scholarly journals Analysis of Wavelength Sensitivity of Coupling Coefficients and Inter-core Crosstalk in a 9 core Multi-core Fiber

2021 ◽  
Author(s):  
Afzal Hossain ◽  
Satya Prasad Majumder
Keyword(s):  
Propagation Distance ◽  
Wavelength Dependence ◽  
Coupled Mode Theory ◽  
Coupling Coefficients ◽  
Propagation Length ◽  
Coupled Mode ◽  
Wavelength Sensitivity ◽  
The Mean ◽  
Core Fiber ◽  
Core Pitch

Abstract Wavelength dependence of coupling coefficients and inter-core crosstalk in a 9-core homogeneous multi-core optical fiber (MCF) are investigated analytically. The analysis is further extended to evaluate the mean crosstalk power at the output of any core with light launched into other core of the MCF. Propagation length dependence of mean crosstalk power is investigated using both coupled mode theory (CMT) and coupled power theory (CPT). CPT based results show that mean crosstalk power linearly dependent on propagation distance, and it is higher for higher values of coupling coefficient. On the other hand, the mean crosstalk power is found to oscillate with the propagation distance in case of CMT. It is also observed that the mean crosstalk power (dB) is more prominent at a lower wavelength for a given propagation distance. The behavour of relative crosstalk power is also investigated analytically where it is noticed that the relative crosstalk power increases almost linearly with core pitch and with wavelength. It is also seen that the relative crosstalk power (dB) is more in an MCF with lower number of cores when it is varied with respect to wavelength. This is due to the increase of core pitch under the same cladding diameter and cladding thickness limitations.

scholarly journals Multi-core fiber design and analysis: coupled-mode theory and coupled-power theory

2011 ◽  
Vol 19 (26) ◽  
pp. B102 ◽  
Author(s):  
Masanori Koshiba ◽  
Kunimasa Saitoh ◽  
Katsuhiro Takenaga ◽  
Shoichiro Matsuo
Keyword(s):  
Coupled Mode Theory ◽  
Power Theory ◽  
Mode Theory ◽  
Coupled Mode ◽  
Fiber Design ◽  
Core Fiber

scholarly journals Performance Enhancement in Multicore Fiber Using Trench Assisted Technique

2021 ◽  
Author(s):  
Salma Fatmia ◽  
Manimegalai CT ◽  
Sabitha Gauni ◽  
K. Kalimuthu
Keyword(s):  
Performance Enhancement ◽  
Single Mode ◽  
Design Parameters ◽  
Coupled Mode Theory ◽  
Coupled Mode ◽  
Bending Radius ◽  
Pitch Bending ◽  
Multicore Fiber ◽  
Core Pitch ◽  
Trench Width

Abstract Analysis of crosstalk in multicore fiber using trench assisted technique. To reduce the crosstalk between the cores in the fiber the coupled mode theory and coupled power theory are adopted for crosstalk estimation and considering different design parameters such as core pitch, bending radius and wavelength to optimize the crosstalk performance. The homogeneous fiber which works under single mode operation has been considered. The study of performance by varying the trench width is also analysed. Crosstalk variation in outer cores and center core of the fiber is studied. And the study of variation of crosstalk with 5 different core radius has been done. The numerical simulation results of crosstalk behavior over bending radius, wavelength and trench width is obtained.

Study on Coupling Coefficient and Fabrication of a Kind of Symmetric Twin-Core Silica Fiber

2010 ◽  
Vol 439-440 ◽  
pp. 1404-1408
Author(s):  
Jian Peng ◽  
Li Song Liu ◽  
Lei Yao ◽  
Shui Sheng Jian
Keyword(s):  
Coupling Coefficient ◽  
Coupled Mode Theory ◽  
Relative Refractive Index ◽  
Improved Method ◽  
Core Diameter ◽  
Coupled Mode ◽  
The Core ◽  
Measurement Results ◽  
Refractive Index Difference ◽  
Core Fiber

The coupling coefficient of twin-core fiber is discussed with coupled-mode theory in this paper. It shows that the coupling coefficient is related with the pump wavelength, the core diameter, the distance between the centers of the two cores and the relative refractive index difference. And the parameters of the twin-core fibers can be optimized to satisfy different requirements. Using the theory, the twin-core fibers are fabricated by an improved method. The measurement results have an obvious progress than previous work.

Hybrid modes of the passive-core corrugated-waveguide laser

1976 ◽  
Vol 54 (8) ◽  
pp. 849-860 ◽  
Author(s):  
R. I. MacDonald ◽  
K. O. Hill ◽  
V. Makios
Keyword(s):  
Coupled Mode Theory ◽  
Coupling Coefficients ◽  
Waveguide Laser ◽  
Corrugated Waveguide ◽  
Mode Theory ◽  
Coupled Mode ◽  
Leaky Modes ◽  
Loss Coefficients ◽  
Corrugated Structure ◽  
Oscillation Frequencies

Coupled-mode theory is employed to obtain the threshold gains for oscillation on hybrid modes of a passive-core corrugated-waveguide laser pumped in a central portion of its length. Methods are developed for calculating intermode coupling coefficients and loss coefficients resulting from diffraction into any order of waveguide corrugations of arbitrary shape. Experimental observations that have been reported in the literature are compared with the hybrid-mode threshold gains computed from coupled-mode theory. It is shown that the oscillation frequencies for such a laser are determined by the length of the corrugated structure, the proportion that is pumped, and the effects of coupling into leaky modes.

scholarly journals Computation of optical waveguide interaction for quantum gates implementation

2021 ◽  
Vol 2086 (1) ◽  
pp. 012153
Author(s):  
A A Lytaev ◽  
I Yu Popov
Keyword(s):  
Optical Waveguide ◽  
Quantum Gates ◽  
Coupled Mode Theory ◽  
Coupling Coefficients ◽  
Dual Mode ◽  
Mode Theory ◽  
Coupled Mode ◽  
Control Switch

Abstract The system of two coupled optical dual-mode waveguides is considered. The coupling of the system is studied to find a circuit for building a control switch for two qubit gates. The classical coupled mode theory is applied and the exact expressions for coupling coefficients are derived. The parameters of the system for performing the desired operations are numerically computed and analysed. The system describing the influence of intermodal interactions is solved numerically. The distortions are analysed.

Kinetic theory of three-wave interaction in a magnetied plasma

1970 ◽  
Vol 4 (3) ◽  
pp. 585-593 ◽  
Author(s):  
L. Stenflo
Keyword(s):  
Magnetic Field ◽  
Kinetic Theory ◽  
Constant Magnetic Field ◽  
Wave Interaction ◽  
Resonant Interaction ◽  
Coupled Mode Theory ◽  
Coupling Coefficients ◽  
Kinetic Description ◽  
Homogeneous Plasma ◽  
Coupled Mode

This paper considers the non-linear resonant interaction between three waves, which propagate in the direction of a constant magnetic field in a homogeneous plasma. A coupled-mode theory, which makes it possible to derive the coupling coefficients within a kinetic description, is developed.

Comparative crosstalk performance analysis of different configurations of heterogeneous multicore fiber

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Umar Farooque ◽  
Rakesh Ranjan
Keyword(s):  
Refractive Index ◽  
Mode Coupling ◽  
The Other ◽  
Heterogeneous Multicore ◽  
Coupled Mode ◽  
The Core ◽  
Bending Radius ◽  
Multicore Fiber ◽  
The Impact ◽  
Core Pitch

AbstractIn order to select the heterogeneous multicore fiber (MCF) configuration with ultra-low crosstalk and low peak bending radius, comparative crosstalk analysis have been done for the three possible core configurations, namely, Configuration 1 - different refractive index (R.I.) and different radius, Configuration 2 - different R.I., and Configuration 3 - different radius. Using the coupled mode equation and the simplified expressions of mode coupling coefficient (MCC) for different configurations of heterogeneous cores, the crosstalk performance of all the heterogeneous MCF configurations along with the homogeneous MCF have been investigated analytically with respect to core pitch (D) and fiber bending radius (${R}_{b}$). Further, these expressions of MCC have been extended to obtain the simplified expressions of MCC for the estimation of crosstalk levels in respective trench-assisted (TA) heterogeneous MCF configurations. It is observed from the analysis that in Configuration 1, crosstalk level is lowest and the rate of decrease in the crosstalk with respect to the core pitch is highest compared to the other configurations of heterogeneous MCF. The values of crosstalk obtained analytically have been validated by comparing it with the values obtained from finite element method (FEM) based numerical simulation results. Further, we have investigated the impact of a fixed percent change (5%) in the core parameters (radius and/or R.I.) of one of the core of a homogeneous MCF, to realize the different heterogeneous MCF configurations, on the variations in crosstalk levels, difference in the mode effective refractive index of the core 1 and core 2 ($\Delta {n}_{eff}={n}_{eff1}-{n}_{eff2}$), and the peak bending radius (${R}_{pk}$). For the same percent variations (5%) in the core parameters (radius and/or R.I.) of different configurations of cores (Config. 1-Config. 3), Config. 1 MCF has highest variation in $\Delta {n}_{eff}$ value compared to other configurations of MCF. Further, this highest variation in $\Delta {n}_{eff}$ value of Config. 1 MCF results in smallest peak bending radius. The smaller value of peak bending radius allows MCF to bend into smaller radius. Therefore, Configuration 1 is the potential choice for the design of MCF with smaller peak bending radius and ultra-low crosstalk level compared to the other configurations of SI-heterogeneous MCF.

scholarly journals Biosensing Near the Exceptional Point Based on Resonant Optical Tunneling Effect

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 426
Author(s):  
Yang Liu ◽  
Pengyun Yan ◽  
Feng Liu ◽  
Aoqun Jian ◽  
Shengbo Sang
Keyword(s):  
Exceptional Point ◽  
Tunneling Effect ◽  
Coupled Mode Theory ◽  
Environment Protection ◽  
Label Free ◽  
Liquid Sample ◽  
Water Safety ◽  
Coupled Mode ◽  
Drinking Water Safety ◽  
Optical Tunneling

Inspired by exceptional point (EP) sensing in non-Hermitian systems, in this work, a label-free biosensor for detecting low-concentration analytes is proposed, via a special multilayer structure: a resonant optical tunneling resonator. Due to the square root topology near the exceptional point, a recognized target analyte perturbs the system deviated from the exceptional point, leading to resolvable modes splitting in the transmission spectrum. The performance of the designed sensor is analyzed by the coupled-mode theory and transfer matrix method, separately. Here, the simulation results demonstrate that the obtained sensitivity is 17,120 nm/imaginary part unit of refractive index (IP) and the theoretical detection limit is 4.2 × 10−8 IP (regarding carcinoembryonic antigen (CEA), the minimum detection value is 1.78 ng). Instead of the typical diffusion manner, the liquid sample is loaded by convection, which can considerably improve the efficiency of sample capture and shorten the response time of the sensor. The sketched sensor may find potential application in the fields of biomedical detection, environment protection, and drinking water safety.

scholarly journals Correlation and Power Distribution of Intercore Crosstalk Field Components of Polarization-Coupled Weakly Coupled Single-Mode Multicore Fibres

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 191
Author(s):  
José A. P. Morgado ◽  
Adolfo V. T. Cartaxo
Keyword(s):  
Power Distribution ◽  
Communication Systems ◽  
Single Mode ◽  
Coupled Mode ◽  
Weakly Coupled ◽  
Wide Range ◽  
Optical Communication Systems ◽  
The Mean ◽  
Distribution Of Power ◽  
Linear Propagation

The correlation and power distribution of intercore crosstalk (ICXT) field components of weakly coupled multicore fibers (WC-MCFs) are important properties that determine the statistics of the ICXT and ultimately impact the performance of WC-MCF optical communication systems. Using intensive numerical simulation of the coupled mode equations describing ICXT of a single-mode WC-MCF with intracore birefringence and linear propagation, we assess the mean, correlation, and power distribution of the four ICXT field components of unmodulated polarization-coupled homogeneous and quasi-homogeneous WC-MCFs with a single interfering core in a wide range of birefringence conditions and power distribution among the field components at the interfering core input. It is shown that, for homogeneous and quasi-homogeneous WC-MCFs, zero mean uncorrelated ICXT field components with similar power levels are observed for birefringence correlation length and birefringence beat length in the ranges of 0.5m,10m and 0.1m,10m, respectively, regardless of the distribution of power between the four field components at the interfering core input.

Sign in / Sign up

Export Citation Format

Share Document