{"product_id":"bragg-gratings-in-semiconductor-waveguides-von-stephan-pachnicke","title":"Bragg gratings in semiconductor waveguides","description":"\u003cp\u003eMaster's Thesis from the year 2001 in the subject Electrotechnology, grade: with distinction, City University London, language: English, abstract: Bragg gratings are important devices for both optical communications and\u003c\/p\u003e\u003cp\u003esensing. These devices are used to design very narrow band optical filters, which can\u003c\/p\u003e\u003cp\u003ebe used in wavelength division multiplexing (WDM). It is also perceived that Bragg\u003c\/p\u003e\u003cp\u003egratings will be used to compensate the dispersion in modern fibre optic\u003c\/p\u003e\u003cp\u003etelecommunication networks. Semiconductor gratings are usually integrated into\u003c\/p\u003e\u003cp\u003elasers to control the operating wavelength.\u003c\/p\u003e\u003cp\u003eCity University Photonic Modelling Group is a world leading research group on\u003c\/p\u003e\u003cp\u003ethe use of rigorous numerical techniques to design and optimise advanced photonic\u003c\/p\u003e\u003cp\u003edevices for optical communications. The research group has already achieved results\u003c\/p\u003e\u003cp\u003eon hypothetical one-dimensional (1-D) and realistic two-dimensional (2-D)\u003c\/p\u003e\u003cp\u003estructures. In this project a combination of three numerical methods has been used,\u003c\/p\u003e\u003cp\u003eall of which are rigorous, to simulate realistic three-dimensional (3-D) structures in\u003c\/p\u003e\u003cp\u003esemiconductor waveguides. The combination of these three accurate methods, the\u003c\/p\u003e\u003cp\u003efinite element method (FEM), the least squares boundary residual (LSBR) method\u003c\/p\u003e\u003cp\u003eand the transfer matrix method (TMM) turned out to be superior to the widely used\u003c\/p\u003e\u003cp\u003ecoupled mode theory (CMT).\u003c\/p\u003e\u003cp\u003eThe numerical study of different Bragg gratings shows interesting dependencies\u003c\/p\u003e\u003cp\u003eof the characteristics of the gratings on the different design parameters. The work\u003c\/p\u003e\u003cp\u003ewas carried out for different mesh distributions, different numbers of mesh divisions\u003c\/p\u003e\u003cp\u003eand different computational parameters. Another focus of the work was on the\u003c\/p\u003e\u003cp\u003estability of the transmission and reflection coefficients obtained from the LSBR\u003c\/p\u003e\u003cp\u003eprogram. Furthermore the effect of inaccuracy occurring during the fabrication\u003c\/p\u003e\u003cp\u003eprocess has been studied.\u003c\/p\u003e\u003cp\u003eThe results of this work have been compared to results found by other groups and\u003c\/p\u003e\u003cp\u003efellows. We can say that this project is quite new in the field of reflection spectrum\u003c\/p\u003e\u003cp\u003ecomputation of realistic 3-D semiconductor Bragg gratings. Up to now only a few\u003c\/p\u003e\u003cp\u003epapers have been published on such 3-D semiconductor gratings.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783638708784\"\u003e\u003ch3\u003e\u003c\/h3\u003e\u003c\/div\u003e","brand":"Libri","offers":[{"title":"Softcover - 9783638708784","offer_id":39438829879389,"sku":"9783638708784","price":47.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/8c4a00ac-c4b0-4d8a-ac87-b12d8b02fa58.jpg?v=1781325751","url":"https:\/\/shop.autorenwelt.de\/en\/products\/bragg-gratings-in-semiconductor-waveguides-von-stephan-pachnicke","provider":"Autorenwelt Shop","version":"1.0","type":"link"}