In this study, we report the results of confirming the possibility of optical fiber temperature sensors by fabricating cholesteric liquid crystal (CLC) cells combined with optical fibers. The CLC cell was fabricated with a Fabry-Perot etalon using the cross-sections of two optical fiber ferrules as substrates. A 1.2 um wide bandwidth wavelength swept laser was used to measure the spectrum change of the CLC cell according to the applied temperature. The reflection spectra were measured by changing the temperature of the CLC cell at intervals of 2o from 23o to 45o, and it was confirmed that the reflection band shifted discontinuously to a shorter wavelength as the temperature increased.
We propose and demonstrate a wide-bandwidth unidirectional ring cavity wavelength-swept laser using a polygonal scanning wavelength filter and two semiconductor optical amplifiers (SOAs). The center wavelengths of the gain media of the two SOAs are 1020 nm and 1140 nm, respectively. At a scanning speed of 1.8 kHz of the WSL, a wide scanning band of about 223 nm with a 10-dB bandwidth from 959 nm to 1182 nm and an average optical power of 58.28 mW were obtained. It can be used as a broadband optical source for dynamic optical fiber sensor or optical coherence tomography.
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