Fig. 1. The first linearly polarized supercontinuum fiber source^[22]. (a) Output spectrum of supercontinuum; (b) dispersion and group delay curves of the fiber; (c) effect of pumping wavelength on supercontinuum; (d) effect of polarization direction of pumping light on supercontinuum; (e) effect of pulse width of pumping light on supercontinuum

Fig. 2. Linearly polarized supercontinuum generated in high birefringence photonic crystal fiber^[23]. (a) Cross section of the high birefringence photonic crystal fiber; (b) output spectrum

Fig. 3. Linearly polarized supercontinuum generated in V-type photonic crystal fiber with high birefringence^[24]. (a) Cross section of V-type photonic crystal fiber; (b) dispersion curves of two fundamental modes; (c) output spectra at different pump power

Fig. 4. Linearly polarized supercontinuum generated in elliptical core photonic crystal fiber with submicron air holes^[25]. (a) Cross section of the fiber; (b) dispersion curve; (c) spectra at different pump power

Fig. 5. All-fiber structure linearly polarized supercontinuum with high coherence^[26]. (a) Cross section of the fiber; (b) structure of fiber core region; (c) spectra (the black curve is the experimental measured curve, the green curve is the theoretical calculated curve, and the red and gray curves represent the supercontinuum stability by dispersion Fourier transform technology); (d) measured pulse-to-pulse interference and calculated fringes visibility

Fig. 6. Ultra-fast and low noise linearly polarized supercontinuum^[28]. (a) Experimental structure; (b) output spectra

Fig. 7. All-fiber structure linearly polarized supercontinuum with high power^[27]. (a) Cross section and dispersion curve of polarization-maintaining photonic crystal fiber; (b) spectra of linearly polarized supercontinuum

Fig. 8. Linearly polarized supercontinuum generated in polarization maintaining fiber amplifier^[29]. (a) Experimental structure; (b) output spectra

Fig. 9. Linearly polarized supercontinuum generated in polarization-maintaining random fiber laser^[30]. (a) Experimental structure; (b) output spectra

Fig. 10. Linearly polarized supercontinuum generated in polarization maintaining erbium-doped fiber amplifier^[31]. (a) Experimental structure; (b) spectra at different pump power

Fig. 11. Linearly polarized supercontinuum generated from ZBLAN fiber^[32]. (a) Experimental structure; (b) spectrum of linearly polarized supercontinuum

Fig. 12. Linearly polarized supercontinuum generated from chalcogenide fiber^[35]

Fig. 13. Measurement of polarization extinction ratio of high-power linearly polarized fiber lasers by the method of rotating polarizer

Fig. 14. Polarization extinction ratio measurement method based on polarization phase filtering principle

Fig. 15. Polarization extinction ratio measurement results at different wavelength ranges^[27]. (a) 900-1600 nm; (b) 520-650 nm

Fig. 16. Schematic of polarization extinction ratio measurement method based on spectral subtraction calculation

Fig. 17. Linearly polarized supercontinuum with ^{high power. (a) Output spectra at maximum, minimum, and total power; (b) PER measurement result}

Fig. 18. Fast axis and slow axis spectra of polarization maintaining photonic crystal fibers, the polarization extinction ratio is 17 dB^[28]

Fig. 19. Output spectra for different polarizer orientation while pumping at 45° from the two axes