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- Keyword
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- ARROW (1)
- Antiresonant reflecting optical waveguide (1)
- Birefringence (1)
- Design optimization (1)
- Discrete singular convolution (1)
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- Generalized differential quadrature (1)
- Mixed boundary condition (1)
- Mode control (1)
- Multitransverse mode (1)
- Non-uniform boundary condition (1)
- Optical polarization (1)
- Optical surface waves (1)
- Optical waveguides (1)
- Rectangular plates (1)
- SHB (1)
- Semiconductor laser modeling (1)
- Spatial hole burning (1)
- Surface emitting lasers (1)
- Surface waves (1)
- Thermal lensing (1)
- Thermal lensing effect (1)
- VCSELs (1)
- Vertical cavity surface emitting lasers (1)
- Vertical-cavity surface-emitting lasers (1)
- Vibration analysis (1)
- Waveguide lasers (1)
Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Chaos-Induced Escape Over A Potential Barrier, L. Y. Chew, Hian Ann, Christopher Ting, C. H. Lai
Chaos-Induced Escape Over A Potential Barrier, L. Y. Chew, Hian Ann, Christopher Ting, C. H. Lai
Research Collection Lee Kong Chian School Of Business
We investigate the statistical parity of a class of chaos-generated noises on the escape of strongly damped particles out of a potential well. We show that statistical asymmetry in the chaotic fluctuations can lead to a skewed Maxwell–Boltzmann distribution in the well. Depending on the direction of skew, the Kramers escape rate is enhanced or suppressed accordingly. Based on the Perron–Frobenious equation, we determine an analytical expression for the escape rate’s prefactor that accounts for this effect. Furthermore, our perturbative analysis proves that in the zeroth-order limit, the rate of particle escape converges to the Kramers rate.
Transverse-Leaky-Mode Characteristics Of Arrow Vcsels, Chyng Wen Tee, S. F. Yu, N. S. Chen
Transverse-Leaky-Mode Characteristics Of Arrow Vcsels, Chyng Wen Tee, S. F. Yu, N. S. Chen
Research Collection Lee Kong Chian School Of Business
Transverse-leaky-mode characteristics of antiresonant-reflecting-optical-waveguide (ARROW) vertical-cavity surface-emitting lasers (VCSELs) are studied. It is found that the suppression of high-order transverse leaky modes in ARROW VCSELs can be deteriorated by the influence of spatial hole burning and thermal lensing effects. On the other hand, a new design rule is proposed to deduce the optimum dimensions of ARROW so that the suppression of high-order transverse leaky modes can be enhanced. Furthermore, the turn-on transient response of ARROW VCSELs is investigated. It is found that the radiation loss has significant influence on the built-up time of the first-order transverse leaky mode.
Comparison Of Discrete Singular Convolution And Generalised Differential Quadrature For The Vibration Analysis Of Rectangular Plates, C. H. W. Ng, Yibao Zhao, G. W. Wei
Comparison Of Discrete Singular Convolution And Generalised Differential Quadrature For The Vibration Analysis Of Rectangular Plates, C. H. W. Ng, Yibao Zhao, G. W. Wei
Research Collection Lee Kong Chian School Of Business
This paper presents a comprehensive comparison study between the discrete singular convolution (DSC) and the well-known global method of generalized differential quadrature (GDQ) for vibration analysis so as to enhance the understanding of the DSC algorithm. The DSC method is implemented through Lagrange's delta sequence kernel (DSC-LK), which utilizes local Lagrange polynomials to calculate weighting coefficients, whereas, the GDQ requires global ones. Moreover, it is shown that the treatments of boundary conditions and the use of grid systems are different in the two methods. Comparison study is carried out on 21 rectangular plates of different combinations of simply supported (S), …
Suppression Of Polarization Switching In Birefringent Antiresonant Reflecting Optical Waveguide Vertical-Cavity Surface-Emitting Lasers, N. S. Chen, S. F. Yu, Chyng Wen Tee
Suppression Of Polarization Switching In Birefringent Antiresonant Reflecting Optical Waveguide Vertical-Cavity Surface-Emitting Lasers, N. S. Chen, S. F. Yu, Chyng Wen Tee
Research Collection Lee Kong Chian School Of Business
Influence of birefringence on the multimode operation of antiresonant reflecting optical waveguide (ARROW) vertical-cavity surface-emitting lasers (VCSELs) is analyzed. It can be shown that polarization switching is mainly due to thermal lensing effects. Hence, a new design rule is proposed to optimize the dimensions of ARROW for the suppression of polarization switching. Using the optimized design, the maximum single-polarization output power of VCSELs can be tripled. In addition, it is shown that the performance of the optimized ARROW VCSELs will not be deteriorated by the uncertainty of birefringence.
Parameter Selection In Genetic Algorithms, Onur Boyabatli, Ihsan Sabuncuoglu
Parameter Selection In Genetic Algorithms, Onur Boyabatli, Ihsan Sabuncuoglu
Research Collection Lee Kong Chian School Of Business
In this study, we provide a new taxonomy of parameters of genetic algorithms (GA), structural and numerical parameters, and analyze the effect of numerical parameters on the performance of GA based simulation optimization applications with experimental design techniques. Appropriate levels of each parameter are proposed for a particular problem domain. Controversial to existing literature on GA, our computational results reveal that in the case of a dominant set of decision variable the crossover operator does not have a significant impact on the performance measures, whereas high mutation rates are more suitable for GA applications.