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

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

USE OF A CO2LASER AS A LOCAL OSCILLATOR FOR A 10 MICRON HETERODYNE DETECTION

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-569-C7-571
Author(s):  
A. DELAHAIGUE ◽  
D. COURTOIS ◽  
C. THIEBEAUX ◽  
H. LE CORRE
Keyword(s):  
Local Oscillator ◽  
Heterodyne Detection

scholarly journals Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shengjun Ren ◽  
Shuai Yang ◽  
Adrian Wonfor ◽  
Ian White ◽  
Richard Penty
Keyword(s):  
Distribution System ◽  
Repetition Rate ◽  
Quantum Key Distribution ◽  
Optimization Technique ◽  
Key Distribution ◽  
Local Oscillator ◽  
Continuous Variable ◽  
Noise Model ◽  
System Level ◽  
Excess Noise

AbstractWe present an experimental demonstration of the feasibility of the first 20 + Mb/s Gaussian modulated coherent state continuous variable quantum key distribution system with a locally generated local oscillator at the receiver (LLO-CVQKD). To increase the signal repetition rate, and hence the potential secure key rate, we equip our system with high-performance, wideband devices and design the components to support high repetition rate operation. We have successfully trialed the signal repetition rate as high as 500 MHz. To reduce the system complexity and correct for any phase shift during transmission, reference pulses are interleaved with quantum signals at Alice. Customized monitoring software has been developed, allowing all parameters to be controlled in real-time without any physical setup modification. We introduce a system-level noise model analysis at high bandwidth and propose a new ‘combined-optimization’ technique to optimize system parameters simultaneously to high precision. We use the measured excess noise, to predict that the system is capable of realizing a record 26.9 Mb/s key generation in the asymptotic regime over a 15 km signal mode fibre. We further demonstrate the potential for an even faster implementation.

scholarly journals Pilot-assisted intradyne reception for high-speed continuous-variable quantum key distribution with true local oscillator

Quantum ◽  
2019 ◽  
Vol 3 ◽  
pp. 193 ◽  
Author(s):  
Fabian Laudenbach ◽  
Bernhard Schrenk ◽  
Christoph Pacher ◽  
Michael Hentschel ◽  
Chi-Hang Fred Fung ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
High Speed ◽  
Local Oscillator ◽  
Continuous Variable ◽  
Excess Noise ◽  
Phase Matching ◽  
Optical Frequency ◽  
Single Sideband ◽  
Single Sideband Modulation ◽  
Optical Single Sideband

We present a pilot-assisted coherent intradyne reception methodology for CV-QKD with true local oscillator. An optically phase-locked reference tone, prepared using carrier-suppressed optical single-sideband modulation, is multiplexed in polarisation and frequency to the 250 Mbaud quantum signal in order to provide optical frequency- and phase matching between quantum signal and local oscillator. Our concept allows for high symbol rates and can be operated at an extremely low excess-noise level, as validated by experimental measurements.

scholarly journals Photon Correlation Spectroscopy Using Optical Heterodyne Detection

1981 ◽  
Vol 34 (5) ◽  
pp. 575 ◽  
Author(s):  
Guy C Fletcher ◽  
Julienne I Harnett
Keyword(s):  
Scattered Light ◽  
Local Oscillator ◽  
Correlation Spectroscopy ◽  
Polystyrene Latex ◽  
Heterodyne Detection ◽  
Experimental Comparison ◽  
Statistical Accuracy ◽  
Theoretical Predictions ◽  
Heterodyne Technique ◽  
Optical Heterodyne Detection

The detection by optical heterodyning of laser light scattered from solutions of macromolecules offers significant improvement in statistical accuracy over the more usual self-beating method. Nevertheless the heterodyne technique is not commonly used because of the supposed ifficulties associated with stable and efficient mixing of the scattered light with a local oscillator beam. We have carried out an experimental comparison of several methods of mixing the two beams, using very dilute solutions of polystyrene latex spheres as scatterers. Experimental data are also presented for the apparent particle radius as a function of the local oscillator level, and are compared with theoretical predictions.

A High-Power G-band Schottky Local Oscillator Chain for Submillimeter Wave Heterodyne Detection

2015 ◽  
Vol 36 (5) ◽  
pp. 430-444 ◽  
Author(s):  
Zhenhua Chen ◽  
Xiang Chen ◽  
Wanzhao Cui ◽  
Xiaojun Li ◽  
Junxiang Ge
Keyword(s):  
High Power ◽  
Local Oscillator ◽  
Submillimeter Wave ◽  
Heterodyne Detection
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