Chromatic dispersion monitoring in optical systems

2016 ◽  
Author(s):  
T. Shanthi Priya ◽  
I. Muthumani
Keyword(s):  
Chromatic Dispersion ◽  
Optical Systems

scholarly journals Data-Aided Chromatic Dispersion Estimation for Polarization Multiplexed Optical Systems

2012 ◽  
Vol 4 (5) ◽  
pp. 2037-2049 ◽  
Author(s):  
C. C. Do ◽  
A. V. Tran ◽  
Chen Zhu ◽  
Simin Chen ◽  
T. Anderson ◽  
...  
Keyword(s):  
Chromatic Dispersion ◽  
Optical Systems

scholarly journals Global Estimation and Compensation of Linear Effects in Coherent Optical Systems based on Nonlinear Least Squares

2021 ◽  
Author(s):  
Alexandru Frunza ◽  
Vincent Choqueuse ◽  
Pascal Morel ◽  
Stéphane Azou
Keyword(s):  
Least Squares ◽  
Carrier Frequency Offset ◽  
Chromatic Dispersion ◽  
Nonlinear Least Squares ◽  
Digital Signal ◽  
Optical Systems ◽  
Computational Time ◽  
Iq Imbalance ◽  
Linear Effects ◽  
Compensation Approach

This paper proposes a new estimation and compensation approach to mitigate several linear and widely linear effects in coherent optical systems using digital signal processing (DSP) algorithms. Compared to most of the available strategies that employ local estimation and/or compensation algorithms, this approach performs a global impairments estimation and compensation based on Nonlinear Least Squares. The proposed method estimates and compensates for the chromatic dispersion (CD), carrier frequency offset (CFO), in-phase/quadrature (IQ) imbalance, and laser phase noise (PN) in two steps. Firstly, it estimates the quasi-static parameters related to the CD, CFO, and both transmitter and receiver IQ imbalance. Secondly, it estimates both transmitter and receiver lasers’ phases and compensates for all the imperfections by using a Zero-Forcing (ZF) equalizer. Simulations show the effectiveness of the approach in terms of statistical performance and computational time. The estimation performance is assessed by computing the Cramér Rao Lower Bound (CRLB), while the detection performance is compared to a modified Clairvoyant equalizer.<br>

scholarly journals A review of dielectric optical metasurfaces for wavefront control

Nanophotonics ◽  
2018 ◽  
Vol 7 (6) ◽  
pp. 1041-1068 ◽  
Author(s):  
Seyedeh Mahsa Kamali ◽  
Ehsan Arbabi ◽  
Amir Arbabi ◽  
Andrei Faraon
Keyword(s):  
High Efficiency ◽  
Chromatic Dispersion ◽  
Phase Control ◽  
Diffractive Optics ◽  
Optical Systems ◽  
Optical Elements ◽  
Wavefront Control ◽  
The Past ◽  
Recent Developments ◽  
Dielectric Structures

AbstractDuring the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here, we review some of these recent developments, with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then, we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome.

A New Design of Photonic Crystal Fiber with Fattened Dispersion and Low Effective Mode Area

2012 ◽  
Vol 535-537 ◽  
pp. 1304-1307
Author(s):  
Di Li ◽  
Qiang Xu ◽  
Du Qi Yuan ◽  
Xu Chao Duan
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chromatic Dispersion ◽  
Optical Systems ◽  
Perfectly Matched Layers ◽  
Nonlinearity Coefficient ◽  
Crystal Fiber ◽  
Dispersion Compensator ◽  
Effective Mode Area ◽  
Mode Area

We propose a novel type of photonic crystal fiber with low fattened dispersion and high nonlinearity for four wave mixing. The dispersion and nonlinearity coefficient are investigated simultaneously by using the full vectorial finite element method with anisotropic perfectly matched layers. The optimized result has been obtained by adjusting the design parameter of the proposed fiber, which has dispersion is -1.53 ps•nm−1 km−1 at wavelength of 1.55μm, and in addition the relatively small effective mode area of 2.23μm2 is obtained at the same wavelength, which will induce higher nonlinearity coefficient is close 54.8 W-1• km-1 at the wavelength of 1.55μm. The proposed PCF is suitable for applications as a chromatic dispersion controller, dispersion compensator, or as candidate for the nonlinear optical systems because of its small effective mode area.

scholarly journals Analysis and Compensation of Chromatic Dispersion in Long-hauls Optical Coherent System

2021 ◽  
Author(s):  
Narimane Hadjadji ◽  
Rachid Hamdi
Keyword(s):  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Optical Systems ◽  
Coherent System ◽  
Phase Shift Keying ◽  
Transmission Distance ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Simulation Results ◽  
Electronic Dispersion

In this paper, we demonstrate the efficiency of Electronic Dispersion Compensation (EDC) for coherent optical systems based on Polarization Division Multiplexed Quadrature Phase Shift Keying (PDM-QPSK). The performance of the proposed system is tested using a pulse that has been recently used in the presence of nonlinear effects.The proposed system is compared to the 0.3RZ-PDM-QPSK system at the optimum launched power under different symbol-rates and lengths of transmission. The simulation results confirm that the proposed method enhances the system performance. In addition, it secures a low penalty that is below 0.6 dB. As a result, the feasible transmission distance is improved by 29 %, 20.15 %, and 26.7 %, at 14 GBaud, 28 Gbaud, and 56 Gbaud, respectively.

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