An Easily Switchable Dual-Wavelength Passively Mode-Locked Erbium Fiber Laser

Abstract

A simple scheme of switchable dual-wavelength passively mode-locked fiber laser is demonstrated. The laser can be flexibly switched among different mode-locked states simply by tuning the cavity loss while keeping all the other cavity parameters fixed. As the cavity loss increases, the mode-locked fiber laser operates at the long-wavelength, dual-wavelength, and short-wavelength states, successively. In addition, these states can be conveniently switched without losing the mode-locked operation and the switching process is reversible as the cavity loss decreases. The mechanism is qualitatively explained by the balance between the fiber gain and the cavity loss.

Analysis of Bound-Soliton States in a Dual-Wavelength Mode-Locked Fiber Laser Based on Bi2Se 3

“…The multi-pieces of Bi 2 Se 3 -PVA film is likely to lead to the appropriate cavity loss, which can equilibrate effective gain for two wavelengths in the fiber laser since the operation wavelengths are strongly dependent on the intracavity loss [2,5]. Under the pump power of about 155 mW, the coexistence of single-pulse at 1532 nm and bound state pulses at 1557 nm was obtained by carefully adjusting the PC state.…”

“…It has been demonstrated experimentally that the passive mode-locking technique is an effective way to achieve multi-wavelength mode-locked fiber lasers, including artificial saturable absorbers (SAs, such as nonlinear polarization rotation [1,2], nonlinear optical loop mirror [3]) and real SAs (e.g., semiconductor Fabry-Perot saturable absorber mirrors [4], carbon nanotubes [5], graphene [6], graphene oxide [7], and topological insulators(TIs) [8]). Owing to fiber inherent birefringence, the mechanism of wavelength-selection is automatically implemented without additional components [9][10][11].…”

“…Therefore, passively mode-locked fiber lasers become an ideal test-bed for the investigation on the formation and characteristics of the multi-wavelength soliton pulses. So far, various multi-wavelength mode-locking operation, such as tunable and switchable multi-wavelength dissipative solitons [12][13][14], dual-wavelength conventional solitons [2], multi-wavelength conventional solitons [15,16], multi-wavelength noise-like square-pulses [17], dual-wavelength harmonic mode locking pulses [18], and dual-wavelength bound-state solitons [5], have been observed in fiber lasers. However there are many interesting soliton interactions [19,20] have not been reported in multi-wavelength passively mode-locked fiber lasers.…”

Synchronised dual-wavelength mode-locking in waveguide lasers

“…Experimental observations of dual-wavelength mode locking have been reported by Zhao 12 and Huang 13 , with 1530 nm and 1555 nm simultaneously mode-locked with two separate pulse trains and switching between the two wavelengths were realised by changing pump power and cavity loss. Similar dual wavelength mode locking behaviors can also be observed under a variety of conditions 14 – 16 .…”

Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium–Ytterbium Co-Doped Fiber Laser

“…[6,7] There are many works on dual-wavelength fiber laser, which are mainly based on erbium-and thulium-doped fiber. [8,9] In this Letter, a room-temperature all-fiber dual-wavelength holmium-doped fiber laser (HDFL) operating in 2 µm region is demonstrated for the first time by using a newly developed holmium-doped fiber (HDF) as a gain medium.…”