Measurement of visual index in tunnels using automatic gain controlled laser diodes and a homodyne detection scheme

2004 ◽  
Vol 233 (4-6) ◽  
pp. 397-402
Author(s):  
Jongtaek Park ◽  
Donghyun Seo ◽  
Bonjeong Koo ◽  
Youngil Park
Keyword(s):  
Laser Diodes ◽  
Homodyne Detection ◽  
Detection Scheme ◽  
Visual Index

Homodyne-like detection scheme based on photon-number-resolving detectors

2017 ◽  
Vol 15 (08) ◽  
pp. 1740016 ◽  
Author(s):  
Alessia Allevi ◽  
Matteo Bina ◽  
Stefano Olivares ◽  
Maria Bondani
Keyword(s):  
Coherent States ◽  
Beam Splitter ◽  
Photon Number ◽  
Local Oscillator ◽  
Quantum States ◽  
Homodyne Detection ◽  
Detection Scheme ◽  
Light Signals ◽  
The Difference ◽  
Signal Field

Homodyne detection is the most effective detection scheme employed in quantum optics to characterize quantum states. It is based on mixing at a beam splitter the signal to be measured with a coherent state, called the “local oscillator,” and on evaluating the difference of the photocurrents of two photodiodes measuring the outputs of the beam splitter. If the local oscillator is much more intense than the field to be measured, the homodyne signal is proportional to the signal-field quadratures. If the local oscillator is less intense, the photodiodes can be replaced with photon-number-resolving detectors, which have a smaller dynamics but can measure the light statistics. The resulting new homodyne-like detector acquires a hybrid nature, being it capable of yielding information on both the particle-like (statistics) and wave-like (phase) properties of light signals. The scheme has been tested in the measurement of the quadratures of coherent states, bracket states and phase-averaged coherent states at different intensities of the local oscillator.

scholarly journals Simple Self-Homodyne Detection Scheme for Optical OFDM With Inserted Pilot Subframes and Application in Optical Access Networks

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 24602-24607 ◽  
Author(s):  
Guo-Wei Lu ◽  
Xun Guan ◽  
Takahide Sakamoto ◽  
Naokatsu Yamamoto ◽  
Calvin Chun-Kit Chan
Keyword(s):  
Access Networks ◽  
Homodyne Detection ◽  
Optical Access Networks ◽  
Detection Scheme ◽  
Optical Access ◽  
Optical Ofdm

Readout-Signal Amplification by Homodyne Detection Scheme

2007 ◽  
Author(s):  
Hideharu Mikami ◽  
Takeshi Shimano ◽  
Hiromi Kudo ◽  
Jiro Hashizume ◽  
Harukazu Miyamoto
Keyword(s):  
Signal Amplification ◽  
Homodyne Detection ◽  
Detection Scheme ◽  
Readout Signal

Moment Operators of Observables in the Balanced Homodyne Detection Scheme

2007 ◽  
Author(s):  
Jukka Kiukas ◽  
Guillaume Adenier ◽  
Andrei Yu. Khrennikov ◽  
Pekka Lahti ◽  
Vladimir I. Man'ko ◽  
...  
Keyword(s):  
Homodyne Detection ◽  
Detection Scheme

scholarly journals Spatial spectroscopy for high resolution imaging

2020 ◽  
Vol 238 ◽  
pp. 06005
Author(s):  
Arturo Villegas ◽  
Juan P. Torres
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Hyperspectral Imaging ◽  
Optimal Estimation ◽  
High Resolution Imaging ◽  
Homodyne Detection ◽  
Detection Scheme ◽  
Spatial Modes ◽  
Resolution Imaging ◽  
Complete Set

Quantum estimation theory provides bounds for the precision in the estimation of a set of parameters that characterize a system. Two questions naturally arise: Is any of these bounds tight? And if this is the case, what type of measurements can attain such a limit? In this work we show that for phase objects, it is possible to find a tight resolution bound. Moreover one can find a set of spatial modes whose detection provides an optimal estimation of the complete set of parameters for which we propose a homodyne detection scheme. We call this method spatial spectroscopy since it mimics in the spatial domain what conventional spectroscopy methods do in the frequency domain employing many frequencies (hyperspectral imaging).

scholarly journals Phase sensitivity of an $\operatorname{SU}(1,1)$ interferometer via product detection

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Qingle Wang ◽  
Yami Fang ◽  
Xiaoping Ma ◽  
Dong Li
Keyword(s):  
Coherent States ◽  
The Other ◽  
Phase Sensitivity ◽  
Homodyne Detection ◽  
Quantum Metrology ◽  
Parametric Amplifiers ◽  
Detection Scheme ◽  
Beam Splitters ◽  
Cramer Rao Bound

AbstractWe theoretically analyze the phase sensitivity of an $\operatorname{SU}(1,1)$ SU ( 1 , 1 ) interferometer with various input states by product detection in this paper. This interferometer consists of two parametric amplifiers that play the role of beam splitters in a traditional Mach–Zehnder interferometer. The product of the amplitude quadrature of one output mode and the momentum quadrature of the other output mode is measured via balanced homodyne detection. We show that product detection has the same phase sensitivity as parity detection for most cases, and it is even better in the case with two coherent states at the input ports. The phase sensitivity is also compared with the Heisenberg limit and the quantum Cramér–Rao bound of the $\operatorname{SU}(1,1)$ SU ( 1 , 1 ) interferometer. This detection scheme can be easily implemented with current homodyne technology, which makes it highly feasible. It can be widely applied in the field of quantum metrology.

scholarly journals Generation and coherent detection of QPSK signal using a novel method of digital signal processing

2018 ◽  
Vol 32 (04) ◽  
pp. 1850103
Author(s):  
Yuan Zhao ◽  
Bingliang Hu ◽  
Zhen-An He ◽  
Wenjia Xie ◽  
Xiaohui Gao
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Digital Signal ◽  
Local Oscillator ◽  
Coherent Detection ◽  
Detection Methods ◽  
Homodyne Detection ◽  
Modulation Formats ◽  
Detection Scheme ◽  
Labview Software

We demonstrate an optical quadrature phase-shift keying (QPSK) signal transmitter and an optical receiver for demodulating optical QPSK signal with homodyne detection and digital signal processing (DSP). DSP on the homodyne detection scheme is employed without locking the phase of the local oscillator (LO). In this paper, we present an extracting one-dimensional array of down-sampling method for reducing unwanted samples of constellation diagram measurement. Such a novel scheme embodies the following major advantages over the other conventional optical QPSK signal detection methods. First, this homodyne detection scheme does not need strict requirement on LO in comparison with linear optical sampling, such as having a flat spectral density and phase over the spectral support of the source under test. Second, the LabVIEW software is directly used for recovering the QPSK signal constellation without employing complex DSP circuit. Third, this scheme is applicable to multilevel modulation formats such as M-ary PSK and quadrature amplitude modulation (QAM) or higher speed signals by making minor changes.

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