scholarly journals Ripple Suppression in Broadband Microwave Photonic Phase Shifter Frequency Response

2018 ◽  
Vol 8 (12) ◽  
pp. 2433 ◽  
Author(s):  
Weicheng Xia ◽  
Ruiqi Zheng ◽  
Bijuan Chen ◽  
Erwin Chan ◽  
Xudong Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
Phase Shifter ◽  
Dynamic Range ◽  
Optical Filter ◽  
Signal Amplitude ◽  
Wide Frequency Range ◽  
Amplitude Variation ◽  
Microwave Photonic ◽  
Phase Deviation ◽  
Hybrid Coupler

This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator output due to the 90° hybrid coupler amplitude and phase imbalance. This resulted in phase shifter output RF signal amplitude variation and phase deviation. Experimental results demonstrated that incorporating an optical filter in the phase shifter structure can reduce the amplitude variation and phase deviation from 4.2 dB to 2.2 dB and from ±12° to ±3.8°, respectively, over a wide frequency range. A comparison of the loss and the dynamic range of the microwave photonic phase shifter implemented using a 90° hybrid coupler with a conventional fiber optic link is also presented.

scholarly journals Electronically Controllable Phase Shifter with Progressive Impedance Transformation at K Band

2019 ◽  
Vol 9 (23) ◽  
pp. 5229
Author(s):  
Mohamed T. ElKhorassani ◽  
Angel Palomares-Caballero ◽  
Antonio Alex-Amor ◽  
Cleofás Segura-Gómez ◽  
Pablo Escobedo ◽  
...  
Keyword(s):  
Phase Shift ◽  
Phase Shifter ◽  
Dynamic Range ◽  
Phase Shifting ◽  
Final Phase ◽  
Hybrid Coupler ◽  
Electronically Tunable ◽  
Electronically Controllable ◽  
Good Agreement ◽  
K Band

This communication presents the design of a two-port electronically tunable phase shifter at K band. The phase shifter consists of a 3 dB hybrid coupler loaded with reflective phase-controllable circuits. The reflective circuits are formed by varactors and non-sequential impedance transformers which increase the operational bandwidth and the provided phase shift. The final phase shifter design is formed by two loaded-coupler stages of phase shifting to guarantee a complete phase turn. An 18 GHz phase shifter design with dynamic range of 600 degrees of phase shift is depicted in this document. The prototype is manufactured and validated through measurements showing good agreement with the simulation results.

scholarly journals Дефектная мода в СВЧ волноводных брэгговских структурах с металлическими штырями

2019 ◽  
Vol 89 (10) ◽  
pp. 1606
Author(s):  
Д.А. Усанов ◽  
А.В. Скрипаль ◽  
В.Н. Посадский ◽  
В.С. Тяжлов ◽  
А.В. Байкин
Keyword(s):  
Photonic Crystal ◽  
Frequency Response ◽  
Band Gap ◽  
Dynamic Range ◽  
Defect Mode ◽  
Response Functions ◽  
Bragg Structure ◽  
Microwave Photonic ◽  
Gap Characteristics ◽  
Wide Wall

AbstractA waveguide Bragg structure containing equidistant cylindrical pins that are galvanically coupled to a wide wall of the waveguide is used to implement frequency response functions characterized by the presence of a band gap. Characteristics of a defect mode of the microwave photonic crystal with a pin element as a defect with an n – i – p – i – n structure with controlled conductivity placed in the capacitive gap are experimentally studied and calculated. Controlled reflectance of a microwave signal with a dynamic range of greater than 50 dB is obtained at the frequency of the defect mode.

scholarly journals Research on the Frequency Response and Dynamic Range of the Quadrature Fiber Optic Fabry–Perot Cavity Microphone Based on the Differential Cross Multiplication Demodulation Algorithm

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6152
Author(s):  
Baokai Ren ◽  
Jin Cheng ◽  
Longjiang Zhao ◽  
Zhenghou Zhu ◽  
Xiaoping Zou ◽  
...  
Keyword(s):  
Frequency Response ◽  
Differential Cross ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Sampling Rate ◽  
Data Sampling ◽  
Upper Limit ◽  
Fabry Perot ◽  
Quadrature Phase ◽  
Phase Deviation

A quadrature fiber optic Fabry–Perot cavity microphone based on a differential cross multiplication algorithm consists of a pair of fibers and a membrane. It has many advantages such as high sensitivity, a simple structure, and resistance to electromagnetic interference. However, there are no systematic studies on its key performance, for example, its frequency response and dynamic range. In this paper, a comprehensive study of these two key parameters is carried out using simulation analysis and experimental verification. The upper limit of the frequency response range and the upper limit of the dynamic range influence each other, and they are both affected by the data sampling rate. At a certain data sampling rate, the higher the upper limit of the frequency response range is the lower the upper limit of the dynamic range. The quantitative relationship between them is revealed. In addition, these two key parameters also are affected by the quadrature phase deviation. The quadrature phase deviation should not exceed 0.25π under the condition that the demodulated signal intensity is not attenuated by more than 3 dB. Subsequently, a short-step quadrature Fabry–Perot cavity method is proposed, which can suppress the quadrature phase deviation of the quadrature fiber optic Fabry–Perot cavity microphone based on the differential cross multiplication algorithm.

Mitigating the Effects of Non-Linear Distortion Using Polarizers in Microwave Photonic Link

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Sarika Singh ◽  
Sandeep K. Arya ◽  
Shelly Singla
Keyword(s):  
Dynamic Range ◽  
Extinction Ratio ◽  
Polarization Angle ◽  
Third Order ◽  
Microwave Photonic ◽  
Linear Behavior ◽  
Spurious Free Dynamic Range ◽  
Non Linear ◽  
Intermodulation Distortions ◽  
Insertion Losses

AbstractA scheme to suppress nonlinear intermodulation distortion in microwave photonic (MWP) link is proposed by using polarizers to compensate inherent non-linear behavior of dual-electrode Mach-Zehnder modulator (DE-MZM). Insertion losses and extinction ratio have also been considered. Simulation results depict that spurious free dynamic range (SFDR) of proposed link reaches to 130.743 dB.Hz2/3. A suppression of 41 dB in third order intermodulation distortions and an improvement of 15.3 dB is reported when compared with the conventional link. In addition, an electrical spectrum at different polarization angles is extracted and 79^\circ is found to be optimum value of polarization angle.

Optical-to-RF phase shift conversion-based microwave photonic phase shifter using a fiber Bragg grating

2013 ◽  
Vol 39 (1) ◽  
pp. 142 ◽  
Author(s):  
Xudong Wang ◽  
Erwin H. W. Chan ◽  
Robert A. Minasian
Keyword(s):  
Phase Shift ◽  
Fiber Bragg Grating ◽  
Phase Shifter ◽  
Bragg Grating ◽  
Microwave Photonic

Estimation of Transformer Winding Capacitances through Frequency Response Analysis – An Experimental Investigation

2013 ◽  
Vol 14 (6) ◽  
pp. 549-559 ◽  
Author(s):  
Krupa Shah ◽  
K. Ragavan
Keyword(s):  
Frequency Response ◽  
Wide Frequency Range ◽  
Response Analysis ◽  
Voltage Distribution ◽  
Response Data ◽  
Non Invasive ◽  
Transformer Winding ◽  
Invasive Method ◽  
Ladder Network ◽  
Good Agreement

Abstract This article focuses on developing a non-invasive method for determining capacitances using frequency response data. The proposed methodology involves acquiring driving-point impedance of the winding under consideration over wide frequency range. With certain terminal conditions and using the terminal impedance measured at specific frequencies, input and shunt capacitances are determined. For the purpose of estimating series capacitance of the winding, an algorithm is proposed. To demonstrate the capability of the method, initially model coils that have provisions for connecting external capacitances are considered. Then, it is found that the estimated values of capacitances are nearly same as those of connected capacitances. The method is, then, extended to transformer winding, and a capacitive ladder network is constructed. To assess the accuracy of estimation, capacitive voltage distribution is utilized. That is, the voltage distribution in the winding is compared with that of synthesized circuit. A good agreement between those data reveals that the estimated capacitance values are accurate.

Wideband and Dispersion Immune Microwave Photonic Phase Shifter With Tunable Optical Carrier to Sideband Ratio

2020 ◽  
Vol 38 (19) ◽  
pp. 5262-5269 ◽  
Author(s):  
Yunping Bai ◽  
Mingzheng Lei ◽  
Zhennan Zheng ◽  
Jinwang Qian ◽  
Xiyao Song ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Optical Carrier ◽  
Microwave Photonic ◽  
Sideband Ratio
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