Excess-noise suppression in a fibre-optic balanced heterodyne detection system

1986 ◽  
Vol 18 (6) ◽  
pp. 445-454 ◽  
Author(s):  
R. Stierlin ◽  
R. Bättig ◽  
P. -D. Henchoz ◽  
H. P. Weber
Keyword(s):  
Noise Suppression ◽  
Detection System ◽  
Excess Noise ◽  
Heterodyne Detection ◽  
Fibre Optic

Local-oscillator excess-noise suppression for homodyne and heterodyne detection

1983 ◽  
Vol 8 (8) ◽  
pp. 419 ◽  
Author(s):  
G. L. Abbas ◽  
V. W. S. Chan ◽  
T. K. Yee
Keyword(s):  
Noise Suppression ◽  
Local Oscillator ◽  
Excess Noise ◽  
Heterodyne Detection

Property Improvement of Inter-Satellite DPSK Modulation/Self-Heterodyne Detection System by All-Optical 2R Regeneration

2013 ◽  
Vol 50 (9) ◽  
pp. 091405
Author(s):  
董毅 Dong Yi ◽  
赵尚弘 Zhao Shanghong ◽  
李勇军 Li Yongjun ◽  
韩磊 Han Lei ◽  
赵卫虎 Zhao Weihu
Keyword(s):  
Detection System ◽  
Heterodyne Detection ◽  
All Optical ◽  
2R Regeneration

scholarly journals Cascaded Rf-Fso-Vlc System using Df Relays

2019 ◽  
Vol 8 (10) ◽  
pp. 4357-4362
Keyword(s):  
Direct Detection ◽  
Detection System ◽  
Signal To Noise Ratio ◽  
Visible Light Communication ◽  
Heterodyne Detection ◽  
Core Network ◽  
Free Space Optical ◽  
Error Performance ◽  
Optical Link ◽  
Detection Techniques

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.

Superresolution technology based on a heterodyne detection system

2020 ◽  
Vol 59 (10) ◽  
pp. 3132 ◽  
Author(s):  
Hongzhou Dong ◽  
Mingwu Ao ◽  
Xianming Yang ◽  
Yong Liu ◽  
Chunping Yang
Keyword(s):  
Detection System ◽  
Heterodyne Detection

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

1983 ◽  
Vol 61 (2) ◽  
pp. 318-331 ◽  
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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