IMPACT OF INPUT PULSE SHAPE IN THE OUTPUT OF OPTICAL DEVICE IN THE PRESENCE OF INTERFERENCE AND SECOND ORDER DISPERSION

2021 ◽  
Vol 16 (3) ◽  
pp. 17
Author(s):  
S. SANKAR ◽  
M. N. SARAVANA KUMAR ◽  
◽  
Keyword(s):  
Pulse Shape ◽  
Input Pulse ◽  
Second Order ◽  
Optical Device ◽  
Order Dispersion

An Analytic Formulation of PMD-Induced Pulse Distortion

2015 ◽  
Vol 36 (4) ◽  
Author(s):  
Witold Bardyszewski ◽  
Michael Reimer ◽  
David Yevick
Keyword(s):  
Pulse Shape ◽  
Error Probability ◽  
Input Pulse ◽  
Polarization Mode Dispersion ◽  
Second Order ◽  
Mode Dispersion ◽  
Pulse Distortion ◽  
Order Expansion ◽  
Analytic Expression

AbstractWe systematically analyze the pulse distortion resulting from polarization mode dispersion (PMD) by deriving an analytic expression for the characteristic function of the system bit error probability (BEP) density in terms of the lowest-order moments of the Fourier transformed input pulse shape. We determine the range of validity of our technique, which implements a second-order expansion of the Jones matrix, by comparing our results for chirped and unchirped input pulses with direct numerical simulations. Our method may be easily applied to analyze the role of the first- and second-order PMD in the interference between adjacent pulses.

scholarly journals Time and Frequency Localized Pulse Shape for Resolution Enhancement in STFT-BOTDR

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Linqing Luo ◽  
Bo Li ◽  
Yifei Yu ◽  
Xiaomin Xu ◽  
Kenichi Soga ◽  
...  
Keyword(s):  
Pulse Shape ◽  
Signal To Noise Ratio ◽  
Resolution Enhancement ◽  
Input Pulse ◽  
Rectangular Pulse ◽  
Time Domain Reflectometry ◽  
Frequency Resolution ◽  
Gaussian Shape ◽  
Time Frequency ◽  
New Research

Short-Time Fourier Transform-Brillouin Optical Time-Domain Reflectometry (STFT-BOTDR) implements STFT over the full frequency spectrum to measure the distributed temperature and strain along the optic fiber, providing new research advances in dynamic distributed sensing. The spatial and frequency resolution of the dynamic sensing are limited by the Signal to Noise Ratio (SNR) and the Time-Frequency (T-F) localization of the input pulse shape.T-Flocalization is fundamentally important for the communication system, which suppresses interchannel interference (ICI) and intersymbol interference (ISI) to improve the transmission quality in multicarrier modulation (MCM). This paper demonstrates that theT-Flocalized input pulse shape can enhance the SNR and the spatial and frequency resolution in STFT-BOTDR. Simulation and experiments ofT-Flocalized different pulses shapes are conducted to compare the limitation of the system resolution. The result indicates that rectangular pulse should be selected to optimize the spatial resolution and Lorentzian pulse could be chosen to optimize the frequency resolution, while Gaussian shape pulse can be used in general applications for its balanced performance in both spatial and frequency resolution. Meanwhile,T-Flocalization is proved to be useful in the pulse shape selection for system resolution optimization.

Large Signal Analysis of FM-AM Conversion in Dispersive Optical Fibers for PCM Systems Including Second Order Dispersion

2002 ◽  
Vol 21 (3) ◽  
pp. 193-203 ◽  
Author(s):  
R. S. Kaler ◽  
T. S. Kamal ◽  
Ajay K. Sharma ◽  
Sandeep K. Arya ◽  
R. A. Agarwala
Keyword(s):  
Optical Fibers ◽  
Signal Analysis ◽  
Second Order ◽  
Large Signal ◽  
Order Dispersion

Second-order dispersion interactions in π-conjugated polymers

2011 ◽  
Vol 134 (23) ◽  
pp. 234101 ◽  
Author(s):  
William Barford ◽  
Nattapong Paiboonvorachat ◽  
David Yaron
Keyword(s):  
Conjugated Polymers ◽  
Second Order ◽  
Dispersion Interactions ◽  
Order Dispersion

scholarly journals Simplified Tuning of Long-Range Corrected Density Functionals for Use in Symmetry-Adapted Perturbation Theory

2021 ◽  
Author(s):  
Montgomery Gray ◽  
John Herbert
Keyword(s):  
Perturbation Theory ◽  
Asymptotic Behavior ◽  
Long Range ◽  
System Size ◽  
Second Order ◽  
Density Functionals ◽  
Hole Making ◽  
Large Systems ◽  
Automated Tuning ◽  
Order Dispersion

Long considered a failure, second-order symmetry-adapted perturbation theory (SAPT) based on Kohn-Sham orbitals, or SAPT(KS), can been resurrected for semiquantitative purposes using long-range corrected (LRC) density functionals whose asymptotic behavior is adjusted separately for each monomer. As in other contexts, correct asymptotic behavior can be enforced via "optimal tuning" of LRC functionals, based on the ionization energy theorem, but the tuning procedure is tedious, expensive for large systems, and comes with a troubling dependence on system size. Here, we show that essentially identical results are obtained using an automated tuning procedure based on the size of the exchange hole, making tuned "SAPT(wKS)" fast and convenient. In conjunction with SAPT-based methods that sidestep second-order dispersion, this procedure achieves benchmark-quality interaction energies, along with the usual SAPT energy decomposition, without the hassle of system-specific tuning.

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