A novel fiber optic gyroscope with low coherence laser as driving light source is designed in this letter, the low coherence laser has higher average wavelength stability and lower relative intensity noise which is achieved by using Gaussian white noise phase modulation to broaden the linewidth of a DFB laser. The scale factor stability of FOG can be effectively improved when applied to FOG research.
As a mature product with high commercialization, the fiber optic gyroscope is susceptible to the influence of environmental factors in actual use, which affects the measurement accuracy. In order to improve the temperature adaptability of the fiber optic gyroscope and improve the efficiency of temperature compensation in the engineering process of the gyroscope, a temperature modeling and compensation method based on a multilayer perceptron is proposed. First, based on the working principle of the fiber optic gyroscope, the mechanism that causes the temperature error of the fiber optic gyroscope is analyzed. Then, based on the neural network model of the multilayer perceptron, the structure design of the temperature compensation model of the fiber optic gyroscope is carried out, and the existing data is used to train the model. Finally, the compensation model was verified by experiments. The results show that the bias stability of the gyro can be improved by 80% after compensation using this model. Although this method requires a lot of calculations in the early stage, after the model parameters are solidified, it has strong adaptability, is easy to implement in engineering, and can effectively improve engineering efficiency.
A full-parameter simulating software is developed for closed loop fiber optic gyroscopes (FOGs), which is a very powerful tool for designing and optimizing a FOG. It is visual for researchers to investigate the photoelectric signal processing at all stages in FOGs. All optical and electrical components in FOG, including light source, coupler, MIOC, PMF coil, photodetector ADC, DAC and digital circuit, are modeled numerically in the software. The analyses of the amplitude effect on the spectrum of the light source, the modulation and feedback signal and the half-wave voltage adjustment using the software verify the power of the software.
A compact all-photonic-crystal-fiber (all-PCF) polarizer based on fused-type mode-selective fiber coupler is proposed theoretically. Around the wavelength of 1550 nm, the injected unpolarized fundamental mode in the solid-core PCF was selectively coupled into one polarization-mode of polarization-maintained photonic crystal fiber (PMPCF) by welldefined fiber cladding reduction, pretapering and fusion. Numerical simulations indicate the polarization direction of the excited polarization-mode depends on the tapered diameters of solid-core PCF and PMPCF. Moreover, the operation bandwidth of the proposed polarizer is more than 400 nm, which can completely cover the bandwidth of the erbiumdoped solid-core PCF amplified spontaneous emission (ASE) light source. The all-PCF polarizer is anticipated to serve as the key element in the PCF optic gyroscope.
Interferometric fiber optic gyroscopes driven by lasers are new hotspots in recent years at home and abroad. Semiconductor lasers are considered to be an alternative to traditional broadband light sources due to their high commercial maturity, good average wavelength stability, and low intensity noise. However, the semiconductor laser is a highly coherent light source with a narrow linewidth. When it is used in an interferometric fiber optic gyroscope, it will reintroduce non-ideal characteristics such as Rayleigh scattering, Kerr effect, polarization cross-coupling and so on, which will affect the accuracy of the gyroscope. The linewidth of the semiconductor laser is widened before use. Based on the OptiSystem simulation platform, the article builds a semiconductor laser linewidth widening model, and analyzes and evaluates several different phase modulation broadening techniques and their effects. It has certain guiding significance for the experimental design and engineering application of semiconductor laser linewidth broadening.
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