Superresolution technology based on a heterodyne detection system

This paper presents performance analysis of cascaded radio frequency-free space optical communication-visible light communication (RF-FSO-VLC) system. The proposed model comprises of the RF link as the core network, a terrestrial optical link for providing last mile connectivity with the indoor cell users communicating through VLC environment. The RF link undergoes Nakagami-m distributed fading, while the terrestrial optical link is modeled by Double Generalized Gamma (DGG) distributed turbulence and Rayleigh-distributed misalignment losses. VLC links are characterized by the randomness in users’ position. Using statistical properties of system signal-to-noise ratio (SNR), outage and error performance of the proposed system is evaluated depending on whether the relays and the destination decode either perfectly or erroneously. The numerical results show that the system performance varies depending on field-of view (FOV) of the detector and user’s position. This is because as FOV increases along with the height of the LED, the outage probability of the system increases. Error probability depends on the type of detection techniques, where a heterodyne detection system performs better than a direct detection system. Moreover, through results it is inferred that severe fading and misalignment losses result in poor error performance of the considered system errors on the performance of the considered cooperative system.

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Effect of laser linewidth on crosstalk penalty in two-channel ASK heterodyne detection system

Electronics Letters ◽

10.1049/el:19880564 ◽

1988 ◽

Vol 24 (14) ◽

pp. 830

Author(s):

Y.H. Cheng ◽

T. Okoshi

Keyword(s):

Detection System ◽

Heterodyne Detection ◽

Laser Linewidth

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Télémètre à détection coherente avec un laser CO2 à ondes entretenues : étude et conception

Canadian Journal of Physics ◽

10.1139/p83-043 ◽

1983 ◽

Vol 61 (2) ◽

pp. 318-331 ◽

Cited By ~ 1

Author(s):

Denis Vincent ◽

Gabriel Otis

Keyword(s):

Detection System ◽

Signal To Noise Ratio ◽

Optical Power ◽

Experimental System ◽

Intermediate Frequency ◽

Local Oscillator ◽

Heterodyne Detection ◽

Signal To Noise ◽

Noise Ratio ◽

Rotating Target

We performed a theoretical and experimental study of a 10.6 μm heterodyne detection system with nonlinear postdetection. A single laser serves as both transmitter and local oscillator; the intermediate frequency is given by the Doppler effect due to a rotating target. An electrooptic crystal modulates the amplitude of the laser beam at a frequency of 15 kHz; a synchronous voltmeter measures the return signal after the nonlinear element. Values of the signal-to-noise ratio with respect to incident optical power agree with the results of the theoretical model. In particular, experimentally measured target-induced frequency spreading effects on the signal-to-noise ratio correspond to the predictions of the model. We also describe an experimental system.

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Short-range optical limited displacement resolution in laser heterodyne detection system

Acta Physica Sinica ◽

10.7498/aps.66.234208 ◽

2017 ◽

Vol 66 (23) ◽

pp. 234208

Author(s):

Yan Chun-Hui ◽

Wang Ting-Feng ◽

Zhang He-Yong ◽

L Tao ◽

Wu Shi-Song

Keyword(s):

Short Range ◽

Detection System ◽

Heterodyne Detection ◽

Laser Heterodyne

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Crosstalk and prefiltering in a two-channel ASK heterodyne detection system without the effect of laser phase noise

Journal of Lightwave Technology ◽

10.1109/50.4136 ◽

1988 ◽

Vol 6 (8) ◽

pp. 1312-1320 ◽

Cited By ~ 13

Author(s):

Y.-K. Park ◽

S.S. Bergstein ◽

R.E. Tench ◽

R.W. Smith ◽

S.K. Korotky ◽

...

Keyword(s):

Phase Noise ◽

Detection System ◽

Heterodyne Detection

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Effect of fiber and solenoid variation parameters on the elements of a corrector PID for electromagnetic fiber squeezer based polarization controller

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v10i3.pp2441-2451 ◽

2020 ◽

Vol 10 (3) ◽

pp. 2441 ◽

Cited By ~ 2

Author(s):

Abdallah Zahidi ◽

Amrane Said ◽

Nawfel Azami ◽

Naoual Nasser

Keyword(s):

Detection System ◽

Light Output ◽

Single Mode ◽

Single Mode Fiber ◽

Open Loop ◽

Polarization Controller ◽

Heterodyne Detection ◽

System Parameters ◽

Stability Performance ◽

The Stability

Controlling the polarization of the light output from single-mode fiber systems is very important for connecting it to polarization-dependent integrated optical circuits, while applications using a heterodyne detection system. Polarization controller using fiber squeezer is attractive for a low-loss, low-penalty coherent optical fiber trunk system. However, for polarization controllers using electromagnetic fiber squeezer, the stability problem due to the saturation of their magnetic circuit must be studied. In fact, in their conventional configuration, open-loop stability affects performance and limits applications. First at all, this effect has been analyzed and a feedback circuit with correctors has been proposed to improve stability performance. Then a simulation study is proposed to examine the influence of the system parameters on the corrector constants. The results of the simulation show that if the system parameters change the constants Kp, Ki and Kd of the PID corrector must be adjusted to keep an optimized dynamic response.

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