Characterization of polarization-independent phase modulation method for practical plug and play quantum cryptography

Laser Physics ◽  
2015 ◽  
Vol 25 (12) ◽  
pp. 125201 ◽  
Author(s):  
Osung Kwon ◽  
Min-Soo Lee ◽  
Min Ki Woo ◽  
Byung Kwon Park ◽  
Il Young Kim ◽  
...  
Keyword(s):  
Quantum Cryptography ◽  
Phase Modulation ◽  
Modulation Method ◽  
Plug And Play ◽  
Polarization Independent

Characterization of a polarization-independent transmission trap detector

1997 ◽  
Vol 36 (13) ◽  
pp. 2807 ◽  
Author(s):  
Toomas Kübarsepp ◽  
Petri Kärhä ◽  
Erkki Ikonen
Keyword(s):  
Trap Detector ◽  
Polarization Independent

scholarly journals Polarization-independent 2 pi phase modulation for Terahertz using chiral nematic liquid crystals

2016 ◽  
Vol 6 (7) ◽  
pp. 2283 ◽  
Author(s):  
Chun-Ta Wang ◽  
Chung-Lun Wu ◽  
Han-Wei Zhang ◽  
Tsung-Hsien Lin ◽  
Chao-Kuei Lee
Keyword(s):  
Liquid Crystals ◽  
Phase Modulation ◽  
Nematic Liquid Crystals ◽  
Chiral Nematic ◽  
Polarization Independent

Epitaxial Growth and Characterization of Nonpolar A-Plane AlGaN-Based Multiple Quantum Wells

2018 ◽  
Vol 934 ◽  
pp. 8-12
Author(s):  
Jian Guo Zhao ◽  
Xiong Zhang ◽  
Jia Qi He ◽  
Shuai Chen ◽  
Zi Li Wu ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Chemical Vapor ◽  
Multiple Quantum Wells ◽  
Modulation Method ◽  
Duty Ratio ◽  
Organic Chemical ◽  
Multiple Quantum ◽  
X Ray Diffraction ◽  
Metal Organic

A serious of non-polar a-plane AlGaN-based multiple quantum wells (MQWs) were successfully grown on the semi-polar r-plane sapphire substrate with metal organic chemical vapor deposition technology. Intense MQWs-related emission peaks at an emission wavelength covered from 277-294 nm were observed based on the photoluminescence measurement. It was found that the employment of the trimethyl-aluminum (TMAl) flow duty-ratio modulation method which was developed based on the two-way pulsed-flows growth technique played a crucial role to control the Al composition of the non-polar a-plane AlGaN epi-layers. The non-polar a-plane AlGaN-based MQWs were deposited with the new developed TMAl flow duty-ratio modulation technique. Evident-3th order X-ray diffraction (XRD) satellite peak was observed from the high resolution-XRD measurement, proving the successful growth of non-polar a-plane AlGaN-based MQWs with abrupt hetero-interfaces.

scholarly journals Generation and Characterization of Mid-Infrared Supercontinuum in Bulk YAG Pumped by Femtosecond 1937 nm Pulses from a Regenerative Amplifier

2019 ◽  
Vol 9 (16) ◽  
pp. 3399 ◽  
Author(s):  
Seyed Ali Rezvani ◽  
Yutaka Nomura ◽  
Takao Fuji
Keyword(s):  
Pump Pulse ◽  
Phase Modulation ◽  
Cross Correlation ◽  
Seed Pulse ◽  
Regenerative Amplifier ◽  
Mid Infrared ◽  
Optical Gating ◽  
Full Characterization ◽  
Insight Into

We have demonstrated the generation of supercontinuum (SC) pulses in bulk, using femtosecond pulses directly derived from a Tm:YAP regenerative amplifier. The SC spans from 380 nm–4 μ m. Such an SC combined with the applied 1937-nm pump pulse can be used in a mid-infrared optical parametric amplifier (MIR-OPA). A full characterization of the phase and stability of the SC provides important insight into the performance of such MIR-OPA systems. Using cross-correlation frequency-resolved optical gating (XFROG), we characterized the properties of the MIR section of the SC that can be used as a seed pulse in an MIR-OPA system. The pulse-to-pulse instability rooted in the intrinsic properties of the self-phase modulation process was observed in the retrieved trace and spectrum of the SC. In addition, the effect of the pump pulse quality was studied on the obtainable SC pulses.

scholarly journals Experimental Study of a Signal Modulation Method to Improve eLORAN Data Channel Communications

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6504
Author(s):  
Chaozhong Yang ◽  
Yulin Wang ◽  
Shifeng Li ◽  
Wenhe Yan
Keyword(s):  
Phase Modulation ◽  
Service System ◽  
Modulation Method ◽  
Pulse Modulation ◽  
Digital Modulation ◽  
Typical Application ◽  
Time Service ◽  
Data Channel ◽  
Modulation Coding ◽  
Modulation Methods

There are mainly two types of data modulation methods used for enhanced LOng-RAnge Navigation (eLORAN) systems: pulse position modulation (PPM) and supernumerary interpulse modulation (SIM). The typical application for PPM is tri-state PPM (3S-PPM), also known as Eurofix. The typical application for SIM is ninth pulse modulation. Both of these methods are phase modulation methods. Phase modulation coding, a very mature technology, is used at present. To achieve a better demodulation success rate of eLORAN digital modulation signals at longer distances, a method of using the transmitting station duplex mode to transmit a digital modulation pulse group after LORAN-C transmitting a pulse group is proposed to realize modulation pulse on–off modulation. In this method, a broadcasting experiment was performed on the BPL (The call sign of eLORAN time service system in China) broadcaster station. After monitoring, a good receiving demodulation effect was initially obtained.

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