We propose a simulation scheme for cascaded four-wave mixing communication transmission characterization in the mid-infrared band. Simulations are performed using OptiSystem software. Signal light and pump light with wavelengths of 2052 and 2050 nm, respectively, passed through a highly nonlinear fiber, and significant cascade four-wave mixing phenomenon occurred, and the signal loaded on the signal light was successfully transmitted to the idler light generated by the cascade four-wave mixing effect. The performance of the signals carried in each idler light in both fiber and free-space channel was tested by eye diagrams and BER tests. At a pump power of 24 dBm, eight optical carriers were obtained the could meet the communication requirements, realizing a total transmission rate of 80 Gb/s. This is the first time that a simulation analysis of cascaded FWM multicast in the 2 μm band has been reported. The research results can promote the development of optical communication technology in the mid-infrared band and provide a reference for the establishment of high-speed multiplexing systems.
In the last few years, all-optical signal processing based on 2D materials has been a hot topic because of its ultra-fast optical response, broadband optical absorption, and tunable optoelectronic characteristics. However, there are few reports about all-optical wavelength conversion concentrate on the 2μm communication band in the existing research for the limits of small nonlinear coefficient, serious linear and nonlinear loss, or small conversion bandwidth. In our work, four-wave mixing in the 2μm band is realized by fabricating graphene modified micro/nano optical fiber devices, which can achieve the -46.21dB wavelength conversion efficiency. This work will contribute to the practical application of 2μm band wavelength conversion.
The dissipative soliton resonance (DSR) pulses are demonstrated experimentally in an all polarization-maintaining (PM) thulium-doped mode-locked fiber laser. The mode-locked operation is achieved using of the nonlinear amplifying loop mirror mechanism (NALM). Each loop of the apparatus includes an independently controlled amplifier and a section of gain fiber. The experiment is carried out at a central wavelength of 1969.8 nm and 3.5 ns as the maximum output pulse width. The time domain and spectrum characteristics of output pulse are analyzed with different positions of PM-1950 fiber in the NALM loop. In addition, the DSR pulse properties are experimentally verified by changing the length of the PM-1950 fiber spliced into the NALM loop. We have achieved environmentally stable mode-locked pulses at 3, 2.1, and 1.62 MHz corresponding to the maximum pulse energies of 6.8, 20, and 29.1 nJ. The output pulse is stable and robust at different ambient temperatures.
We present the generation and optimization of square-wave noise-like pulses (NLPs) in a mode-locked Tm-doped fiber laser. Mode-locking operation around the 2-μm band is achieved by a nonlinear amplifying loop mirror. To optimize the output performance, the figure-eight cavity is modified by employing a polarization-dependent isolator in a unidirectional loop, and the cavity length is only 17.2 m. First, by employing a cavity with pure anomalous dispersion, a conventional soliton can evolve into a square-wave NLP by properly setting the pump power and polarization controllers. The pulse energy of the fundamental-frequency operation can be varied from 2.29 to 3.4 nJ. Using an ultrahigh-numerical-aperture fiber to reduce the net dispersion to −1.033 ps2, the 3-dB bandwidth of the spectrum is broadened to 14.78 nm, and the duration of the autocorrelation spike is only 421 fs. The maximum single-pulse energy can increase up to 4.97 nJ. Due to dispersion management mechanism, the threshold and output power are also significantly improved.
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