Tunable and switchable triple-wavelength ytterbium-doped fiber ring laser based on Sagnac interferometer with a polarization-maintaining photonic crystal fiber

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

“…Fiber gratings are not the optimal choice due to their high production cost, complicated production process, and insufficient sensitivity, which makes it difficult to monitor changes in the number of parameters. Many researchers chose to use SI in the measurement of multiple parameters [28][29][30][31]. In the Sagnac loop, a fixed-length polarization maintaining fiber (PMF) with a fixed birefringence coefficient is sandwiched between two SMFs.…”

Pump-controlled wavelength switchable dissipative soliton mode-locked Yb-doped fiber laser using a 45° tilted fiber grating

“…Due to the demand for strong spectral filtering effects [6], the optical filters including Mach-Zehnder interferometer (MZI) [7][8][9], Fabry-Perot interferometer (FPI) [9][10], chirped fiber gratings [11], Sagnac loop filter [12][13] and fiber-based birefringent filter [14], have become the priority for the achievement of wavelength switching in YDFL. Among them, the fiber-based birefringent filter is highly J o u r n a l P r e -p r o o f appreciable in wavelength switchable lasers due to its simple structure and flexibility without adding complexity to the laser cavity.…”