A multi-wavelength erbium-doped fiber laser with switchable output wavelength and tunable wavelength interval is designed and realized. The ring cavity structure is adopted. There are two independent sub-cavities in the ring cavity. One sub-cavity uses FBG-Sagnac ring filter as the frequency selection element, and the other sub-cavity uses fiber Bragg grating (FBG) as the frequency selection element. The performance of the FBG-Sagnac loop filter is analyzed by transmission matrix method and MATLAB simulation, and a dual-path erbium-doped fiber laser is built. At room temperature, by changing the state of optical attenuator and polarization controller, single, double and three wavelength outputs are obtained. In the mode of outputting a wavelength, the laser can realize free switching among the output wavelength of 1550.0 nm, 1550.8 nm and 1551.6 nm. In the mode of dual wavelength output, the output wavelength interval can be switched between 0.8 nm and 1.6 nm. In the mode of outputting three wavelengths, the wavelength interval of the output laser is 0.8 nm, it can be realized to meet the requirements of wavelength division multiplexing. In the stability test, the experimental results show that the laser has good stability.
At present, the domestic medical puncture robot is still in the research stage. To meet the need of accurate sensing of puncture force in the surgical process, this paper design and manufacture a high-sensitivity optical fiber puncture force sensor with the advantages of small size, high accuracy, anti-electromagnetic interference and good biological compatibility. In this paper, an extrinsic Fabry-Perot sensor is fabricated using the single mode optical fiber and the capillary tube by the method of arc discharge welding. The sensor is encapsulated in a steel needle to make a probe that can measure the puncture force. The calibration for the sensor is carried out. The experimental results show that the sensor has a measuring range of 0-17 N, a sensitivity of 20.66 nm/N, a resolution of 0.01N and a good linearity. The sensor has the advantages of simple manufacturing process and high sensitivity, which makes it have a good application potential in the field of medical puncture robot.
Owing to the advantages of a wide transparency window (over 20 μm), a high optical nonlinearity (up to a thousand times greater than that of silica fibers), and strong confinement and dispersion engineering achievable, chalcogenide photonic crystal fibers (PCFs) are the best candidates for mid-infrared (mid-IR) supercontinuum generation (SCG). In this review, we introduce the background and the basic theory of the SCG firstly before describing several kinds of fabrication methods of the chalcogenide PCFs. Then, recent progress in the chalcogenide PCFs based mid-IR SCG are present.
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