The use of the downhill Simplex algorithm in reconstruction of optical parameters of planar silica waveguides is described. The original Nelder-Mead approach has been modified to include physical constraints of the waveguide system. Numerical results are provided to illustrate the behavior of the modified algorithm.
We provide results of the theoretical analysis of guided lateral mode in broad-area (BA) semiconductor lasers with modal reflectors formed by patterning the reflectivity of the front facet. The analysis has been performed by using a simple model based on the effective index method and the concept of the effective facet reflectivity. The numerical results include mode threshold conditions and far-field patterns of the lasing modes for various reflector configurations.
This paper is devoted to the theoretical analysis of the modal properties of planar antiresonant reflecting optical waveguides (ARROWs) with graded-index core layers. It is shown, that the presence of antiresonant cladding layers beneath the core results in reduction of the number of guided modes, which enables the single-mode operation of the waveguides with thicker cores. Spatial properties of the modes are also investigated with emphasis on the variation of field profiles with the parameters of the cladding layers. The analysis is restricted to the lossless planar ARROW configuration and bound ARROW modes.
This paper provides a detailed theoretical analysis of the refractive index sensitivity of antiresonant reflecting optical waveguides (ARROW's). The ARROW loss characteristics are determined by the interference effects in the cladding Fabry-Perot cavities and by the reflection phenomena at the interface between the cladding layers. Both mechanisms are described in detail and the significance of each of them is discussed for various waveguide parameters.
We propose a new approach to the intensity modulation in antiresonant reflecting optical waveguides. The proposed mechanism involves a variation of the reflectivity of the interface between the cladding layers, obtained by providing a small refractive index difference between the core and the second cladding layer.
The transfer matrix method is employed to analyze the modal propagation within antiresonant reflecting optical waveguides (ARROW) implemented in InP/InGaAsP multilayer planar structures. The analysis provides an accurate picture of dispersion and attenuation of TE polarized waves at the operational wavelength of 1. 55 pm. The numerical results show the optimum values of system parameters for low loss operation and may be useful for designing various optoelectronic devices such as semiconductor lasers or optical amplifiers monolithically integrated with low loss passive ARROW guides which are suitable for coupling to external elements e. g. to optical fibers.
The transfer matrix method is employed to analyze the propagation of leaky waves within planar multiple quantum well (MQW) waveguides implemented in the GaAs/AlGaAs material system and formed on GaAs substrates. The analysis provides an accurate picture of attenuation of both TE and TM polarized waves at the operational wavelength of 1.15 micrometers . Particular attention has been drawn to the variation of the loss coefficient as a function of parameters of the AlGaAs buffer layer separating the MQW core and the high index GaAs substrate.
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