This process sought to achieve the identification of the position of the ship using only passive sensors, considering two different sensor arrangements.

scholarly journals Photonic approach to microwave frequency measurement with digital circular-code results

2011 ◽  
Vol 19 (21) ◽  
pp. 20580 ◽  
Author(s):  
Xihua Zou ◽  
Wei Pan ◽  
Bin Luo ◽  
Lianshan Yan ◽  
Yushi Jiang
Keyword(s):  
Microwave Frequency ◽  
Frequency Measurement ◽  
Circular Code
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