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Long optical fibre routes influence on the polarizing state of light and uses it for powering polarization sensors
Panascí, Marco ; Grenar, David (referee) ; Filka, Miloslav (advisor)
This diploma thesis deals with the influence of long fiber optic paths on the polarization state of light and their use for powering polarization sensors. The aim of the diploma thesis was to design the arrangement of optical fiber components so that the polarization properties of light at the end of the path are further usable for sensory purposes. Four partial measurements with a long path (in a laboratory setting, laying in the ground, on a curtain, under the influence of external influence) and one measurement without a path under the influence of external influence were designed. The overall measurement results demonstrate that for the functional power supply of long-distance sensor systems, an existing single-mode fiber can be used (laid by laying in the ground), into which a light source for a given sensor system would be multiplexed. In the discussion, all types of measurements are analyzed and compared with each other. Finally, the overall result is summarized and applications are described in which such a sensor system could be used.
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Laser Diode Controller with Analog Modulation
Král, Vojtěch ; Dobesch, Aleš (referee) ; Barcík, Peter (advisor)
The Bachelor thesis deals with a design of the controller for a laser diode with the possibility of analog modulation. The basic parameters (current, voltage, temperature and optical power) are shown on an alphanumeric LCD display with the driver SPLC780. Core of this project is the laser driver MLD203CHB. Control is realized by buttons, which are setting the value of digital potenciometre, which is connected to the reference. Everything is controlled by the microcontroller ATMGEA328P. Temperature is measured with the analog sensor TMP36. Cooling of the laser diode is implemented by a peltier module controlled by the microcontroller.
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Laser diodes controller utilizing AVR microcontroller
Boštík, Jiří ; Šilhavý, Pavel (referee) ; Krajsa, Ondřej (advisor)
This thesis deals with the design and subsequent realization of laser diode control devices. The circuit will be able to control the diode with using a laser driver, via a computer network or via the display for control current values, setting of initial values and more. The device will be connected also with a SD card for saving of settings. In the theoretical part there are described individual components that are needed for functionality of the device. The practical part contains a block diagram, in which is described complete feature of the device, then a draft scheme with a description of all integrated circuits and important components. At the end of this work is described the software that controls the entire designed device.
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Pulsed driver for laser diodes
Pernica, Lukáš ; Křepelka, Pavel (referee) ; Drexler, Petr (advisor)
This semestral thesis describes creation of laser radiation in the semiconductor material, the structure of the laser diode and the possibility of using power laser diodes in pulsed mode with high switching frequencies. In the thesis are described methods of casing of power laser diodes and their cooling possibilities and solutions to their switching, evaluating the pros and cons of these solutions and select the most suitable one for the best completion of all requirements.
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Realization of the optical source with superluminescent diode
Juráň, Jakub ; Levek, Vladimír (referee) ; Čožík, Ondřej (advisor)
This bachelor’s thesis describes design of the optical source with superluminiscent or laser diode. Firstly, the problems of optical sources in the form of laser diodes (coherent light sources) are analyzed. The thesis contains a description of the realization of circuit that includes blocks of temperature and current flow control, block of the power management and the control block. The electrical circuit is divided into the functional modules, their functionality is explained in details. It also includes description of the software designated for controlling of the circuit’s functions.
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Converter with very low input voltage
Jaško, Michal ; Beneš, Petr (referee) ; Havránek, Zdeněk (advisor)
This Bachelor’s thesis describes a design and testing of an increasing direct voltage converter transforming light energy received by a photodiode to electrical energy with sufficient output voltage to power digital circuits. The theoretical part forms an overview of commercial circuits and the Linear Technology LTC3109 and the combination of Seiko S-822Z20 and S-8353D30MC are chosen as suitable for the further research. The function principles of these circuits are described. In the practical part the maximum output power and efficiency dependences on the internal resistance of the power source of the circuits are measured. Based on the results the characteristics of the Linear Technology circuit with different variants of the input transformers are compared. A modified Seiko circuit with an input photodiode is designed and its function is verified by laser diode powering through an optical fiber.
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Workplace for testing of the laser diodes
Zemánek, Martin ; Tannenberg, Milan (referee) ; Wilfert, Otakar (advisor)
Bachelor thesis is focused on laser diodes and proposal in their workplace testing, followed by constructing workplace with program for graphical output with processed values of measurment. Laser diodes paramaters as optical power, symmetry of the laser beam and radiation characteristic are the objective of this thesis. Thesis includes the theory of laser diodes, device list, workplace layout, description of measurment methods, followed by measuring and and processing the values in program with graphical output. Resulting values are compared with catalog data.
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Laser diode driver
Pučálka, Jan ; Látal, Jan (referee) ; Diblík, Jan (advisor)
The thesis describes the function and an energizer fount design for a laser diode.The main aim was to be familiarized with the requirements for the laser diode construction and to realize the equipment which enables an intensive modulation of a radiated cluster accompanied with a dynamics at least 80% of a maximum radiated output. The introduction of the thesis is focused on the issue of the primary features and elementary ideas concerning the matter of the laser. Moreover the types, infiltration application and the essential laser diode wiring are defined.The conclusion of the thesis is concentrated on the energizer fount linkage for the laser diode.
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Design of stabilized optical source
Novák, Michal ; Chmelař, Milan (referee) ; Filka, Miloslav (advisor)
The aim was to design a stabilized optical light source operating at a wavelength of 1 625nm, suitable for measuring the attenuation of optical fiber transmission method. Source should be stabilized by optical feedback and output should be washed 0dB, 5 db and 10 db. There have been described in various peripheral components such as LEDs and laser diodes, the method of dividing the optical signal and its measurement of a PIN photodiode and avalanche photodiode. Furthermore, optical attenuator, which in this design has played an important role. With it's optical power is stabilized. They were also briefly described three basic methods of measuring attenuation of optical lines. Proposal for construction has been described switched power supply that provides voltage and current surge into the laser diode and the voltage stabilizer is used to power optical attenuator. The work also solved the optical attenuator control voltage output current from the photodiode.
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