|
|
Programmable attenuator for laboratory measurement
Husslik, Tomáš ; Šimka, Marek (referee) ; Polák, Ladislav (advisor)
This thesis deals with the design of a programmable attenuator with digital control. The main objective of the work is to design and create an attenuator with a nominal impedance of 50 , providing adjustable attenuation in the range of 0 to 40 dB, functioning within a bandwidth of 1 to 2 500 MHz. Control of the proposed attenuator is facilitated by a microcontroller that manages the settings of an integrated circuit attenuator. Furthermore, the attenuator features a basic user interface. A PCB was designed for the attenuator and subsequently manufactured. The device was then assembled and its key parameters were measured.
|
|
|
Analysis and construction of an optical fibre tunable attenuator for telecommunication applications
Prokop, Daniel ; Eliáš, Josef (referee) ; Urban, František (advisor)
This paper deals with the possibilities of designing the module for control of the attenuation of the optical signal. The paper describes basics of ber optic transmission and beam e ects. Variants of attenuation cells are characterized in this paper and based on the ndings a solution of the module for control of the attenuation of the optical signal is proposed. Practical section of the thesis deals with the design and physical construction of module for control of the attenuation of the optical signal using MEMS variable optical attenuator.
|
|
|
Input Circuits for Bi-Amp Loudspeaker System
Hanák, Filip ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
The work focuses on the design input circuits for active speaker system. There is described the theory design input circuits such as attenuator pads, low pass filter, preamplifier, Baxandall tone control and S / PDIF. Based on the theory described are selected optimal designs and their subsequent draft. Complex design of the input circuit for loudspeaker system is designed to achieve a low acoustic distortion sound.
|
|
|
Optical amplifier in laboratory practice
Šustr, Pavel ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of this thesis is to introduce to reader the application and use of optical EDFA amplifiers in optical transmission and to show wiring and practical test, including measurements on amplifier. The aim of this thesis is to propose the use of optical amplifier in laboratory practice for subject Optical networks. The thesis briefly introduces the problems of data transmissions through optical fibers with a focus on the use of optical amplifiers. The basic characteristic of optical transmission paths and the reasons for the use of optical amplifiers are described here. One entire chapter is devoted to distinction of optical amplifiers. Amplifiers can be divided according to location in the transmission path to the booster, in-line and pre-amplifiers and according to the used of amplifying technology to optical amplifiers with subsidies, semiconductor optical amplifiers and Raman optical amplifiers. The factors affecting the efficiency of optical amplifiers, such as noise and the level of saturated power are mentioned here too. The different types of optical amplifiers from the two producers are also described. From these amplifiers was chosen EDFA CzechLight Amplifier from Optokon to be used for the laboratory exercise in the subject of Optical networks. The use of EDFA optical amplifiers in optical transmission lines is mentioned here too. These amplifiers can be used in telecommunications transmission systems and for data transmission over long distances. They will find use in WDM transmission systems and cable TV distribution through the optical fiber to the end users. Practical measurements were performed on optical amplifier CLA-PB01F. In the transmission route was located attenuator and the dependence of output power to input signal power was measured. The amplification course was linear in the range of input values provided by the manufacturer. Laboratory exercise for the subject of Optical networks is aimed at preacquaintance of students with problems EDFA optical amplifiers and practical measurements with the optical amplifier CLA-PB01F. Students acquire basic theoretical knowledge of the issue and verify the functionality of optical amplifiers on a specific exercise. This work is destined for all who wish to get basic knowledge of optical amplifiers, their characteristics and possibilities of their use in optical transmission lines.
|
|
|
Analysis and construction of an optical fibre tunable attenuator for telecommunication applications
Prokop, Daniel ; Eliáš, Josef (referee) ; Urban, František (advisor)
This paper deals with the possibilities of designing the module for control of the attenuation of the optical signal. The paper describes basics of ber optic transmission and beam e ects. Variants of attenuation cells are characterized in this paper and based on the ndings a solution of the module for control of the attenuation of the optical signal is proposed. Practical section of the thesis deals with the design and physical construction of module for control of the attenuation of the optical signal using MEMS variable optical attenuator.
|
|
|
Input Circuits for Bi-Amp Loudspeaker System
Hanák, Filip ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
The work focuses on the design input circuits for active speaker system. There is described the theory design input circuits such as attenuator pads, low pass filter, preamplifier, Baxandall tone control and S / PDIF. Based on the theory described are selected optimal designs and their subsequent draft. Complex design of the input circuit for loudspeaker system is designed to achieve a low acoustic distortion sound.
|
|
|
Optical amplifier in laboratory practice
Šustr, Pavel ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of this thesis is to introduce to reader the application and use of optical EDFA amplifiers in optical transmission and to show wiring and practical test, including measurements on amplifier. The aim of this thesis is to propose the use of optical amplifier in laboratory practice for subject Optical networks. The thesis briefly introduces the problems of data transmissions through optical fibers with a focus on the use of optical amplifiers. The basic characteristic of optical transmission paths and the reasons for the use of optical amplifiers are described here. One entire chapter is devoted to distinction of optical amplifiers. Amplifiers can be divided according to location in the transmission path to the booster, in-line and pre-amplifiers and according to the used of amplifying technology to optical amplifiers with subsidies, semiconductor optical amplifiers and Raman optical amplifiers. The factors affecting the efficiency of optical amplifiers, such as noise and the level of saturated power are mentioned here too. The different types of optical amplifiers from the two producers are also described. From these amplifiers was chosen EDFA CzechLight Amplifier from Optokon to be used for the laboratory exercise in the subject of Optical networks. The use of EDFA optical amplifiers in optical transmission lines is mentioned here too. These amplifiers can be used in telecommunications transmission systems and for data transmission over long distances. They will find use in WDM transmission systems and cable TV distribution through the optical fiber to the end users. Practical measurements were performed on optical amplifier CLA-PB01F. In the transmission route was located attenuator and the dependence of output power to input signal power was measured. The amplification course was linear in the range of input values provided by the manufacturer. Laboratory exercise for the subject of Optical networks is aimed at preacquaintance of students with problems EDFA optical amplifiers and practical measurements with the optical amplifier CLA-PB01F. Students acquire basic theoretical knowledge of the issue and verify the functionality of optical amplifiers on a specific exercise. This work is destined for all who wish to get basic knowledge of optical amplifiers, their characteristics and possibilities of their use in optical transmission lines.
|
guest ::
