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We proposed an efficient frequency degenerate third-order difference frequency generation (TODFG) in the optical microfiber-ring resonator (MRR) systems. The MRR systems offer a twofold advantage: the decrease of the incident seed optical power required for stimulating the TODFG process and changeless phase evolution in each iteration cycle with nonlinear resonance condition satisfied. By using the...
We theoretically study third harmonic and triple photon generation (THG/TPG) in photonic crystal fiber (PCF). 9% THG conversion efficiency and 28 triplets/s generation rate are achievable in the proposed PCF.
We theoretically study one-third harmonic generation (OTHG) in silica-germanate fibers wherein the efficiency, enhanced by pump attenuation, can reach up to 31% conversion in 34-meter-long fiber, which is 5 times that of the lossless OTHG.
A fiber Bragg grating (FBG) sensor demodulation scheme based on a multi-wavelength erbium-doped fiber laser (EDFL) with linear cavity configuration is presented and demonstrated. The scheme is one linear fiber laser cavity with two FBG sensors as its filters. One is for strain sensing, and the other one is for temperature compensation. A power-symmetric nonlinear optical loop mirror (NOLM) is utilized...
A method based on the quantum-behaved particle swarm optimization algorithm is presented to design a bandpass filter of the fibre Bragg gratings. In contrast to the other optimization algorithms such as the genetic algorithm and particle swarm optimization algorithm, this method is simpler and easier to implement. To demonstrate the effectiveness of the QPSO algorithm, we consider a bandpass filter...
The comparison between direct detection and coherent detection for circular polarization shift keying modulation scheme is analyzed for wireless optical communication in turbulence channel. The coherent detection had a better performance than direct detection.
The influence of pump power on the output characteristics of multiwavelength erbium-doped fiber laser is investigated, which employs the symmetrical nonlinear optical loop mirorr (NOLM). The results show that the number and positions in the spectra of multiwavelength oscillations are determined by pump power for a fixed setting of NOLM.
The influence of pump power on the output characteristics of multiwavelength erbium-doped fiber laser, which employs the effect of the intensity-dependent loss induced by a power-symmetric nonlinear optical loop mirror, is investigated. The results of studies show that the multiwavelength output characteristics including the number, the flatness and the spectral region of output wavelength can be...
Objective-type total internal reflection fluorescence technique and Gaussian fit single particle tracking algorithm have been used to study the constrained Brownian motion characteristics of single fluorescent microspheres of 40 nm diameter in real-time. Three-dimensional tracking has been realized from the two-dimensional images by utilizing the exponential decay of the fluorescence intensity excited...
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