We demonstrate an all fiber high-repetition-rate erbium-doped ultrashort laser based on the Ti3C2T
x
-Mxene saturable absorber (SA), and the 56th harmonic mode-locking with a repetition rate of 622.2 MHz, a central wavelength of 1590.7 nm, and a pulse duration of 1.31 ps is achieved. Meanwhile, dual-wavelength mode-locking pulses are also realized, with the central wavelengths of 1575.6, 1587.5 nm. The results of the work indicate that Ti3C2T
x
-Mxene is an outstanding SA for generating ultrashort pulse or modulating the light and the diversity Mxene family can bring new vigor and vitality into advanced photonic devices.
We report a novel graphene oxide derived nanomaterial, carboxyl graphene oxide (GO-COOH) based saturable absorber (SA) for ultra-short pulse generation. Our GO-COOH based SA demonstrates a large modulation depth of 11.4% and a low saturation intensity of 31.12 MW cm−2. The output pulse width is ∼398 fs with a spectral bandwidth of ∼7.45 nm. Stable bound state solitons are also generated with the GO-COOH based SA. Our results show that the GO-COOH is a promising SA for femtosecond pulse generation.
Inspired by recent advancements of graphene-based ultrafast photonic devices, as a graphene-like two-dimensional layer-structure material, Ti3C2Tx-MXene has gained much interest in nonlinear optical applications, especially in all-optical intensity modulation. Herein, we successfully fabricated an all-optical modulator based on Ti3C2Tx-Mxene/polyvinyl-alcohol film with nanosecond-scale response time, modulation speed of 100 kHz, and modulation depth of 10%. Furthermore, the variation of fall edges of modulated signal pulse attributing to thermo-optic effect under different pump power was also observed. Considering the ease of fabrication, low cost, ease integration, the proposed novel modulator may open the door for highspeed all-optical communications and signal processing.
An all-optical modulator of reduced graphene oxide coated D-shaped fiber structure, utilizing a convenient and controllable evanescent-field-induced deposition method, was designed in this study. By using the pump pulse at 980 nm, the signal light at 1550 nm was modulated with the rate of 50 kHz, and the maximum modulation depth of 8 dB was obtained using this device. Furthermore, this kind of modulator features strong mechanical stability, ease of fabrication, low cost and compatibility with optical fiber systems, which implies great potential in photonics applications such as all-optical switching and all-optical communication.
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