Tunable dual-wavelength all-PM fiber ring laser

Dual wavelength continuous wave laser using a birefringent filter

“…This setup is simple to align and has minimum cavity elements. It avoids the use of multiple trajectories or external active elements as reported in other dual wavelength systems [10]- [17].…”

Switchable and tunable dual-wavelength erbium-doped fiber laser based on one fiber Bragg grating

“…Some of the systems mentioned above allow control of the wavelengths, but they require a different FBG for each wavelength and the spacing is somewhat large. Stable multi-wavelength operation of EDFLs with tunable wavelength spacing has also been achieved using other technologies such as a segmented all-PM fiber ring resonator [12], a spacing-tunable multi-wavelength comb filter [13], second-order nonlinearity of LiNbO 3 waveguides [14], or chirped FBGs [15], however, these configurations are complicated, or require the use of liquid nitrogen [13], which makes it impractical.…”

Temperature-sensitive dual-segment polarization maintaining fiber Sagnac loop mirror

“…The spectral spacing can be selected by adjusting the polarization state of the light beam inside the loop. This is normally done using a PC [6][7][8][9]. Besides the mechanical control by the PC, some literatures also reported on optically [10,11] and thermally [12] controlled FLM.…”