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The Q-switched and mode-locked (QML) pulses of an all normal dispersion Yb3+-doped fiber laser (YDFL) using the nonlinear polarization rotation technique with symmetric and asymmetric Q-switched envelopes were investigated. For QML pulses with a symmetric shape, the width of envelope decreases as the pump power increases, achieving a shortest duration of ∼1.4 μs. An alternate QML state of the YDFL...
A multiwavelength linear-cavity laser array for long-distance sensing is designed and experimentally demonstrated. It is a semiconductor optical amplifier (SOA) integrating a $1\times N$ optical switch, formed by a $2\times 2$ fiber loop mirror and fiber Bragg grating (FBG) as cavity ends. We investigate the laser system output characteristics and evaluate the sensor performance for different...
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