A stable and low costless tunable erbium doped fiber ring laser was proposed and demonstrated. By using the fiber Bragg grating-assisted add-drop filter as a wavelength selector and a wavelength changer at the same time, a stable laser output was obtained with a 4nm tuning range. The power fluctuation, full-width at half maximum and SMSR were measured to be less than 0.50dB, smaller than 0.015nm and better than 55dB in this tuning range.
In the paper, a design scheme of driving circuit and collimating optical system used for 3D (three-dimensional) imaging device has been proposed. The driving circuit based on power MOSFET for high-power pulsed laser diode has the characteristics of short pulse-width and high output current. According to semiconductor laser’s far field divergence characteristic, the aspheric collimation part has been designed by using optical design software ZEMAX. Far field beam tracing and collimation results are simulated. The laser driver’s output current and pulse width are about 144A and 13.9ns respectively. The RMS of divergent angle of simulation in ZEMAX is 0.318mrad and the spot is more uniform.
KEYWORDS: Data acquisition, Field programmable gate arrays, Data conversion, Signal processing, Data transmission, Laser development, Data processing, Radar signal processing, Telecommunications, Control systems
In this paper, a high-speed data acquisition system based on the technology of USB2.0 (Universal Serial Bus) is
designed, in which USB master logic is implemented in an FPGA (Field Programmable Gate Array). Firstly, the
hardware of data acquisition system is discussed, which includes chip selection, data acquisition and transmission circuit
and power conversion circuit. Secondly, the corresponding software including USB firmware program, USB device
driver and application program as well as its modifications have been described. The designed hardware and software
will help to achieve a data acquisition system with the characterstics of high speed and high accuracy, etc.
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