Dual wavelength generation and wavelength tunability in Yb-doped mode-locked laser using few-mode fiber as a saturable absorber

Coexistence of noise-like pulse and dark pulse in an Er/Yb co-doped fiber laser

“…As is well known, different soliton operating regimes require specific conditions for their formation, generally leading to the generation of identical soliton types at the two central wavelengths of pulses. This phenomenon has been confirmed in various dual-wavelength fiber lasers, including conventional soliton (CS) [11][12][13] , dissipative soliton (DS) [14] , dissipative soliton resonance (DSR) pulse [18] , and noise-like pulse (NLP) [15] lasers, etc. However, there are relatively few studies on dual-wavelength pulses with the coexistence of diverse pulse patterns, thus arousing increasing research interest.…”

“…Moreover, these lasers can service as an ideal platform to explore rich soliton dynamics. So far, various methods have been proposed to achieve dual-wavelength operation, mainly including intracavity loss control [7] , and the introduction of cascaded fiber Bragg gratings (FBGs) [8,9] or some artificial comb filters into laser cavities [10][11][12][13][14][15][16] . In particular, the incorporation of a comb filter into the cavity has been proven to be an effective solution for suppressing mode competition and achieving stable multiwavelength operation [10] .…”

“…In particular, the incorporation of a comb filter into the cavity has been proven to be an effective solution for suppressing mode competition and achieving stable multiwavelength operation [10] . It can be achieved in different ways, such as the Lyot filter [11] , the Mach-Zehnder interferometer [10] , the Sagnac loop mirror [12,13] , and the grade-index multimode fiber device [14] . In addition, these comb filters can provide great flexibility in adjusting filter bandwidth, central wavelength, and modulation depth [15][16][17] .…”

C- and L-Bands Wavelength-Tunable Mode-Locked Fiber Laser

“…As the tuning characteristics of a laser depend largely on the tunable filter, much effort has been put into building filters with excellent performance to expand the tunable fiber laser. So far, various filtering techniques have been explored, including Lyot filters [20,21], reflection gratings [22,23], fiber optic gratings [24], Sagnac loop filters [11,[25][26][27][28], volume Bragg gratings [29], and intracavity birefringence filtering effects [30,31], etc. Nyushkov B. et al achieved tuning of the output radiation wavelength from 1524 nm to 1602 nm over a range of 78 nm using a reflection diffraction grating [22].…”