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Dispersion effects in high-speed optical networks
Filip, Tomáš ; Šporik, Jan (referee) ; Tejkal, Vladimír (advisor)
This bachelor’s thesis is focusing on optical transmission principal, its transfer mediums and furthermore also with focusing on its advantages and disadvantages. First half of this thesis focuses on adverse influences, which affect signal transmission in optical networks, on dispersion influences, especially on Polarization Mode Dispersion (PMD). Second half of this thesis deals with measuring of properties of optical fibers, largely chromatic and polarization mode dispersion, used methods and its principals. Furthermore, there are mentioned current compensation possibilities. The seventh chapter deals with optical route simulation in OptiSystem and testing chosen compensation methods for bit rate 40Gb/s. In the last chapter there are elaborated results of real optical route measurements for Masaryk University.
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Simulation of Fiber Bragg Gratings for Semiconductor Laser Stabilization
Helán, R. ; Mikel, Břetislav
Fiber Bragg gratings (FBGs) are one of the most enveloping optical devices in telecommunications and sensor systems. Work is aimed to design of FBGs with utilization especially in sensor systems and laser interferometry for semiconductor laser stabilization at wavelength about 760nm. FBG is sampled and described as sandwich structure of dielectric media layers. Then the T-matrix method is applied to calculation of spectral properties of the grating. This method provides design of arbitrary gratings widely used in many optical systems, such as band filters, in-fiber sensors or fiber grating lasers and amplifiers for their unique properties.
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Návrh apodizovaných-chirpovaných vláknových mřížek založený na metodách vrstveného dielektrika a přenosových matic
Helán, R. ; Urban, F. ; Mikel, Břetislav
This paper discusses methods for calculation properties of apodized-chirped fiber Bragg gratings (FBGs). These are one of the most enveloping optical devices in telecommunications and sensor systems. Work is aimed to design of FBGs with utilization especially in sensor systems and laser interferometry for semiconductor laser stabilization at wavelength about 760nm. FBG is described by periodic spatial function of effective mode index, including apodization and chirp profiles. Sampling makes function discrete and each sample represents one layer of dielectric media. The transfer matrix is made for each step. The overall transfer matrix is created by multiplying of these step-matrices. The spectral characteristic and group delay are calculated from overall transfer matrix at the end. This method provides design of arbitrary gratings, which are widely used in many optical systems, such as band filters, in-fiber sensors or fiber grating lasers and amplifiers for their unique properties.
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