Tunable and switchable dual-wavelength passively mode-locked Bi-doped all-fiber ring laser based on nonlinear polarization rotation

Abstract

We demonstrate a tunable and switchable dualwavelength passively mode-locked Bi-doped all-fiber ring laser by using nonlinear polarization rotation (NPR) technique. Exploiting the spectral filtering effect caused by the combination of the polarizer and intracavity birefringence, the wavelength separation of dual-wavelength mode-locked pulses can be flexibly tuned between 2.38 and 20.45 nm. Taking the advantage of NPR-induced intensity-dependent loss to suppress the mode competition, the stable dual-wavelength pulses output is obtained at room temperature. Moreover, the dual-wavelength switchable operation is achieved by simply rotating the polarization controllers (PCs).

Wavelength and bandwidth tunable passively mode-locked fiber laser based on semiconductor saturable absorber mirror and liquid crystal on silicon device

“…Compared to conventional mode-locked lasers, a tunable-mode-locked laser with flexibly adjustable mode-locked laser parameters, such as output wavelength, pulse repetition frequency, and pulse width, obviously has a wider application potential [4][5][6][7][8]. Graphene and other two-dimensional (2D) noncarbon materials, including topological insulators (TIs), transition metal dichalcogenides (TMDCs), phosphorene, bismuthene, and antimonene, have witnessed a very fast development of both fundamental and practical aspects in mode-locked fiber lasers [9].Several approaches have been proposed to achieve tunable wavelength mode-locked operation, based on a nonlinear optical loop mirror (NOLM) [10] or on polarization-maintaining fiber (PMF) [11].…”

Tunable filter based on a pair of special long-period fiber gratings and its application in fiber ring laser

“…The maximum tunable ranges for two orthogonal polarization laser beams are 81.5 and 82.5 nm, respectively. By using nonlinear polarization rotation technique, a tunable and switch able dual wavelength passively mode locked Bi doped all fiber ring laser was demonstrated [13]. And the wavelength separation of dual wavelength mode locked pulses can be tuned between 2.38 and 20.45 nm.…”

Tunable laser generation with erbium-doped microfiber knot resonator

“…Recently, single frequency Erbium doped fiber lasers (EDFLs) have been shown to be capable of providing mode hop free lasers in the form of distributed feed back (DFB), distributed Bragg reflector (DBR) and ring lasers [8][9][10][11][12][13][14][15]. Many works have also been reported on Q switched and mode locked fiber lasers [16][17][18]. The advantage of fiber lasers is their narrow linewidth (kilohertz range), wavelength tenability, sta bility and direct compatibility with fibre networks.…”