Dispersion measurement method with down conversion process

In this work, the cascaded second-order spontaneous parametric down-conversion (SPDC) is considered to produce pure state photon triplets in periodically poled lithium niobite (PPLN) doped with 5% MgO. A set of parameters are optimized through calculating the Schmidt number of two-photon states generated by each down-conversion process with different pump durations and crystal lengths. We use a Gaussian filter in part and obtain three photons with 100% purity in spectrum. We provide a feasible and unprecedented scheme to manipulate the spectrum purity of photon triplets in the communication band (C-band).

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Down-conversion process in Tb3+–Yb3+ co-doped Calibo glasses

Journal of Luminescence ◽

10.1016/j.jlumin.2012.02.019 ◽

2012 ◽

Vol 132 (7) ◽

pp. 1678-1682 ◽

Cited By ~ 49

Author(s):

I.A.A. Terra ◽

L.J. Borrero-González ◽

T.R. Figueredo ◽

J.M.P. Almeida ◽

A.C. Hernandes ◽

...

Keyword(s):

Conversion Process ◽

Down Conversion ◽

Co Doped

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Characteristics of a Chromatic Dispersion Measurement Method Using the Bidirectional Modulation of Optical Intensity Modulator

IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences ◽

10.1093/ietfec/e88-a.11.3260 ◽

2005 ◽

Vol E88-A (11) ◽

pp. 3260-3263

Author(s):

K.-S. JEON

Keyword(s):

Measurement Method ◽

Chromatic Dispersion ◽

Optical Intensity ◽

Intensity Modulator ◽

Dispersion Measurement ◽

Bidirectional Modulation

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Study on Harmonic Analysis and Error Correction in Synchro to Digital Conversion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.225-226.334 ◽

2011 ◽

Vol 225-226 ◽

pp. 334-337 ◽

Cited By ~ 1

Author(s):

Yan Liu ◽

Ze Gang Ye

Keyword(s):

Harmonic Analysis ◽

Error Correction ◽

Measurement Method ◽

Angle Measurement ◽

Conversion Process ◽

Matlab Simulation ◽

Angle Error ◽

Digital Conversion ◽

Current Implementation ◽

Improve Accuracy

The current implementation of the synchro to digital conversion (SDC) can not directly detect harmonic which can cause the problem of low precision angle measurement. To improve accuracy of angle, harmonic interference was analyzed and summarized in the axis-angle to digital conversion process. Through detailed research, a new angle measurement formula is proposed in this paper, this formula can be very good for angle error correction and compensation. In order to meet the practical requirements, a software measurement method based on FFT algorithm of harmonic analysis and error correction is put forward. Matlab simulation shows that the formula and method is effective and feasible.

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ANTINORMALLY ORDERED PHOTODETECTION OF CONTINUOUS-MODE FIELD

International Journal of Quantum Information ◽

10.1142/s0219749904000110 ◽

2004 ◽

Vol 02 (01) ◽

pp. 101-117 ◽

Cited By ~ 3

Author(s):

KOJI USAMI ◽

AKIHISA TOMITA ◽

KAZUO NAKAMURA

Keyword(s):

Wide Spectrum ◽

Zero Point ◽

Stimulated Emission ◽

Conversion Process ◽

Continuous Mode ◽

Detection Process ◽

Mode Field ◽

Parametric Down Conversion ◽

Distinct Features ◽

Down Conversion

When the electromagnetic field is detected by stimulated emission, rather than by absorption, antinormally ordered photodetection can be realized. One of the distinct features of this photodetection scheme is its sensitivity to zero-point fluctuation due to the existence of the spontaneous emission. We have recently succeeded in experimentally demonstrating the antinormally ordered photodetection by exploiting nondegenerate stimulated parametric down-conversion process. To properly account for the experiment, the detection process needs to be treated with time-dependent and continuous-mode operators because of the broadband nature of the parametric down-conversion process and the wide spectrum of the pump that we used. Here, we theoretically analyze the antinormally ordered intensity correlation of the continuous-mode fields by pursuing the detection process in the Heisenberg picture. It is shown that the excess positive correlation due to zero-point fluctuation reduces because of the frequency-distinguishability of the two emitted photon pairs.

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