Beating Frequency Tunable Dual-Wavelength Erbium-Doped Fiber Laser With One Fiber Bragg Grating

Single- and dual-wavelength switchable erbium-doped fiber ring laser based on intracavity polarization selective tilted fiber gratings

“…From these two figures we can see that the optical signal to noise ratio (OSNR) is more than 65dB and the side mode suppression ratio (SMSR) is larger than 50dB for both laser lines. These two values are higher than that of the EDFLs reported in references [8][9][10]. The higher OSNR and SMSR are mainly attributed to the ASE suppression function of the 45°-TFG and the low reflectivities of the two seeding FBGs, respectively.…”

“…The two TFGs include one with the structure tilted at 45º, which is used as an in-fiber polarizer [11] and the other at 77º as a polarization dependent loss filter. The optical signal to noise ratio of >60dB has been obtained in such an EDFL system, which is higher than that in the previous reports [8][9][10]. In this configuration, the separation between the switchable wavelengths can be more flexibly designed with potential tuning capability.…”

“…Special laser cavity configurations for multi-wavelength operation by incorporating a segment of highly nonlinear photonic crystal fiber or dispersion-shifted fiber have also been reported [5][6][7]. In recent years, multi-wavelength fiber lasers operating at room temperature by utilizing polarization hole burning (PHB) effect from polarization maintaining (PM) FBGs have been studied extensively and various setups have been demonstrated [8][9][10].…”

Single linearly polarized, widely and freely tunable two wavelengths -doped fiber laser

“…In our proposed fiber laser configuration (all components inside laser cavity are PM fiber including the gain medium), the PHB plays a much more important role for the stable tunable two wavelengths oscillating simultaneously with equal amplitudes which has been demonstrated in this work. Lasers operating on different linearly polarized polarizations (two different wavelengths) greatly enhance the PHB in the linear fiber laser cavity and reduce the homogeneous linewidth of the PM Y 3þ b -doped fiber like other works reported in Erbium-doped fiber [17]. Due to the much enhanced PHB by the total reflection of the two tunable bulk blaze grating combining with the gain saturation, the Y 3þ b -doped fiber laser can be operated in stable tunable dual-wavelength with single linear polarization and good polarization extinction ratio in principle.…”

Switchable dual-wavelength erbium-doped fiber-ring laser based on one polarization maintaining fiber Bragg grating in a Sagnac loop interferometer

“…Thus it is difficult to obtain simultaneous multi-wavelength lasing in EDF lasers. FBGs written in polarization-maintaining fiber have recently attracted considerable research attention [6][7][8][9][10][11]. Zhao et al [7] realized switchable dual-wavelength EDF-ring lasers using a FBG in high-birefringence fiber.…”