Simultaneous OSNR Monitoring and Modulation Format Identification Using Asynchronous Single Channel Sampling

2015 ◽  
Author(s):  
Faisal Nadeem Khan ◽  
Yi Yu ◽  
Ming Chieng Tan ◽  
Changyuan Yu ◽  
Alan Pak Tao Lau ◽  
...  
Keyword(s):  
Single Channel ◽  
Modulation Format

400-Gb/s Modulation-Format-Independent Single-Channel Transmission With Chromatic Dispersion Precompensation Based on OAWG

2010 ◽  
Vol 22 (12) ◽  
pp. 905-907 ◽  
Author(s):  
David J. Geisler ◽  
Nicolas K. Fontaine ◽  
Ryan P. Scott ◽  
Tingting He ◽  
Loukas Paraschis ◽  
...  
Keyword(s):  
Single Channel ◽  
Chromatic Dispersion ◽  
Modulation Format

INFLUENCE OF EXTINCTION RATIO ON THE PERFORMANCE OF RZ-ODPASK MODULATION FORMAT

2009 ◽  
Vol 23 (11) ◽  
pp. 2479-2489
Author(s):  
XIAOJUN LI ◽  
AIJUN WEN ◽  
ZENGJI LIU ◽  
TAO SHANG
Keyword(s):  
Single Channel ◽  
Chromatic Dispersion ◽  
Extinction Ratio ◽  
Optical Fields ◽  
Analytical Methodology ◽  
Modulation Formats ◽  
Modulation Format ◽  
Fiber Nonlinearity ◽  
Shift Keying ◽  
Phase Amplitude

The influence of extinction ratio (ER) on the performance of 120 Gbps return-to-zero octal differential phase-amplitude-shift keying (RZ-ODPASK) modulation format in single-channel transmission is investigated. Based on the modulation and demodulation schemes, the structures of RZ-ODPASK transmitter and receiver are presented; and expressions for the output optical fields and electrical currents of amplitude and phase tributaries are analytically acquired. As ER is a tradeoff for good performance of the two tributaries, the optimal ER for back-to-back configuration is theoretically derived as 2.32 dB for the first time, which is verified by simulation. Then the tolerances to residual chromatic dispersion (CD) and fiber nonlinearity of RZ-ODPASK transmission are numerically studied, respectively. The results indicate that phase tributary is more robust against both dispersion and nonlinearity impairment than the amplitude tributary. To balance the performance of the two tributaries, curves of the optimal ER values with the change of residual CD and fiber nonlinearity are also obtained, respectively. The results can be useful for the design of RZ-ODPASK systems; in the meantime, the analytical methodology described in this paper is applicable to other multilevel RZ-DPASK modulation formats.

scholarly journals Experimental demonstration of joint OSNR monitoring and modulation format identification using asynchronous single channel sampling

2015 ◽  
Vol 23 (23) ◽  
pp. 30337 ◽  
Author(s):  
Faisal Nadeem Khan ◽  
Yi Yu ◽  
Ming Chieng Tan ◽  
Waled Hussein Al-Arashi ◽  
Changyuan Yu ◽  
...  
Keyword(s):  
Single Channel ◽  
Experimental Demonstration ◽  
Modulation Format

Modulation format and baud-rate identification using asynchronous single channel sampling based on CNN

2020 ◽  
Vol 463 ◽  
pp. 125363
Author(s):  
Jie Gao ◽  
Xian Zhou ◽  
Qirui Fan ◽  
Dongxu Lu ◽  
Jiahao Huo ◽  
...  
Keyword(s):  
Single Channel ◽  
Baud Rate ◽  
Modulation Format

scholarly journals Numerical comparison between DPSK 33, DPSK 66 and duo binary in WOC system

2021 ◽  
Vol 23 (1) ◽  
pp. 247
Author(s):  
Mustafa H. Ali ◽  
Hazim M. Ali ◽  
Tariq A. Hassan
Keyword(s):  
Single Channel ◽  
Superior Performance ◽  
Duty Ratio ◽  
Numerical Comparison ◽  
Q Factor ◽  
Small Aperture ◽  
Modulation Formats ◽  
Great Loss ◽  
Aperture Diameter ◽  
Modulation Format

OWC systems have turned into a state-of-the-art technology because of their superior performance uniqueness and its innumerable characteristic as compared to its RF. One of the OWC application is inter-satellite wireless optical communication (Is-WOC), this framework can be improved by using different ways such as advanced modulation formats and aperture diameter. We demonstrate an analysis based on the aperture diameter effect in transmission of single channel with 40 Gb/s Is-WOC system using three different modulation methods, differential phase-shift keying (DPSK) with a duty ratio to 66% and 33% and duobinary. Choosing these three modulations from various modulation format is done depending on the advantage they provide where the DPSK gives to fiber nonlinearity a powerful robustness and less susceptible to SPM and XPM and for system requirements of dispersion compensation in duobinary, it provides higher chromatic dispersion tolerance mitigate. The result shows the effect of different transmitter aperture diameter (from 2 to 20 cm) for a constant distance 200 km accomplished by quality factor and minimum BER. We conclude there is a great loss in the small aperture diameter, even in the presence of best modulation format, therefore as the aperture diameter increase the Q-factor increase, but some increased rise is linear and the other is changing from linear to non-linear in a fixed Q-factor point equal to 5.63.

Data Acquisition and Handling Unit for a Quantitative Use of Electron Energy Loss Spectroscopy

1977 ◽  
Vol 35 ◽  
pp. 232-233 ◽  
Author(s):  
P. Trebbia ◽  
P. Ballongue ◽  
C. Colliex
Keyword(s):  
Electron Microscope ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Single Channel ◽  
Detection System ◽  
Surface Barrier ◽  
Solid State Detector ◽  
Electrostatic Mirror ◽  
Electron Energy Loss

An effective use of electron energy loss spectroscopy for chemical characterization of selected areas in the electron microscope can only be achieved with the development of quantitative measurements capabilities.The experimental assembly, which is sketched in Fig.l, has therefore been carried out. It comprises four main elements.The analytical transmission electron microscope is a conventional microscope fitted with a Castaing and Henry dispersive unit (magnetic prism and electrostatic mirror). Recent modifications include the improvement of the vacuum in the specimen chamber (below 10-6 torr) and the adaptation of a new electrostatic mirror.The detection system, similar to the one described by Hermann et al (1), is located in a separate chamber below the fluorescent screen which visualizes the energy loss spectrum. Variable apertures select the electrons, which have lost an energy AE within an energy window smaller than 1 eV, in front of a surface barrier solid state detector RTC BPY 52 100 S.Q. The saw tooth signal delivered by a charge sensitive preamplifier (decay time of 5.10-5 S) is amplified, shaped into a gaussian profile through an active filter and counted by a single channel analyser.

Instrumentation for Measurement of Lingual Strength

1968 ◽  
Vol 11 (1) ◽  
pp. 189-193 ◽  
Author(s):  
Lois Joan Sanders
Keyword(s):  
Single Channel ◽  
Displacement Transducer ◽  
Tongue Pressure ◽  
Maximum Pressure ◽  
Research Use ◽  
Direct Writing ◽  
Significant Difference ◽  
Pressure Unit ◽  
Force Displacement ◽  
Consistent Response

A tongue pressure unit for measurement of lingual strength and patterns of tongue pressure is described. It consists of a force displacement transducer, a single channel, direct writing recording system, and a specially designed tongue pressure disk, head stabilizer, and pressure unit holder. Calibration with known weights indicated an essentially linear and consistent response. An evaluation of subject reliability in which 17 young adults were tested on two occasions revealed no significant difference in maximum pressure exerted during the two test trials. Suggestions for clinical and research use of the instrumentation are noted.

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