Nonlinear fiber based generating device of high-frequency ultrashort optical pulse and working method thereof
A technology of nonlinear optical fiber and generating device, which is applied in nonlinear optics, cladding optical fiber, optical waveguide light guide, etc., can solve the problems of increasing structural complexity and increasing cost, and achieves easy promotion, low cost, and ultra-high speed. Effects of Lighting Problems
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Embodiment 1
[0050] Embodiment 1: see attached figure 2 , with figure 2 It is a model of the experimental structure, and the dual-frequency beat source is obtained by coupling two continuous light lasers with different wavelengths. It is obtained by two lasers, laser 1 and laser 2, respectively, and the frequency interval between laser 1 and laser 2 is 100 GHz. The polarization controller 4 is used to adjust the polarization state of one of the lasers, so that the light of the two lasers has the same polarization state when they are transmitted in the dispersion-shifted fiber 7 after passing through the 3dB coupler 5, so as to enhance the nonlinearity between them effect. The beat frequency light source is amplified by the erbium-doped fiber amplifier 6 (EDFA), and then input into the dispersion-shifted fiber. The high repetition rate ultrashort optical pulse train is output from its output terminal. The nonlinear coefficient of the dispersion-shifted fiber 7 we use is γ=1.7W -1 km ...
Embodiment 2
[0051] Embodiment 2: see attached image 3 , with image 3 is another model of the experimental structure, and the tunable dual-wavelength laser 3 is used to replace the attached figure 2 The two lasers in the laser are used to generate a dual-frequency beat-frequency light source, and the output light pulse repetition frequency can be adjusted. The beat frequency light source is amplified by the erbium-doped fiber amplifier 6 (EDFA), and then input into the high nonlinear fiber 8, and the high repetition frequency ultrashort optical pulse sequence is output from its output port. The nonlinear coefficient of the highly nonlinear fiber 8 we adopt is γ=10.5W -1 km -1 , the dispersion coefficient is β 2 =0.97ps 2 / km. When the frequency interval of the dual-wavelength laser is adjusted to 200 GHz, the output power of the erbium-doped fiber amplifier 6 (EDFA) is adjusted to 83.7 mW at the same time, and the output end obtains an ultrashort optical pulse sequence with a repe...
Embodiment 3
[0052] Embodiment 3: see attached Figure 4 , with Figure 4 It is another model of the experimental structure. The frequency interval of the dual-wavelength laser 3 is 500 GHz. After being amplified by the erbium-ytterbium co-doped fiber amplifier 9, it is input into the photonic crystal fiber 10, and the high repetition rate ultrashort optical pulse sequence is output by it terminal output. The non-linear coefficient of the photonic crystal fiber 10 that we adopt and ignore loss is γ=11W -1 km -1 , the dispersion coefficient is β 2 =0.48ps 2 / km. The output power of the erbium-ytterbium co-doped fiber amplifier 9 is adjusted to 195.5mW, and an optical pulse sequence with a repetition rate of 500GHz and a pulse width of 312fs is obtained at the output end of the photonic crystal fiber 10, as shown in the attached Figure 9 shown.
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