In this work, we present the design and analysis of fiber optic interferometric devices for its application in vibration detection, allowing to create an optical system based on interferometric interactions that can vary the sensitivity through external signals e.g., NLPs (noise-like pulses). The simulation of numerical schemes of the fiber optic interferometer using the MATLAB software is presented, which will allow the development of a first prototype of experimental model. Numerical implementations will be performed in MATLAB using Jones matrices to model the behavior of the fiber optic interferometer. This numerical analysis allows to develop a compact experimental model, capable of varying its transmission, sensitivity and FSR (free spectral range), being able to study the interferometric response to external vibrations and modifying the input parameters, such as power, polarization, and operation range. The input characteristics for the interferometric system can be generated by a fiber optic pulsed laser e.g., F8L (figure eight laser), which can vary its output temporarily, spectrally and in polarization. The complete analysis will allow to propose an all-fiber experimental scheme that is compact and portable compared to conventional interferometric arrays, as are works where arrays of hundreds of meters are implemented, based on the study of fiber optic resonators that improves vibration detection system sensitivity. Subsequently, the first tests were performed using MATLAB functions based on pattern recognition, filtering, and amplification of repetitive signals, which will be experimentally tested in the interferometer in a future work. Finally, potential future applications of this work include detection of vibration anomalies in structures and motors, as well as the detection of sound for integration in specialized medical devices to treat hearing problems.
In this work, we present a temporal and spectral study of properties of a pulsed fiber laser in a figure-eight configuration (F8L) through the automatic adjustment of polarization controller plates. The experimental scheme consists of telecom fiber, a double-clad fiber doped with Er/Yb that allows higher power at the laser output, an optical isolator, a saturable absorber, and retarder plates. Automated polarization control system was developed using computer-aided design and additive manufacturing applied to each polarization stage within the fiber laser. The laser operation is automatically adjusted by means of an optical control system, composed of a quarter-wave retarder (QWR) to allow the self-starting operation, while the angles of the QWR, half-wave retarder (HWR), and QWR plates in the polarization controller allows to adjust the temporal duration of the pulses, as well as the spectral width at the laser output. The laser through automated adjustments on retarder plates generates an emission centered at ~1550 nm, with pulse durations between 189.5 ps to 350 ps (spectral widths between 13.4 nm and 53.4 nm), with repetition frequencies of 904 kHz, and it is possible to generate a supercontinuous spectrum of more than 250 nm. The emission obtained corresponds to noise-like pulse operation, which is very useful for the development of applications such as generation of harmonic mode locking pulses, supercontinuum with high flatness, and optical rogue waves, among others. Finally, the proposed study allows showing the advantages of self-adjusting the laser using automated control, with the aim of finding more precisely modes of operation of interest in multivariable systems.
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