We proposed and demonstrated a high-efficiency Brillouin random fiber laser (BRFL) in a half-open linear random cavity incorporating with a self-inscribed dynamic fiber grating (DFG) for laser frequency stabilization. The DFG can be produced when the ion population distribution along erbium-doped fibers is periodically modulated by two coherent counter-propagating standing waves via the spatial hole-burning effect. Consequently, a BRFL with the linear half-open-cavity exhibited an optimized laser efficiency while the embedded DFG effectively purified the random modes and suppress the frequency drift caused by multiple random mode hopping. With a low laser threshold of 13.9 mW, the laser efficiency of up to 19.3% was observed, which is four times higher than that of the BRFL with a half-open ring cavity. It suggests that the proposed BRFLs could be beneficial to practical applications in fiber-optic sensing and coherent communication
An in-line Mach-Zehnder interferometer(MZI) sensor was proposed and experimentally demonstrated for simultaneously measuring transverse pressure and temperature. The MZI is fabricated by simply splicing the two ends of a segment multicore fiber (MCF) with two short sections of multimode fibers (MMFs) using a commercial fusion splicer. The transverse pressure and temperature characteristics of the sensor have been investigated in experiment. The results show that the transmission spectra shift when the external transverse pressure and temperature variation, and different spectral responses of the resonant dips are observed, which indicates that the sensor can realize simultaneous transverse pressure and temperature measurement by monitoring the wavelength changes of two resonant dips. The obtained sensitivities can reach up to 112pm/N and 43pmm/°C, respectively.The proposed sensor has the potential application in the fields where both temperature and transverse pressure measurments are required
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